TypeBuilder.CreateType Método

public:
 Type ^ CreateType();

public Type? CreateType ();

public Type CreateType ();

member this.CreateType : unit -> Type

Public Function CreateType () As Type

Devoluciones

Devuelve el nuevo objeto Type para esta clase.

Excepciones

Ejemplos

En el ejemplo de código siguiente se muestra cómo definir un controlador de eventos para el AppDomain.TypeResolve evento, con el fin de llamar al CreateType método en un tipo anidado durante una CreateType llamada en el tipo envolvente.

using namespace System;
using namespace System::Reflection;
using namespace System::Reflection::Emit;
using namespace System::Threading;
using namespace System::Text;
using namespace System::Resources;
using namespace System::Collections;
using namespace System::IO;

// Helper class called when a resolve type event is raised.
ref class TypeResolveHandler
{
private:
   Module^ m_Module;

public:
   TypeResolveHandler( Module^ mod )
   {
      m_Module = mod;
   }

   Assembly^ ResolveEvent( Object^ sender, ResolveEventArgs^ args );
};

ref class NestedEnum
{
internal:
   static TypeBuilder^ enumType = nullptr;
   static Type^ tNested = nullptr;
   static Type^ tNesting = nullptr;

public:
   static void Main()
   {
      AssemblyName^ asmName = gcnew AssemblyName;
      asmName->Name = "NestedEnum";
      AssemblyBuilder^ asmBuild = Thread::GetDomain()->DefineDynamicAssembly( asmName, AssemblyBuilderAccess::RunAndSave );
      ModuleBuilder^ modBuild = asmBuild->DefineDynamicModule( "ModuleOne", "NestedEnum.dll" );
      
      // Hook up the event listening.
      TypeResolveHandler^ typeResolveHandler = gcnew TypeResolveHandler( modBuild );
      
      // Add a listener for the type resolve events.
      AppDomain^ currentDomain = Thread::GetDomain();
      ResolveEventHandler^ resolveHandler = gcnew ResolveEventHandler( typeResolveHandler, &TypeResolveHandler::ResolveEvent );
      currentDomain->TypeResolve += resolveHandler;
      TypeBuilder^ tb = modBuild->DefineType( "AType", TypeAttributes::Public );
      TypeBuilder^ eb = tb->DefineNestedType( "AnEnum", static_cast<TypeAttributes>(TypeAttributes::NestedPublic | TypeAttributes::Sealed), Enum::typeid, 0 );
      eb->DefineField( "value__", int::typeid, static_cast<FieldAttributes>(FieldAttributes::Private | FieldAttributes::SpecialName) );
      FieldBuilder^ fb = eb->DefineField( "Field1", eb, static_cast<FieldAttributes>(FieldAttributes::Public | FieldAttributes::Literal | FieldAttributes::Static) );
      fb->SetConstant( 1 );
      enumType = eb;
      
      // Comment out this field.
      // When this field is defined, the loader cannot determine the size
      // of the type. Therefore, a TypeResolve event is generated when the
      // nested type is completed.
      tb->DefineField( "Field2", eb, FieldAttributes::Public );
      tNesting = tb->CreateType();
      if ( tNesting == nullptr )
            Console::WriteLine( "NestingType CreateType failed but didn't throw!" );

      try
      {
         tNested = eb->CreateType();
         if ( tNested == nullptr )
                  Console::WriteLine( "NestedType CreateType failed but didn't throw!" );
      }
      catch ( Exception^ ) 
      {
         
         // This is needed because you might have already completed the type in the TypeResolve event.
      }

      if ( tNested != nullptr )
      {
         Type^ x = tNested->DeclaringType;
         if ( x == nullptr )
                  Console::WriteLine( "Declaring type is null." );
         else
                  Console::WriteLine( x->Name );
      }

      asmBuild->Save( "NestedEnum.dll" );
      
      // Remove the listener for the type resolve events.
      currentDomain->TypeResolve -= resolveHandler;
   }

};

Assembly^ TypeResolveHandler::ResolveEvent( Object^ sender, ResolveEventArgs^ args )
{
   Console::WriteLine( args->Name );
   
   // Use args.Name to look up the type name. In this case, you are getting AnEnum.
   try
   {
      NestedEnum::tNested = NestedEnum::enumType->CreateType();
   }
   catch ( Exception^ ) 
   {
      
      // This is needed to throw away InvalidOperationException.
      // Loader might send the TypeResolve event more than once
      // and the type might be complete already.
   }

   
   // Complete the type.
   return m_Module->Assembly;
}

int main()
{
   NestedEnum::Main();
}

using System;
using System.Reflection;
using System.Reflection.Emit;
using System.Threading;
using System.Text;
using System.Resources;
using System.Collections;
using System.IO;

internal class NestedEnum {
    internal static TypeBuilder enumType = null;
    internal static Type tNested = null;
    internal static Type tNesting = null;

    public static void Main(String[] args) {
    AssemblyName asmName = new AssemblyName();
    asmName.Name = "NestedEnum";
    AssemblyBuilder asmBuild = Thread.GetDomain().DefineDynamicAssembly(asmName, AssemblyBuilderAccess.RunAndSave);
    ModuleBuilder modBuild = asmBuild.DefineDynamicModule("ModuleOne", "NestedEnum.dll");

    // Hook up the event listening.
    TypeResolveHandler typeResolveHandler = new TypeResolveHandler(modBuild);
    // Add a listener for the type resolve events.
    AppDomain currentDomain = Thread.GetDomain();
    ResolveEventHandler resolveHandler = new ResolveEventHandler(typeResolveHandler.ResolveEvent);
    currentDomain.TypeResolve += resolveHandler;

    TypeBuilder tb = modBuild.DefineType("AType", TypeAttributes.Public);
    TypeBuilder eb = tb.DefineNestedType("AnEnum", TypeAttributes.NestedPublic | TypeAttributes.Sealed, typeof(Enum), null);
    eb.DefineField("value__", typeof(int), FieldAttributes.Private | FieldAttributes.SpecialName);
    FieldBuilder fb = eb.DefineField("Field1", eb, FieldAttributes.Public | FieldAttributes.Literal | FieldAttributes.Static);
    fb.SetConstant(1);

    enumType = eb;

    // Comment out this field.
    // When this field is defined, the loader cannot determine the size
    // of the type. Therefore, a TypeResolve event is generated when the
    // nested type is completed.
    tb.DefineField("Field2", eb, FieldAttributes.Public);

    tNesting = tb.CreateType();
    if (tNesting == null)
        Console.WriteLine("NestingType CreateType failed but didn't throw!");	

    try {
        tNested = eb.CreateType();
        if (tNested == null)
        Console.WriteLine("NestedType CreateType failed but didn't throw!");	
    }
    catch {
        // This is needed because you might have already completed the type in the TypeResolve event.
    }

    if (tNested != null) {
        Type x = tNested.DeclaringType;
        if (x == null)
        Console.WriteLine("Declaring type was null.");
        else
        Console.WriteLine(x.Name);
    }

    asmBuild.Save( "NestedEnum.dll" );

    // Remove the listener for the type resolve events.
    currentDomain.TypeResolve -= resolveHandler;
    }
}

// Helper class called when a resolve type event is raised.
internal class TypeResolveHandler
{
    private Module m_Module;

    public TypeResolveHandler(Module mod)
    {
    m_Module = mod;
    }

    public Assembly ResolveEvent(Object sender, ResolveEventArgs args)
    {
    Console.WriteLine(args.Name);
    // Use args.Name to look up the type name. In this case, you are getting AnEnum.
    try {
        NestedEnum.tNested = NestedEnum.enumType.CreateType();
    }
    catch {
        // This is needed to throw away InvalidOperationException.
        // Loader might send the TypeResolve event more than once
        // and the type might be complete already.
    }

    // Complete the type.		
    return m_Module.Assembly;
    }
}

Imports System.Reflection
Imports System.Reflection.Emit
Imports System.Threading
Imports System.Text
Imports System.Resources
Imports System.Collections
Imports System.IO

Friend Class NestedEnum
   Friend Shared enumType As TypeBuilder = Nothing
   Friend Shared tNested As Type = Nothing
   Friend Shared tNesting As Type = Nothing
   
   Public Shared Sub Main()
      Dim asmName As New AssemblyName()
      asmName.Name = "NestedEnum"
      Dim asmBuild As AssemblyBuilder = Thread.GetDomain().DefineDynamicAssembly(asmName, AssemblyBuilderAccess.RunAndSave)
      Dim modBuild As ModuleBuilder = asmBuild.DefineDynamicModule("ModuleOne", "NestedEnum.dll")
      
      ' Hook up the event listening.
      Dim typeResolveHandler As New TypeResolveHandler(modBuild)
      ' Add a listener for the type resolve events.
      Dim currentDomain As AppDomain = Thread.GetDomain()
      Dim resolveHandler As ResolveEventHandler = AddressOf typeResolveHandler.ResolveEvent
      AddHandler currentDomain.TypeResolve, resolveHandler 
      
      Dim tb As TypeBuilder = modBuild.DefineType("AType", TypeAttributes.Public)
      Dim eb As TypeBuilder = tb.DefineNestedType("AnEnum", TypeAttributes.NestedPublic Or TypeAttributes.Sealed, GetType([Enum]))
      eb.DefineField("value__", GetType(Integer), FieldAttributes.Private Or FieldAttributes.SpecialName)
      Dim fb As FieldBuilder = eb.DefineField("Field1", eb, FieldAttributes.Public Or FieldAttributes.Literal Or FieldAttributes.Static)
      fb.SetConstant(1)
      
      enumType = eb
      
      ' Comment out this field.
      ' When this field is defined, the loader cannot determine the size
      ' of the type. Therefore, a TypeResolve event is generated when the
      ' nested type is completed.
      tb.DefineField("Field2", eb, FieldAttributes.Public)
      
      tNesting = tb.CreateType()
      If tNesting Is Nothing Then
         Console.WriteLine("NestingType CreateType failed but didn't throw!")
      End If 
      Try
         tNested = eb.CreateType()
         If tNested Is Nothing Then
            Console.WriteLine("NestedType CreateType failed but didn't throw!")
         End If
      Catch
      End Try ' This is needed because you might have already completed the type in the TypeResolve event.
      
      If Not (tNested Is Nothing) Then
         Dim x As Type = tNested.DeclaringType
         If x Is Nothing Then
            Console.WriteLine("Declaring type is Nothing.")
         Else
            Console.WriteLine(x.Name)
         End If
      End If 
      asmBuild.Save("NestedEnum.dll")
      
      ' Remove the listener for the type resolve events.
      RemoveHandler currentDomain.TypeResolve, resolveHandler 
   End Sub
End Class


' Helper class called when a resolve type event is raised.
Friend Class TypeResolveHandler
   Private m_Module As [Module]
   
   
   Public Sub New([mod] As [Module])
      m_Module = [mod]
   End Sub
   
   
   Public Function ResolveEvent(sender As [Object], args As ResolveEventArgs) As [Assembly]
      Console.WriteLine(args.Name)
      ' Use args.Name to look up the type name. In this case, you are getting AnEnum.
      Try
         NestedEnum.tNested = NestedEnum.enumType.CreateType()
      Catch
      End Try ' This is needed to throw away InvalidOperationException.
      ' Loader might send the TypeResolve event more than once
      ' and the type might be complete already.
      
      ' Complete the type.		    
      Return m_Module.Assembly
   End Function 'ResolveEvent
End Class

Comentarios

Si este tipo es un tipo anidado, se debe llamar al CreateType método en el tipo envolvente antes de llamarlo en el tipo anidado.

Si el tipo actual se deriva de un tipo incompleto o implementa interfaces incompletas, llame al CreateType método en el tipo primario y a los tipos de interfaz antes de llamarlo en el tipo actual.

Si el tipo envolvente contiene un campo que es un tipo de valor definido como un tipo anidado (por ejemplo, un campo que es una enumeración definida como un tipo anidado), llamar al CreateType método en el tipo envolvente generará un AppDomain.TypeResolve evento. Esto se debe a que el cargador no puede determinar el tamaño del tipo envolvente hasta que se haya completado el tipo anidado. El llamador debe definir un controlador para que el TypeResolve evento complete la definición del tipo anidado llamando CreateType al TypeBuilder objeto que representa el tipo anidado. En el ejemplo de código de este tema se muestra cómo definir este tipo de controlador de eventos.

Un tipo se crea solo una vez, independientemente de cuántas veces se llame al CreateType método. Todas las llamadas devuelven el mismo Type objeto.

Se aplica a