ILGenerator.EmitWriteLine Méthode

  • Référence

Définition

Espace de noms:
System.Reflection.Emit
Assembly:
System.Reflection.Emit.ILGeneration.dll
Assembly:
mscorlib.dll
Assembly:
netstandard.dll
Paquet:
System.Reflection.Emit.ILGeneration v4.7.0

Fonctions d'assistance pour émettre un appel à WriteLine() avec différents types de valeurs.

Surcharges

EmitWriteLine(String)

Émet le code MSIL (Microsoft Intermediate Language) pour appeler WriteLine avec une chaîne.
EmitWriteLine(FieldInfo)

Émet le code MSIL (Microsoft Intermediate Language) nécessaire pour appeler WriteLine avec le champ donné.
EmitWriteLine(LocalBuilder)

Émet le langage MSIL nécessaire pour appeler WriteLine avec la variable locale donnée.

EmitWriteLine(String)

Source:
ILGenerator.cs
Source:
ILGenerator.cs
Source:
ILGenerator.cs

Émet le code MSIL (Microsoft Intermediate Language) pour appeler WriteLine avec une chaîne.

public:
 virtual void EmitWriteLine(System::String ^ value);
public virtual void EmitWriteLine (string value);
abstract member EmitWriteLine : string -> unit
override this.EmitWriteLine : string -> unit
Public Overridable Sub EmitWriteLine (value As String)

Paramètres

value
String

Chaîne à imprimer.

Exemples

L’exemple de code ci-dessous illustre l’utilisation contextuelle de la EmitWriteLine méthode pour écrire une chaîne dans la console dans une méthode dynamique.

using namespace System;
using namespace System::Threading;
using namespace System::Reflection;
using namespace System::Reflection::Emit;
Type^ CreateDynamicType()
{
   array<Type^>^ctorParams = {int::typeid,int::typeid};
   AppDomain^ myDomain = Thread::GetDomain();
   AssemblyName^ myAsmName = gcnew AssemblyName;
   myAsmName->Name = "MyDynamicAssembly";
   AssemblyBuilder^ myAsmBuilder = myDomain->DefineDynamicAssembly( myAsmName, AssemblyBuilderAccess::Run );
   ModuleBuilder^ pointModule = myAsmBuilder->DefineDynamicModule( "PointModule", "Point.dll" );
   TypeBuilder^ pointTypeBld = pointModule->DefineType( "Point", TypeAttributes::Public );
   FieldBuilder^ xField = pointTypeBld->DefineField( "x", int::typeid, FieldAttributes::Public );
   FieldBuilder^ yField = pointTypeBld->DefineField( "y", int::typeid, FieldAttributes::Public );
   Type^ objType = Type::GetType( "System.Object" );
   ConstructorInfo^ objCtor = objType->GetConstructor( gcnew array<Type^>(0) );
   ConstructorBuilder^ pointCtor = pointTypeBld->DefineConstructor( MethodAttributes::Public, CallingConventions::Standard, ctorParams );
   ILGenerator^ ctorIL = pointCtor->GetILGenerator();
   
   // First, you build the constructor.
   ctorIL->Emit( OpCodes::Ldarg_0 );
   ctorIL->Emit( OpCodes::Call, objCtor );
   ctorIL->Emit( OpCodes::Ldarg_0 );
   ctorIL->Emit( OpCodes::Ldarg_1 );
   ctorIL->Emit( OpCodes::Stfld, xField );
   ctorIL->Emit( OpCodes::Ldarg_0 );
   ctorIL->Emit( OpCodes::Ldarg_2 );
   ctorIL->Emit( OpCodes::Stfld, yField );
   ctorIL->Emit( OpCodes::Ret );
   
   //  Now, you'll build a method to output some information on the
   // inside your dynamic class. This method will have the following
   // definition in C#:
   //  public void WritePoint()
   MethodBuilder^ writeStrMthd = pointTypeBld->DefineMethod( "WritePoint", MethodAttributes::Public, void::typeid, nullptr );
   ILGenerator^ writeStrIL = writeStrMthd->GetILGenerator();
   
   // The below ILGenerator created demonstrates a few ways to create
   // String* output through STDIN.
   // ILGenerator::EmitWriteLine(String*) will generate a ldstr and a
   // call to WriteLine for you.
   writeStrIL->EmitWriteLine( "The value of this current instance is:" );
   
   // Here, you will do the hard work yourself. First, you need to create
   // the String* we will be passing and obtain the correct WriteLine overload
   // for said String*. In the below case, you are substituting in two values,
   // so the chosen overload is Console::WriteLine(String*, Object*, Object*).
   String^ inStr = "( {0}, {1})";
   array<Type^>^wlParams = {String::typeid,Object::typeid,Object::typeid};
   
   // We need the MethodInfo to pass into EmitCall later.
   MethodInfo^ writeLineMI = Console::typeid->GetMethod( "WriteLine", wlParams );
   
   // Push the String* with the substitutions onto the stack.
   // This is the first argument for WriteLine - the String* one.
   writeStrIL->Emit( OpCodes::Ldstr, inStr );
   
   // Since the second argument is an Object*, and it corresponds to
   // to the substitution for the value of our integer field, you
   // need to box that field to an Object*. First, push a reference
   // to the current instance, and then push the value stored in
   // field 'x'. We need the reference to the current instance (stored
   // in local argument index 0) so Ldfld can load from the correct
   // instance (this one).
   writeStrIL->Emit( OpCodes::Ldarg_0 );
   writeStrIL->Emit( OpCodes::Ldfld, xField );
   
   // Now, we execute the box opcode, which pops the value of field 'x',
   // returning a reference to the integer value boxed as an Object*.
   writeStrIL->Emit( OpCodes::Box, int::typeid );
   
   // Atop the stack, you'll find our String* inStr, followed by a reference
   // to the boxed value of 'x'. Now, you need to likewise box field 'y'.
   writeStrIL->Emit( OpCodes::Ldarg_0 );
   writeStrIL->Emit( OpCodes::Ldfld, yField );
   writeStrIL->Emit( OpCodes::Box, int::typeid );
   
   // Now, you have all of the arguments for your call to
   // Console::WriteLine(String*, Object*, Object*) atop the stack:
   // the String* InStr, a reference to the boxed value of 'x', and
   // a reference to the boxed value of 'y'.
   // Call Console::WriteLine(String*, Object*, Object*) with EmitCall.
   writeStrIL->EmitCall( OpCodes::Call, writeLineMI, nullptr );
   
   // Lastly, EmitWriteLine can also output the value of a field
   // using the overload EmitWriteLine(FieldInfo).
   writeStrIL->EmitWriteLine( "The value of 'x' is:" );
   writeStrIL->EmitWriteLine( xField );
   writeStrIL->EmitWriteLine( "The value of 'y' is:" );
   writeStrIL->EmitWriteLine( yField );
   
   // Since we return no value (void), the ret opcode will not
   // return the top stack value.
   writeStrIL->Emit( OpCodes::Ret );
   return pointTypeBld->CreateType();
}

int main()
{
   array<Object^>^ctorParams = gcnew array<Object^>(2);
   Console::Write( "Enter a integer value for X: " );
   String^ myX = Console::ReadLine();
   Console::Write( "Enter a integer value for Y: " );
   String^ myY = Console::ReadLine();
   Console::WriteLine( "---" );
   ctorParams[ 0 ] = Convert::ToInt32( myX );
   ctorParams[ 1 ] = Convert::ToInt32( myY );
   Type^ ptType = CreateDynamicType();
   Object^ ptInstance = Activator::CreateInstance( ptType, ctorParams );
   ptType->InvokeMember( "WritePoint", BindingFlags::InvokeMethod, nullptr, ptInstance, gcnew array<Object^>(0) );
}


using System;
using System.Threading;
using System.Reflection;
using System.Reflection.Emit;

class EmitWriteLineDemo {

   public static Type CreateDynamicType() {
       Type[] ctorParams = new Type[] {typeof(int),
                   typeof(int)};
    
       AppDomain myDomain = Thread.GetDomain();
       AssemblyName myAsmName = new AssemblyName();
       myAsmName.Name = "MyDynamicAssembly";

       AssemblyBuilder myAsmBuilder = myDomain.DefineDynamicAssembly(
                      myAsmName,
                      AssemblyBuilderAccess.Run);

       ModuleBuilder pointModule = myAsmBuilder.DefineDynamicModule("PointModule",
                                    "Point.dll");

       TypeBuilder pointTypeBld = pointModule.DefineType("Point",
                                  TypeAttributes.Public);

       FieldBuilder xField = pointTypeBld.DefineField("x", typeof(int),
                                                      FieldAttributes.Public);
       FieldBuilder yField = pointTypeBld.DefineField("y", typeof(int),
                                                      FieldAttributes.Public);

       Type objType = Type.GetType("System.Object");
       ConstructorInfo objCtor = objType.GetConstructor(new Type[0]);

       ConstructorBuilder pointCtor = pointTypeBld.DefineConstructor(
                                   MethodAttributes.Public,
                                   CallingConventions.Standard,
                                   ctorParams);
       ILGenerator ctorIL = pointCtor.GetILGenerator();

       // First, you build the constructor.
       ctorIL.Emit(OpCodes.Ldarg_0);
       ctorIL.Emit(OpCodes.Call, objCtor);
       ctorIL.Emit(OpCodes.Ldarg_0);
       ctorIL.Emit(OpCodes.Ldarg_1);
       ctorIL.Emit(OpCodes.Stfld, xField);
       ctorIL.Emit(OpCodes.Ldarg_0);
       ctorIL.Emit(OpCodes.Ldarg_2);
       ctorIL.Emit(OpCodes.Stfld, yField);
       ctorIL.Emit(OpCodes.Ret);

       //  Now, you'll build a method to output some information on the
       // inside your dynamic class. This method will have the following
       // definition in C#:
    //  public void WritePoint()

       MethodBuilder writeStrMthd = pointTypeBld.DefineMethod(
                                     "WritePoint",
                             MethodAttributes.Public,
                                             typeof(void),
                                             null);

       ILGenerator writeStrIL = writeStrMthd.GetILGenerator();

       // The below ILGenerator created demonstrates a few ways to create
       // string output through STDIN.

       // ILGenerator.EmitWriteLine(string) will generate a ldstr and a
       // call to WriteLine for you.

       writeStrIL.EmitWriteLine("The value of this current instance is:");

       // Here, you will do the hard work yourself. First, you need to create
       // the string we will be passing and obtain the correct WriteLine overload
       // for said string. In the below case, you are substituting in two values,
       // so the chosen overload is Console.WriteLine(string, object, object).

       String inStr = "({0}, {1})";
       Type[] wlParams = new Type[] {typeof(string),
                     typeof(object),
                     typeof(object)};

       // We need the MethodInfo to pass into EmitCall later.

       MethodInfo writeLineMI = typeof(Console).GetMethod(
                            "WriteLine",
                        wlParams);

       // Push the string with the substitutions onto the stack.
       // This is the first argument for WriteLine - the string one.

       writeStrIL.Emit(OpCodes.Ldstr, inStr);

       // Since the second argument is an object, and it corresponds to
       // to the substitution for the value of our integer field, you
       // need to box that field to an object. First, push a reference
       // to the current instance, and then push the value stored in
       // field 'x'. We need the reference to the current instance (stored
       // in local argument index 0) so Ldfld can load from the correct
       // instance (this one).

       writeStrIL.Emit(OpCodes.Ldarg_0);
       writeStrIL.Emit(OpCodes.Ldfld, xField);

       // Now, we execute the box opcode, which pops the value of field 'x',
       // returning a reference to the integer value boxed as an object.

       writeStrIL.Emit(OpCodes.Box, typeof(int));

       // Atop the stack, you'll find our string inStr, followed by a reference
       // to the boxed value of 'x'. Now, you need to likewise box field 'y'.

       writeStrIL.Emit(OpCodes.Ldarg_0);
       writeStrIL.Emit(OpCodes.Ldfld, yField);
       writeStrIL.Emit(OpCodes.Box, typeof(int));

       // Now, you have all of the arguments for your call to
       // Console.WriteLine(string, object, object) atop the stack:
       // the string InStr, a reference to the boxed value of 'x', and
       // a reference to the boxed value of 'y'.

       // Call Console.WriteLine(string, object, object) with EmitCall.

       writeStrIL.EmitCall(OpCodes.Call, writeLineMI, null);

       // Lastly, EmitWriteLine can also output the value of a field
       // using the overload EmitWriteLine(FieldInfo).

       writeStrIL.EmitWriteLine("The value of 'x' is:");
       writeStrIL.EmitWriteLine(xField);
       writeStrIL.EmitWriteLine("The value of 'y' is:");
       writeStrIL.EmitWriteLine(yField);

       // Since we return no value (void), the ret opcode will not
       // return the top stack value.

       writeStrIL.Emit(OpCodes.Ret);

       return pointTypeBld.CreateType();
   }

   public static void Main() {

      object[] ctorParams = new object[2];

      Console.Write("Enter a integer value for X: ");
      string myX = Console.ReadLine();
      Console.Write("Enter a integer value for Y: ");
      string myY = Console.ReadLine();

      Console.WriteLine("---");

      ctorParams[0] = Convert.ToInt32(myX);
      ctorParams[1] = Convert.ToInt32(myY);

      Type ptType = CreateDynamicType();

      object ptInstance = Activator.CreateInstance(ptType, ctorParams);
      ptType.InvokeMember("WritePoint",
              BindingFlags.InvokeMethod,
              null,
              ptInstance,
              new object[0]);
   }
}


Imports System.Threading
Imports System.Reflection
Imports System.Reflection.Emit

 _

Class EmitWriteLineDemo
   
   
   Public Shared Function CreateDynamicType() As Type

      Dim ctorParams() As Type = {GetType(Integer), GetType(Integer)}
      
      Dim myDomain As AppDomain = Thread.GetDomain()
      Dim myAsmName As New AssemblyName()
      myAsmName.Name = "MyDynamicAssembly"
      
      Dim myAsmBuilder As AssemblyBuilder = myDomain.DefineDynamicAssembly(myAsmName, AssemblyBuilderAccess.RunAndSave)
      
      Dim pointModule As ModuleBuilder = myAsmBuilder.DefineDynamicModule("PointModule", "Point.dll")
      
      Dim pointTypeBld As TypeBuilder = pointModule.DefineType("Point", _
                                   TypeAttributes.Public)
      
      Dim xField As FieldBuilder = pointTypeBld.DefineField("x", _
                                GetType(Integer), _
                                FieldAttributes.Public)
      Dim yField As FieldBuilder = pointTypeBld.DefineField("y", _
                                GetType(Integer), _
                                FieldAttributes.Public)
      
      
      Dim objType As Type = Type.GetType("System.Object")
      Dim objCtor As ConstructorInfo = objType.GetConstructor(New Type(){})
      
      Dim pointCtor As ConstructorBuilder = pointTypeBld.DefineConstructor( _
                             MethodAttributes.Public, _
                             CallingConventions.Standard, _
                             ctorParams)
      Dim ctorIL As ILGenerator = pointCtor.GetILGenerator()
      
      
      ' First, you build the constructor.

      ctorIL.Emit(OpCodes.Ldarg_0)
      ctorIL.Emit(OpCodes.Call, objCtor)
      ctorIL.Emit(OpCodes.Ldarg_0)
      ctorIL.Emit(OpCodes.Ldarg_1)
      ctorIL.Emit(OpCodes.Stfld, xField)
      ctorIL.Emit(OpCodes.Ldarg_0)
      ctorIL.Emit(OpCodes.Ldarg_2)
      ctorIL.Emit(OpCodes.Stfld, yField)
      ctorIL.Emit(OpCodes.Ret)
      
      '  Now, you'll build a method to output some information on the
      ' inside your dynamic class. This method will have the following
      ' definition in C#:
      '  Public Sub WritePoint() 

      Dim writeStrMthd As MethodBuilder = pointTypeBld.DefineMethod("WritePoint", _
                                    MethodAttributes.Public, _
                                    Nothing, Nothing)
      
      Dim writeStrIL As ILGenerator = writeStrMthd.GetILGenerator()
      
      ' The below ILGenerator created demonstrates a few ways to create
      ' string output through STDIN. 
      ' ILGenerator.EmitWriteLine(string) will generate a ldstr and a 
      ' call to WriteLine for you.

      writeStrIL.EmitWriteLine("The value of this current instance is:")
      
      ' Here, you will do the hard work yourself. First, you need to create
      ' the string we will be passing and obtain the correct WriteLine overload
      ' for said string. In the below case, you are substituting in two values,
      ' so the chosen overload is Console.WriteLine(string, object, object).

      Dim inStr As [String] = "({0}, {1})"
      Dim wlParams() As Type = {GetType(String), GetType(Object), GetType(Object)}
      
      ' We need the MethodInfo to pass into EmitCall later.

      Dim writeLineMI As MethodInfo = GetType(Console).GetMethod("WriteLine", wlParams)
      
      ' Push the string with the substitutions onto the stack.
      ' This is the first argument for WriteLine - the string one. 

      writeStrIL.Emit(OpCodes.Ldstr, inStr)
      
      ' Since the second argument is an object, and it corresponds to
      ' to the substitution for the value of our integer field, you 
      ' need to box that field to an object. First, push a reference
      ' to the current instance, and then push the value stored in
      ' field 'x'. We need the reference to the current instance (stored
      ' in local argument index 0) so Ldfld can load from the correct
      ' instance (this one).

      writeStrIL.Emit(OpCodes.Ldarg_0)
      writeStrIL.Emit(OpCodes.Ldfld, xField)
      
      ' Now, we execute the box opcode, which pops the value of field 'x',
      ' returning a reference to the integer value boxed as an object.

      writeStrIL.Emit(OpCodes.Box, GetType(Integer))
      
      ' Atop the stack, you'll find our string inStr, followed by a reference
      ' to the boxed value of 'x'. Now, you need to likewise box field 'y'.

      writeStrIL.Emit(OpCodes.Ldarg_0)
      writeStrIL.Emit(OpCodes.Ldfld, yField)
      writeStrIL.Emit(OpCodes.Box, GetType(Integer))
      
      ' Now, you have all of the arguments for your call to
      ' Console.WriteLine(string, object, object) atop the stack:
      ' the string InStr, a reference to the boxed value of 'x', and
      ' a reference to the boxed value of 'y'.
      ' Call Console.WriteLine(string, object, object) with EmitCall.

      writeStrIL.EmitCall(OpCodes.Call, writeLineMI, Nothing)
      
      ' Lastly, EmitWriteLine can also output the value of a field
      ' using the overload EmitWriteLine(FieldInfo).

      writeStrIL.EmitWriteLine("The value of 'x' is:")
      writeStrIL.EmitWriteLine(xField)
      writeStrIL.EmitWriteLine("The value of 'y' is:")
      writeStrIL.EmitWriteLine(yField)
      
      ' Since we return no value (void), the ret opcode will not
      ' return the top stack value.

      writeStrIL.Emit(OpCodes.Ret)
      
      Return pointTypeBld.CreateType()

   End Function 'CreateDynamicType
    
   
   Public Shared Sub Main()
      
      Dim ctorParams(1) As Object
      
      Console.Write("Enter a integer value for X: ")
      Dim myX As String = Console.ReadLine()
      Console.Write("Enter a integer value for Y: ")
      Dim myY As String = Console.ReadLine()
      
      Console.WriteLine("---")
      
      ctorParams(0) = Convert.ToInt32(myX)
      ctorParams(1) = Convert.ToInt32(myY)
      
      Dim ptType As Type = CreateDynamicType()

      Dim ptInstance As Object = Activator.CreateInstance(ptType, ctorParams)

      ptType.InvokeMember("WritePoint", _
              BindingFlags.InvokeMethod, _
              Nothing, ptInstance, Nothing)

   End Sub

End Class

Remarques

La chaîne doit avoir déjà été définie.

S’applique à

EmitWriteLine(FieldInfo)

Source:
ILGenerator.cs
Source:
ILGenerator.cs
Source:
ILGenerator.cs

Émet le code MSIL (Microsoft Intermediate Language) nécessaire pour appeler WriteLine avec le champ donné.

public:
 virtual void EmitWriteLine(System::Reflection::FieldInfo ^ fld);
public virtual void EmitWriteLine (System.Reflection.FieldInfo fld);
abstract member EmitWriteLine : System.Reflection.FieldInfo -> unit
override this.EmitWriteLine : System.Reflection.FieldInfo -> unit
Public Overridable Sub EmitWriteLine (fld As FieldInfo)

Paramètres

fld
FieldInfo

Champ dont la valeur est à écrire dans la console.

Exceptions

ArgumentException

Aucune surcharge de la méthode WriteLine n'accepte le type du champ spécifié.

ArgumentNullException

fld a la valeur null.

NotSupportedException

Le champ est de type TypeBuilder ou EnumBuilder, qui ne sont pas pris en charge.

Exemples

L’exemple de code suivant illustre l’utilisation de la EmitWriteLine méthode pour écrire une chaîne dans la console dans une méthode dynamique.

using namespace System;
using namespace System::Threading;
using namespace System::Reflection;
using namespace System::Reflection::Emit;
Type^ CreateDynamicType()
{
   array<Type^>^ctorParams = {int::typeid,int::typeid};
   AppDomain^ myDomain = Thread::GetDomain();
   AssemblyName^ myAsmName = gcnew AssemblyName;
   myAsmName->Name = "MyDynamicAssembly";
   AssemblyBuilder^ myAsmBuilder = myDomain->DefineDynamicAssembly( myAsmName, AssemblyBuilderAccess::Run );
   ModuleBuilder^ pointModule = myAsmBuilder->DefineDynamicModule( "PointModule", "Point.dll" );
   TypeBuilder^ pointTypeBld = pointModule->DefineType( "Point", TypeAttributes::Public );
   FieldBuilder^ xField = pointTypeBld->DefineField( "x", int::typeid, FieldAttributes::Public );
   FieldBuilder^ yField = pointTypeBld->DefineField( "y", int::typeid, FieldAttributes::Public );
   Type^ objType = Type::GetType( "System.Object" );
   ConstructorInfo^ objCtor = objType->GetConstructor( gcnew array<Type^>(0) );
   ConstructorBuilder^ pointCtor = pointTypeBld->DefineConstructor( MethodAttributes::Public, CallingConventions::Standard, ctorParams );
   ILGenerator^ ctorIL = pointCtor->GetILGenerator();
   
   // First, you build the constructor.
   ctorIL->Emit( OpCodes::Ldarg_0 );
   ctorIL->Emit( OpCodes::Call, objCtor );
   ctorIL->Emit( OpCodes::Ldarg_0 );
   ctorIL->Emit( OpCodes::Ldarg_1 );
   ctorIL->Emit( OpCodes::Stfld, xField );
   ctorIL->Emit( OpCodes::Ldarg_0 );
   ctorIL->Emit( OpCodes::Ldarg_2 );
   ctorIL->Emit( OpCodes::Stfld, yField );
   ctorIL->Emit( OpCodes::Ret );
   
   //  Now, you'll build a method to output some information on the
   // inside your dynamic class. This method will have the following
   // definition in C#:
   //  public void WritePoint()
   MethodBuilder^ writeStrMthd = pointTypeBld->DefineMethod( "WritePoint", MethodAttributes::Public, void::typeid, nullptr );
   ILGenerator^ writeStrIL = writeStrMthd->GetILGenerator();
   
   // The below ILGenerator created demonstrates a few ways to create
   // String* output through STDIN.
   // ILGenerator::EmitWriteLine(String*) will generate a ldstr and a
   // call to WriteLine for you.
   writeStrIL->EmitWriteLine( "The value of this current instance is:" );
   
   // Here, you will do the hard work yourself. First, you need to create
   // the String* we will be passing and obtain the correct WriteLine overload
   // for said String*. In the below case, you are substituting in two values,
   // so the chosen overload is Console::WriteLine(String*, Object*, Object*).
   String^ inStr = "( {0}, {1})";
   array<Type^>^wlParams = {String::typeid,Object::typeid,Object::typeid};
   
   // We need the MethodInfo to pass into EmitCall later.
   MethodInfo^ writeLineMI = Console::typeid->GetMethod( "WriteLine", wlParams );
   
   // Push the String* with the substitutions onto the stack.
   // This is the first argument for WriteLine - the String* one.
   writeStrIL->Emit( OpCodes::Ldstr, inStr );
   
   // Since the second argument is an Object*, and it corresponds to
   // to the substitution for the value of our integer field, you
   // need to box that field to an Object*. First, push a reference
   // to the current instance, and then push the value stored in
   // field 'x'. We need the reference to the current instance (stored
   // in local argument index 0) so Ldfld can load from the correct
   // instance (this one).
   writeStrIL->Emit( OpCodes::Ldarg_0 );
   writeStrIL->Emit( OpCodes::Ldfld, xField );
   
   // Now, we execute the box opcode, which pops the value of field 'x',
   // returning a reference to the integer value boxed as an Object*.
   writeStrIL->Emit( OpCodes::Box, int::typeid );
   
   // Atop the stack, you'll find our String* inStr, followed by a reference
   // to the boxed value of 'x'. Now, you need to likewise box field 'y'.
   writeStrIL->Emit( OpCodes::Ldarg_0 );
   writeStrIL->Emit( OpCodes::Ldfld, yField );
   writeStrIL->Emit( OpCodes::Box, int::typeid );
   
   // Now, you have all of the arguments for your call to
   // Console::WriteLine(String*, Object*, Object*) atop the stack:
   // the String* InStr, a reference to the boxed value of 'x', and
   // a reference to the boxed value of 'y'.
   // Call Console::WriteLine(String*, Object*, Object*) with EmitCall.
   writeStrIL->EmitCall( OpCodes::Call, writeLineMI, nullptr );
   
   // Lastly, EmitWriteLine can also output the value of a field
   // using the overload EmitWriteLine(FieldInfo).
   writeStrIL->EmitWriteLine( "The value of 'x' is:" );
   writeStrIL->EmitWriteLine( xField );
   writeStrIL->EmitWriteLine( "The value of 'y' is:" );
   writeStrIL->EmitWriteLine( yField );
   
   // Since we return no value (void), the ret opcode will not
   // return the top stack value.
   writeStrIL->Emit( OpCodes::Ret );
   return pointTypeBld->CreateType();
}

int main()
{
   array<Object^>^ctorParams = gcnew array<Object^>(2);
   Console::Write( "Enter a integer value for X: " );
   String^ myX = Console::ReadLine();
   Console::Write( "Enter a integer value for Y: " );
   String^ myY = Console::ReadLine();
   Console::WriteLine( "---" );
   ctorParams[ 0 ] = Convert::ToInt32( myX );
   ctorParams[ 1 ] = Convert::ToInt32( myY );
   Type^ ptType = CreateDynamicType();
   Object^ ptInstance = Activator::CreateInstance( ptType, ctorParams );
   ptType->InvokeMember( "WritePoint", BindingFlags::InvokeMethod, nullptr, ptInstance, gcnew array<Object^>(0) );
}


using System;
using System.Threading;
using System.Reflection;
using System.Reflection.Emit;

class EmitWriteLineDemo {

   public static Type CreateDynamicType() {
       Type[] ctorParams = new Type[] {typeof(int),
                   typeof(int)};
    
       AppDomain myDomain = Thread.GetDomain();
       AssemblyName myAsmName = new AssemblyName();
       myAsmName.Name = "MyDynamicAssembly";

       AssemblyBuilder myAsmBuilder = myDomain.DefineDynamicAssembly(
                      myAsmName,
                      AssemblyBuilderAccess.Run);

       ModuleBuilder pointModule = myAsmBuilder.DefineDynamicModule("PointModule",
                                    "Point.dll");

       TypeBuilder pointTypeBld = pointModule.DefineType("Point",
                                  TypeAttributes.Public);

       FieldBuilder xField = pointTypeBld.DefineField("x", typeof(int),
                                                      FieldAttributes.Public);
       FieldBuilder yField = pointTypeBld.DefineField("y", typeof(int),
                                                      FieldAttributes.Public);

       Type objType = Type.GetType("System.Object");
       ConstructorInfo objCtor = objType.GetConstructor(new Type[0]);

       ConstructorBuilder pointCtor = pointTypeBld.DefineConstructor(
                                   MethodAttributes.Public,
                                   CallingConventions.Standard,
                                   ctorParams);
       ILGenerator ctorIL = pointCtor.GetILGenerator();

       // First, you build the constructor.
       ctorIL.Emit(OpCodes.Ldarg_0);
       ctorIL.Emit(OpCodes.Call, objCtor);
       ctorIL.Emit(OpCodes.Ldarg_0);
       ctorIL.Emit(OpCodes.Ldarg_1);
       ctorIL.Emit(OpCodes.Stfld, xField);
       ctorIL.Emit(OpCodes.Ldarg_0);
       ctorIL.Emit(OpCodes.Ldarg_2);
       ctorIL.Emit(OpCodes.Stfld, yField);
       ctorIL.Emit(OpCodes.Ret);

       //  Now, you'll build a method to output some information on the
       // inside your dynamic class. This method will have the following
       // definition in C#:
    //  public void WritePoint()

       MethodBuilder writeStrMthd = pointTypeBld.DefineMethod(
                                     "WritePoint",
                             MethodAttributes.Public,
                                             typeof(void),
                                             null);

       ILGenerator writeStrIL = writeStrMthd.GetILGenerator();

       // The below ILGenerator created demonstrates a few ways to create
       // string output through STDIN.

       // ILGenerator.EmitWriteLine(string) will generate a ldstr and a
       // call to WriteLine for you.

       writeStrIL.EmitWriteLine("The value of this current instance is:");

       // Here, you will do the hard work yourself. First, you need to create
       // the string we will be passing and obtain the correct WriteLine overload
       // for said string. In the below case, you are substituting in two values,
       // so the chosen overload is Console.WriteLine(string, object, object).

       String inStr = "({0}, {1})";
       Type[] wlParams = new Type[] {typeof(string),
                     typeof(object),
                     typeof(object)};

       // We need the MethodInfo to pass into EmitCall later.

       MethodInfo writeLineMI = typeof(Console).GetMethod(
                            "WriteLine",
                        wlParams);

       // Push the string with the substitutions onto the stack.
       // This is the first argument for WriteLine - the string one.

       writeStrIL.Emit(OpCodes.Ldstr, inStr);

       // Since the second argument is an object, and it corresponds to
       // to the substitution for the value of our integer field, you
       // need to box that field to an object. First, push a reference
       // to the current instance, and then push the value stored in
       // field 'x'. We need the reference to the current instance (stored
       // in local argument index 0) so Ldfld can load from the correct
       // instance (this one).

       writeStrIL.Emit(OpCodes.Ldarg_0);
       writeStrIL.Emit(OpCodes.Ldfld, xField);

       // Now, we execute the box opcode, which pops the value of field 'x',
       // returning a reference to the integer value boxed as an object.

       writeStrIL.Emit(OpCodes.Box, typeof(int));

       // Atop the stack, you'll find our string inStr, followed by a reference
       // to the boxed value of 'x'. Now, you need to likewise box field 'y'.

       writeStrIL.Emit(OpCodes.Ldarg_0);
       writeStrIL.Emit(OpCodes.Ldfld, yField);
       writeStrIL.Emit(OpCodes.Box, typeof(int));

       // Now, you have all of the arguments for your call to
       // Console.WriteLine(string, object, object) atop the stack:
       // the string InStr, a reference to the boxed value of 'x', and
       // a reference to the boxed value of 'y'.

       // Call Console.WriteLine(string, object, object) with EmitCall.

       writeStrIL.EmitCall(OpCodes.Call, writeLineMI, null);

       // Lastly, EmitWriteLine can also output the value of a field
       // using the overload EmitWriteLine(FieldInfo).

       writeStrIL.EmitWriteLine("The value of 'x' is:");
       writeStrIL.EmitWriteLine(xField);
       writeStrIL.EmitWriteLine("The value of 'y' is:");
       writeStrIL.EmitWriteLine(yField);

       // Since we return no value (void), the ret opcode will not
       // return the top stack value.

       writeStrIL.Emit(OpCodes.Ret);

       return pointTypeBld.CreateType();
   }

   public static void Main() {

      object[] ctorParams = new object[2];

      Console.Write("Enter a integer value for X: ");
      string myX = Console.ReadLine();
      Console.Write("Enter a integer value for Y: ");
      string myY = Console.ReadLine();

      Console.WriteLine("---");

      ctorParams[0] = Convert.ToInt32(myX);
      ctorParams[1] = Convert.ToInt32(myY);

      Type ptType = CreateDynamicType();

      object ptInstance = Activator.CreateInstance(ptType, ctorParams);
      ptType.InvokeMember("WritePoint",
              BindingFlags.InvokeMethod,
              null,
              ptInstance,
              new object[0]);
   }
}


Imports System.Threading
Imports System.Reflection
Imports System.Reflection.Emit

 _

Class EmitWriteLineDemo
   
   
   Public Shared Function CreateDynamicType() As Type

      Dim ctorParams() As Type = {GetType(Integer), GetType(Integer)}
      
      Dim myDomain As AppDomain = Thread.GetDomain()
      Dim myAsmName As New AssemblyName()
      myAsmName.Name = "MyDynamicAssembly"
      
      Dim myAsmBuilder As AssemblyBuilder = myDomain.DefineDynamicAssembly(myAsmName, AssemblyBuilderAccess.RunAndSave)
      
      Dim pointModule As ModuleBuilder = myAsmBuilder.DefineDynamicModule("PointModule", "Point.dll")
      
      Dim pointTypeBld As TypeBuilder = pointModule.DefineType("Point", _
                                   TypeAttributes.Public)
      
      Dim xField As FieldBuilder = pointTypeBld.DefineField("x", _
                                GetType(Integer), _
                                FieldAttributes.Public)
      Dim yField As FieldBuilder = pointTypeBld.DefineField("y", _
                                GetType(Integer), _
                                FieldAttributes.Public)
      
      
      Dim objType As Type = Type.GetType("System.Object")
      Dim objCtor As ConstructorInfo = objType.GetConstructor(New Type(){})
      
      Dim pointCtor As ConstructorBuilder = pointTypeBld.DefineConstructor( _
                             MethodAttributes.Public, _
                             CallingConventions.Standard, _
                             ctorParams)
      Dim ctorIL As ILGenerator = pointCtor.GetILGenerator()
      
      
      ' First, you build the constructor.

      ctorIL.Emit(OpCodes.Ldarg_0)
      ctorIL.Emit(OpCodes.Call, objCtor)
      ctorIL.Emit(OpCodes.Ldarg_0)
      ctorIL.Emit(OpCodes.Ldarg_1)
      ctorIL.Emit(OpCodes.Stfld, xField)
      ctorIL.Emit(OpCodes.Ldarg_0)
      ctorIL.Emit(OpCodes.Ldarg_2)
      ctorIL.Emit(OpCodes.Stfld, yField)
      ctorIL.Emit(OpCodes.Ret)
      
      '  Now, you'll build a method to output some information on the
      ' inside your dynamic class. This method will have the following
      ' definition in C#:
      '  Public Sub WritePoint() 

      Dim writeStrMthd As MethodBuilder = pointTypeBld.DefineMethod("WritePoint", _
                                    MethodAttributes.Public, _
                                    Nothing, Nothing)
      
      Dim writeStrIL As ILGenerator = writeStrMthd.GetILGenerator()
      
      ' The below ILGenerator created demonstrates a few ways to create
      ' string output through STDIN. 
      ' ILGenerator.EmitWriteLine(string) will generate a ldstr and a 
      ' call to WriteLine for you.

      writeStrIL.EmitWriteLine("The value of this current instance is:")
      
      ' Here, you will do the hard work yourself. First, you need to create
      ' the string we will be passing and obtain the correct WriteLine overload
      ' for said string. In the below case, you are substituting in two values,
      ' so the chosen overload is Console.WriteLine(string, object, object).

      Dim inStr As [String] = "({0}, {1})"
      Dim wlParams() As Type = {GetType(String), GetType(Object), GetType(Object)}
      
      ' We need the MethodInfo to pass into EmitCall later.

      Dim writeLineMI As MethodInfo = GetType(Console).GetMethod("WriteLine", wlParams)
      
      ' Push the string with the substitutions onto the stack.
      ' This is the first argument for WriteLine - the string one. 

      writeStrIL.Emit(OpCodes.Ldstr, inStr)
      
      ' Since the second argument is an object, and it corresponds to
      ' to the substitution for the value of our integer field, you 
      ' need to box that field to an object. First, push a reference
      ' to the current instance, and then push the value stored in
      ' field 'x'. We need the reference to the current instance (stored
      ' in local argument index 0) so Ldfld can load from the correct
      ' instance (this one).

      writeStrIL.Emit(OpCodes.Ldarg_0)
      writeStrIL.Emit(OpCodes.Ldfld, xField)
      
      ' Now, we execute the box opcode, which pops the value of field 'x',
      ' returning a reference to the integer value boxed as an object.

      writeStrIL.Emit(OpCodes.Box, GetType(Integer))
      
      ' Atop the stack, you'll find our string inStr, followed by a reference
      ' to the boxed value of 'x'. Now, you need to likewise box field 'y'.

      writeStrIL.Emit(OpCodes.Ldarg_0)
      writeStrIL.Emit(OpCodes.Ldfld, yField)
      writeStrIL.Emit(OpCodes.Box, GetType(Integer))
      
      ' Now, you have all of the arguments for your call to
      ' Console.WriteLine(string, object, object) atop the stack:
      ' the string InStr, a reference to the boxed value of 'x', and
      ' a reference to the boxed value of 'y'.
      ' Call Console.WriteLine(string, object, object) with EmitCall.

      writeStrIL.EmitCall(OpCodes.Call, writeLineMI, Nothing)
      
      ' Lastly, EmitWriteLine can also output the value of a field
      ' using the overload EmitWriteLine(FieldInfo).

      writeStrIL.EmitWriteLine("The value of 'x' is:")
      writeStrIL.EmitWriteLine(xField)
      writeStrIL.EmitWriteLine("The value of 'y' is:")
      writeStrIL.EmitWriteLine(yField)
      
      ' Since we return no value (void), the ret opcode will not
      ' return the top stack value.

      writeStrIL.Emit(OpCodes.Ret)
      
      Return pointTypeBld.CreateType()

   End Function 'CreateDynamicType
    
   
   Public Shared Sub Main()
      
      Dim ctorParams(1) As Object
      
      Console.Write("Enter a integer value for X: ")
      Dim myX As String = Console.ReadLine()
      Console.Write("Enter a integer value for Y: ")
      Dim myY As String = Console.ReadLine()
      
      Console.WriteLine("---")
      
      ctorParams(0) = Convert.ToInt32(myX)
      ctorParams(1) = Convert.ToInt32(myY)
      
      Dim ptType As Type = CreateDynamicType()

      Dim ptInstance As Object = Activator.CreateInstance(ptType, ctorParams)

      ptType.InvokeMember("WritePoint", _
              BindingFlags.InvokeMethod, _
              Nothing, ptInstance, Nothing)

   End Sub

End Class

Remarques

Le type de fld doit correspondre au type de paramètre d’une surcharge de la Console.WriteLine méthode .

S’applique à

EmitWriteLine(LocalBuilder)

Source:
ILGenerator.cs
Source:
ILGenerator.cs
Source:
ILGenerator.cs

Émet le langage MSIL nécessaire pour appeler WriteLine avec la variable locale donnée.

public:
 virtual void EmitWriteLine(System::Reflection::Emit::LocalBuilder ^ localBuilder);
public virtual void EmitWriteLine (System.Reflection.Emit.LocalBuilder localBuilder);
abstract member EmitWriteLine : System.Reflection.Emit.LocalBuilder -> unit
override this.EmitWriteLine : System.Reflection.Emit.LocalBuilder -> unit
Public Overridable Sub EmitWriteLine (localBuilder As LocalBuilder)

Paramètres

localBuilder
LocalBuilder

La variable locale dont la valeur doit être écrite dans la console.

Exceptions

ArgumentException

Le type de localBuilder est TypeBuilder ou EnumBuilder, qui ne sont pas pris en charge.

- ou -

Aucune surcharge de WriteLine n’accepte le type de localBuilder.

ArgumentNullException

localBuilder a la valeur null.

Exemples

L’exemple de code ci-dessous illustre l’utilisation contextuelle de la EmitWriteLine méthode pour écrire une chaîne dans la console dans une méthode dynamique.

using namespace System;
using namespace System::Threading;
using namespace System::Reflection;
using namespace System::Reflection::Emit;
Type^ CreateDynamicType()
{
   array<Type^>^ctorParams = {int::typeid,int::typeid};
   AppDomain^ myDomain = Thread::GetDomain();
   AssemblyName^ myAsmName = gcnew AssemblyName;
   myAsmName->Name = "MyDynamicAssembly";
   AssemblyBuilder^ myAsmBuilder = myDomain->DefineDynamicAssembly( myAsmName, AssemblyBuilderAccess::Run );
   ModuleBuilder^ pointModule = myAsmBuilder->DefineDynamicModule( "PointModule", "Point.dll" );
   TypeBuilder^ pointTypeBld = pointModule->DefineType( "Point", TypeAttributes::Public );
   FieldBuilder^ xField = pointTypeBld->DefineField( "x", int::typeid, FieldAttributes::Public );
   FieldBuilder^ yField = pointTypeBld->DefineField( "y", int::typeid, FieldAttributes::Public );
   Type^ objType = Type::GetType( "System.Object" );
   ConstructorInfo^ objCtor = objType->GetConstructor( gcnew array<Type^>(0) );
   ConstructorBuilder^ pointCtor = pointTypeBld->DefineConstructor( MethodAttributes::Public, CallingConventions::Standard, ctorParams );
   ILGenerator^ ctorIL = pointCtor->GetILGenerator();
   
   // First, you build the constructor.
   ctorIL->Emit( OpCodes::Ldarg_0 );
   ctorIL->Emit( OpCodes::Call, objCtor );
   ctorIL->Emit( OpCodes::Ldarg_0 );
   ctorIL->Emit( OpCodes::Ldarg_1 );
   ctorIL->Emit( OpCodes::Stfld, xField );
   ctorIL->Emit( OpCodes::Ldarg_0 );
   ctorIL->Emit( OpCodes::Ldarg_2 );
   ctorIL->Emit( OpCodes::Stfld, yField );
   ctorIL->Emit( OpCodes::Ret );
   
   //  Now, you'll build a method to output some information on the
   // inside your dynamic class. This method will have the following
   // definition in C#:
   //  public void WritePoint()
   MethodBuilder^ writeStrMthd = pointTypeBld->DefineMethod( "WritePoint", MethodAttributes::Public, void::typeid, nullptr );
   ILGenerator^ writeStrIL = writeStrMthd->GetILGenerator();
   
   // The below ILGenerator created demonstrates a few ways to create
   // String* output through STDIN.
   // ILGenerator::EmitWriteLine(String*) will generate a ldstr and a
   // call to WriteLine for you.
   writeStrIL->EmitWriteLine( "The value of this current instance is:" );
   
   // Here, you will do the hard work yourself. First, you need to create
   // the String* we will be passing and obtain the correct WriteLine overload
   // for said String*. In the below case, you are substituting in two values,
   // so the chosen overload is Console::WriteLine(String*, Object*, Object*).
   String^ inStr = "( {0}, {1})";
   array<Type^>^wlParams = {String::typeid,Object::typeid,Object::typeid};
   
   // We need the MethodInfo to pass into EmitCall later.
   MethodInfo^ writeLineMI = Console::typeid->GetMethod( "WriteLine", wlParams );
   
   // Push the String* with the substitutions onto the stack.
   // This is the first argument for WriteLine - the String* one.
   writeStrIL->Emit( OpCodes::Ldstr, inStr );
   
   // Since the second argument is an Object*, and it corresponds to
   // to the substitution for the value of our integer field, you
   // need to box that field to an Object*. First, push a reference
   // to the current instance, and then push the value stored in
   // field 'x'. We need the reference to the current instance (stored
   // in local argument index 0) so Ldfld can load from the correct
   // instance (this one).
   writeStrIL->Emit( OpCodes::Ldarg_0 );
   writeStrIL->Emit( OpCodes::Ldfld, xField );
   
   // Now, we execute the box opcode, which pops the value of field 'x',
   // returning a reference to the integer value boxed as an Object*.
   writeStrIL->Emit( OpCodes::Box, int::typeid );
   
   // Atop the stack, you'll find our String* inStr, followed by a reference
   // to the boxed value of 'x'. Now, you need to likewise box field 'y'.
   writeStrIL->Emit( OpCodes::Ldarg_0 );
   writeStrIL->Emit( OpCodes::Ldfld, yField );
   writeStrIL->Emit( OpCodes::Box, int::typeid );
   
   // Now, you have all of the arguments for your call to
   // Console::WriteLine(String*, Object*, Object*) atop the stack:
   // the String* InStr, a reference to the boxed value of 'x', and
   // a reference to the boxed value of 'y'.
   // Call Console::WriteLine(String*, Object*, Object*) with EmitCall.
   writeStrIL->EmitCall( OpCodes::Call, writeLineMI, nullptr );
   
   // Lastly, EmitWriteLine can also output the value of a field
   // using the overload EmitWriteLine(FieldInfo).
   writeStrIL->EmitWriteLine( "The value of 'x' is:" );
   writeStrIL->EmitWriteLine( xField );
   writeStrIL->EmitWriteLine( "The value of 'y' is:" );
   writeStrIL->EmitWriteLine( yField );
   
   // Since we return no value (void), the ret opcode will not
   // return the top stack value.
   writeStrIL->Emit( OpCodes::Ret );
   return pointTypeBld->CreateType();
}

int main()
{
   array<Object^>^ctorParams = gcnew array<Object^>(2);
   Console::Write( "Enter a integer value for X: " );
   String^ myX = Console::ReadLine();
   Console::Write( "Enter a integer value for Y: " );
   String^ myY = Console::ReadLine();
   Console::WriteLine( "---" );
   ctorParams[ 0 ] = Convert::ToInt32( myX );
   ctorParams[ 1 ] = Convert::ToInt32( myY );
   Type^ ptType = CreateDynamicType();
   Object^ ptInstance = Activator::CreateInstance( ptType, ctorParams );
   ptType->InvokeMember( "WritePoint", BindingFlags::InvokeMethod, nullptr, ptInstance, gcnew array<Object^>(0) );
}


using System;
using System.Threading;
using System.Reflection;
using System.Reflection.Emit;

class EmitWriteLineDemo {

   public static Type CreateDynamicType() {
       Type[] ctorParams = new Type[] {typeof(int),
                   typeof(int)};
    
       AppDomain myDomain = Thread.GetDomain();
       AssemblyName myAsmName = new AssemblyName();
       myAsmName.Name = "MyDynamicAssembly";

       AssemblyBuilder myAsmBuilder = myDomain.DefineDynamicAssembly(
                      myAsmName,
                      AssemblyBuilderAccess.Run);

       ModuleBuilder pointModule = myAsmBuilder.DefineDynamicModule("PointModule",
                                    "Point.dll");

       TypeBuilder pointTypeBld = pointModule.DefineType("Point",
                                  TypeAttributes.Public);

       FieldBuilder xField = pointTypeBld.DefineField("x", typeof(int),
                                                      FieldAttributes.Public);
       FieldBuilder yField = pointTypeBld.DefineField("y", typeof(int),
                                                      FieldAttributes.Public);

       Type objType = Type.GetType("System.Object");
       ConstructorInfo objCtor = objType.GetConstructor(new Type[0]);

       ConstructorBuilder pointCtor = pointTypeBld.DefineConstructor(
                                   MethodAttributes.Public,
                                   CallingConventions.Standard,
                                   ctorParams);
       ILGenerator ctorIL = pointCtor.GetILGenerator();

       // First, you build the constructor.
       ctorIL.Emit(OpCodes.Ldarg_0);
       ctorIL.Emit(OpCodes.Call, objCtor);
       ctorIL.Emit(OpCodes.Ldarg_0);
       ctorIL.Emit(OpCodes.Ldarg_1);
       ctorIL.Emit(OpCodes.Stfld, xField);
       ctorIL.Emit(OpCodes.Ldarg_0);
       ctorIL.Emit(OpCodes.Ldarg_2);
       ctorIL.Emit(OpCodes.Stfld, yField);
       ctorIL.Emit(OpCodes.Ret);

       //  Now, you'll build a method to output some information on the
       // inside your dynamic class. This method will have the following
       // definition in C#:
    //  public void WritePoint()

       MethodBuilder writeStrMthd = pointTypeBld.DefineMethod(
                                     "WritePoint",
                             MethodAttributes.Public,
                                             typeof(void),
                                             null);

       ILGenerator writeStrIL = writeStrMthd.GetILGenerator();

       // The below ILGenerator created demonstrates a few ways to create
       // string output through STDIN.

       // ILGenerator.EmitWriteLine(string) will generate a ldstr and a
       // call to WriteLine for you.

       writeStrIL.EmitWriteLine("The value of this current instance is:");

       // Here, you will do the hard work yourself. First, you need to create
       // the string we will be passing and obtain the correct WriteLine overload
       // for said string. In the below case, you are substituting in two values,
       // so the chosen overload is Console.WriteLine(string, object, object).

       String inStr = "({0}, {1})";
       Type[] wlParams = new Type[] {typeof(string),
                     typeof(object),
                     typeof(object)};

       // We need the MethodInfo to pass into EmitCall later.

       MethodInfo writeLineMI = typeof(Console).GetMethod(
                            "WriteLine",
                        wlParams);

       // Push the string with the substitutions onto the stack.
       // This is the first argument for WriteLine - the string one.

       writeStrIL.Emit(OpCodes.Ldstr, inStr);

       // Since the second argument is an object, and it corresponds to
       // to the substitution for the value of our integer field, you
       // need to box that field to an object. First, push a reference
       // to the current instance, and then push the value stored in
       // field 'x'. We need the reference to the current instance (stored
       // in local argument index 0) so Ldfld can load from the correct
       // instance (this one).

       writeStrIL.Emit(OpCodes.Ldarg_0);
       writeStrIL.Emit(OpCodes.Ldfld, xField);

       // Now, we execute the box opcode, which pops the value of field 'x',
       // returning a reference to the integer value boxed as an object.

       writeStrIL.Emit(OpCodes.Box, typeof(int));

       // Atop the stack, you'll find our string inStr, followed by a reference
       // to the boxed value of 'x'. Now, you need to likewise box field 'y'.

       writeStrIL.Emit(OpCodes.Ldarg_0);
       writeStrIL.Emit(OpCodes.Ldfld, yField);
       writeStrIL.Emit(OpCodes.Box, typeof(int));

       // Now, you have all of the arguments for your call to
       // Console.WriteLine(string, object, object) atop the stack:
       // the string InStr, a reference to the boxed value of 'x', and
       // a reference to the boxed value of 'y'.

       // Call Console.WriteLine(string, object, object) with EmitCall.

       writeStrIL.EmitCall(OpCodes.Call, writeLineMI, null);

       // Lastly, EmitWriteLine can also output the value of a field
       // using the overload EmitWriteLine(FieldInfo).

       writeStrIL.EmitWriteLine("The value of 'x' is:");
       writeStrIL.EmitWriteLine(xField);
       writeStrIL.EmitWriteLine("The value of 'y' is:");
       writeStrIL.EmitWriteLine(yField);

       // Since we return no value (void), the ret opcode will not
       // return the top stack value.

       writeStrIL.Emit(OpCodes.Ret);

       return pointTypeBld.CreateType();
   }

   public static void Main() {

      object[] ctorParams = new object[2];

      Console.Write("Enter a integer value for X: ");
      string myX = Console.ReadLine();
      Console.Write("Enter a integer value for Y: ");
      string myY = Console.ReadLine();

      Console.WriteLine("---");

      ctorParams[0] = Convert.ToInt32(myX);
      ctorParams[1] = Convert.ToInt32(myY);

      Type ptType = CreateDynamicType();

      object ptInstance = Activator.CreateInstance(ptType, ctorParams);
      ptType.InvokeMember("WritePoint",
              BindingFlags.InvokeMethod,
              null,
              ptInstance,
              new object[0]);
   }
}


Imports System.Threading
Imports System.Reflection
Imports System.Reflection.Emit

 _

Class EmitWriteLineDemo
   
   
   Public Shared Function CreateDynamicType() As Type

      Dim ctorParams() As Type = {GetType(Integer), GetType(Integer)}
      
      Dim myDomain As AppDomain = Thread.GetDomain()
      Dim myAsmName As New AssemblyName()
      myAsmName.Name = "MyDynamicAssembly"
      
      Dim myAsmBuilder As AssemblyBuilder = myDomain.DefineDynamicAssembly(myAsmName, AssemblyBuilderAccess.RunAndSave)
      
      Dim pointModule As ModuleBuilder = myAsmBuilder.DefineDynamicModule("PointModule", "Point.dll")
      
      Dim pointTypeBld As TypeBuilder = pointModule.DefineType("Point", _
                                   TypeAttributes.Public)
      
      Dim xField As FieldBuilder = pointTypeBld.DefineField("x", _
                                GetType(Integer), _
                                FieldAttributes.Public)
      Dim yField As FieldBuilder = pointTypeBld.DefineField("y", _
                                GetType(Integer), _
                                FieldAttributes.Public)
      
      
      Dim objType As Type = Type.GetType("System.Object")
      Dim objCtor As ConstructorInfo = objType.GetConstructor(New Type(){})
      
      Dim pointCtor As ConstructorBuilder = pointTypeBld.DefineConstructor( _
                             MethodAttributes.Public, _
                             CallingConventions.Standard, _
                             ctorParams)
      Dim ctorIL As ILGenerator = pointCtor.GetILGenerator()
      
      
      ' First, you build the constructor.

      ctorIL.Emit(OpCodes.Ldarg_0)
      ctorIL.Emit(OpCodes.Call, objCtor)
      ctorIL.Emit(OpCodes.Ldarg_0)
      ctorIL.Emit(OpCodes.Ldarg_1)
      ctorIL.Emit(OpCodes.Stfld, xField)
      ctorIL.Emit(OpCodes.Ldarg_0)
      ctorIL.Emit(OpCodes.Ldarg_2)
      ctorIL.Emit(OpCodes.Stfld, yField)
      ctorIL.Emit(OpCodes.Ret)
      
      '  Now, you'll build a method to output some information on the
      ' inside your dynamic class. This method will have the following
      ' definition in C#:
      '  Public Sub WritePoint() 

      Dim writeStrMthd As MethodBuilder = pointTypeBld.DefineMethod("WritePoint", _
                                    MethodAttributes.Public, _
                                    Nothing, Nothing)
      
      Dim writeStrIL As ILGenerator = writeStrMthd.GetILGenerator()
      
      ' The below ILGenerator created demonstrates a few ways to create
      ' string output through STDIN. 
      ' ILGenerator.EmitWriteLine(string) will generate a ldstr and a 
      ' call to WriteLine for you.

      writeStrIL.EmitWriteLine("The value of this current instance is:")
      
      ' Here, you will do the hard work yourself. First, you need to create
      ' the string we will be passing and obtain the correct WriteLine overload
      ' for said string. In the below case, you are substituting in two values,
      ' so the chosen overload is Console.WriteLine(string, object, object).

      Dim inStr As [String] = "({0}, {1})"
      Dim wlParams() As Type = {GetType(String), GetType(Object), GetType(Object)}
      
      ' We need the MethodInfo to pass into EmitCall later.

      Dim writeLineMI As MethodInfo = GetType(Console).GetMethod("WriteLine", wlParams)
      
      ' Push the string with the substitutions onto the stack.
      ' This is the first argument for WriteLine - the string one. 

      writeStrIL.Emit(OpCodes.Ldstr, inStr)
      
      ' Since the second argument is an object, and it corresponds to
      ' to the substitution for the value of our integer field, you 
      ' need to box that field to an object. First, push a reference
      ' to the current instance, and then push the value stored in
      ' field 'x'. We need the reference to the current instance (stored
      ' in local argument index 0) so Ldfld can load from the correct
      ' instance (this one).

      writeStrIL.Emit(OpCodes.Ldarg_0)
      writeStrIL.Emit(OpCodes.Ldfld, xField)
      
      ' Now, we execute the box opcode, which pops the value of field 'x',
      ' returning a reference to the integer value boxed as an object.

      writeStrIL.Emit(OpCodes.Box, GetType(Integer))
      
      ' Atop the stack, you'll find our string inStr, followed by a reference
      ' to the boxed value of 'x'. Now, you need to likewise box field 'y'.

      writeStrIL.Emit(OpCodes.Ldarg_0)
      writeStrIL.Emit(OpCodes.Ldfld, yField)
      writeStrIL.Emit(OpCodes.Box, GetType(Integer))
      
      ' Now, you have all of the arguments for your call to
      ' Console.WriteLine(string, object, object) atop the stack:
      ' the string InStr, a reference to the boxed value of 'x', and
      ' a reference to the boxed value of 'y'.
      ' Call Console.WriteLine(string, object, object) with EmitCall.

      writeStrIL.EmitCall(OpCodes.Call, writeLineMI, Nothing)
      
      ' Lastly, EmitWriteLine can also output the value of a field
      ' using the overload EmitWriteLine(FieldInfo).

      writeStrIL.EmitWriteLine("The value of 'x' is:")
      writeStrIL.EmitWriteLine(xField)
      writeStrIL.EmitWriteLine("The value of 'y' is:")
      writeStrIL.EmitWriteLine(yField)
      
      ' Since we return no value (void), the ret opcode will not
      ' return the top stack value.

      writeStrIL.Emit(OpCodes.Ret)
      
      Return pointTypeBld.CreateType()

   End Function 'CreateDynamicType
    
   
   Public Shared Sub Main()
      
      Dim ctorParams(1) As Object
      
      Console.Write("Enter a integer value for X: ")
      Dim myX As String = Console.ReadLine()
      Console.Write("Enter a integer value for Y: ")
      Dim myY As String = Console.ReadLine()
      
      Console.WriteLine("---")
      
      ctorParams(0) = Convert.ToInt32(myX)
      ctorParams(1) = Convert.ToInt32(myY)
      
      Dim ptType As Type = CreateDynamicType()

      Dim ptInstance As Object = Activator.CreateInstance(ptType, ctorParams)

      ptType.InvokeMember("WritePoint", _
              BindingFlags.InvokeMethod, _
              Nothing, ptInstance, Nothing)

   End Sub

End Class

Remarques

Le type de localBuilder doit correspondre au type de paramètre d’une surcharge de la Console.WriteLine méthode .

S’applique à