TypeBuilder.DefineDefaultConstructor(MethodAttributes) 方法

  • 參考

定義

命名空間:
System.Reflection.Emit
組件:
System.Reflection.Emit.dll
組件:
netstandard.dll
組件:
mscorlib.dll

定義無參數建構函式。 這裡所定義建構函式只會呼叫父代的無參數建構函式。

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.ConstructorBuilder
Public Function DefineDefaultConstructor (attributes As MethodAttributes) As ConstructorBuilder

參數

attributes
MethodAttributes

表示要套用至建構函式之屬性的 MethodAttributes 物件。

傳回

ConstructorBuilder

傳回建構函式。

屬性
ComVisibleAttribute

例外狀況

NotSupportedException

父類型 (基底類型) 沒有無參數建構函式。

InvalidOperationException

先前使用 CreateType() 建立的類型。

-或- 目前動態類型的 IsGenericType 屬性為 true，但 IsGenericTypeDefinition 屬性為 false。

範例

下列程式碼範例將示範如何使用 DefineConstructor 來設定動態類型的函式的特定簽章和屬性，並傳回對應 ConstructorBuilder 的 MSIL 擴展。

// 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)

備註

由於自動定義無參數的函式，因此只有在下列情況下才需要呼叫此方法：

適用於