TypeBuilder.DefineDefaultConstructor(MethodAttributes) Method
Definition
Important
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Defines the parameterless constructor. The constructor defined here will simply call the parameterless constructor of the parent.
public:
System::Reflection::Emit::ConstructorBuilder ^ DefineDefaultConstructor(System::Reflection::MethodAttributes attributes);public System.Reflection.Emit.ConstructorBuilder DefineDefaultConstructor (System.Reflection.MethodAttributes attributes);[System.Runtime.InteropServices.ComVisible(true)]
public System.Reflection.Emit.ConstructorBuilder DefineDefaultConstructor (System.Reflection.MethodAttributes attributes);member this.DefineDefaultConstructor : System.Reflection.MethodAttributes -> System.Reflection.Emit.ConstructorBuilder[<System.Runtime.InteropServices.ComVisible(true)>]
member this.DefineDefaultConstructor : System.Reflection.MethodAttributes -> System.Reflection.Emit.ConstructorBuilderPublic Function DefineDefaultConstructor (attributes As MethodAttributes) As ConstructorBuilderParameters
- attributes
- MethodAttributes
A MethodAttributes object representing the attributes to be applied to the constructor.
Returns
Returns the constructor.
- Attributes
Exceptions
The parent type (base type) does not have a parameterless constructor.
The type was previously created using CreateType().
-or-
For the current dynamic type, the IsGenericType property is true, but the IsGenericTypeDefinition property is false.
Examples
The following code sample demonstrates the use of DefineConstructor to set a constructor's particular signature and attributes on a dynamic type and return a corresponding ConstructorBuilder for MSIL population.
// Define the constructor.
array<Type^>^ constructorArgs = {String::typeid};
ConstructorBuilder^ myConstructorBuilder =
helloWorldTypeBuilder->DefineConstructor( MethodAttributes::Public,
CallingConventions::Standard, constructorArgs );
// Generate IL for the method. The constructor stores its argument in the private field.
ILGenerator^ myConstructorIL = myConstructorBuilder->GetILGenerator();
myConstructorIL->Emit( OpCodes::Ldarg_0 );
myConstructorIL->Emit( OpCodes::Ldarg_1 );
myConstructorIL->Emit( OpCodes::Stfld, myGreetingField );
myConstructorIL->Emit( OpCodes::Ret );
// Define the constructor.
Type[] constructorArgs = { typeof(String) };
ConstructorBuilder myConstructorBuilder =
helloWorldTypeBuilder.DefineConstructor(MethodAttributes.Public,
CallingConventions.Standard, constructorArgs);
// Generate IL for the method. The constructor stores its argument in the private field.
ILGenerator myConstructorIL = myConstructorBuilder.GetILGenerator();
myConstructorIL.Emit(OpCodes.Ldarg_0);
myConstructorIL.Emit(OpCodes.Ldarg_1);
myConstructorIL.Emit(OpCodes.Stfld, myGreetingField);
myConstructorIL.Emit(OpCodes.Ret);
' Define the constructor.
Dim constructorArgs As Type() = {GetType(String)}
Dim myConstructorBuilder As ConstructorBuilder = helloWorldTypeBuilder.DefineConstructor _
(MethodAttributes.Public, CallingConventions.Standard, constructorArgs)
' Generate IL for the method. The constructor stores its argument in the private field.
Dim myConstructorIL As ILGenerator = myConstructorBuilder.GetILGenerator()
myConstructorIL.Emit(OpCodes.Ldarg_0)
myConstructorIL.Emit(OpCodes.Ldarg_1)
myConstructorIL.Emit(OpCodes.Stfld, myGreetingField)
myConstructorIL.Emit(OpCodes.Ret)
Remarks
Because the parameterless constructor is automatically defined, it is necessary to call this method only in the following situations:
You have defined another constructor and you also want a parameterless constructor that simply calls the base class constructor.
You want to set the attributes on the parameterless constructor to something other than PrivateScope, Public, HideBySig, SpecialName, and RTSpecialName.
