TypeBuilder.MakeByRefType Metodo

Definizione

Spazio dei nomi:

System.Reflection.Emit

Assembly:

System.Reflection.Emit.dll

Origine:

TypeBuilder.cs

Restituisce un oggetto Type che rappresenta il tipo corrente quando viene passato come parametro ref (ByRef in Visual Basic).

public:
 override Type ^ MakeByRefType();

public override Type MakeByRefType ();

override this.MakeByRefType : unit -> Type

Public Overrides Function MakeByRefType () As Type

Restituisce

Type

Oggetto Type che rappresenta il tipo corrente quando viene passato come parametro ref (ByRef in Visual Basic).

Esempio

Nell'esempio di codice seguente viene creato un modulo dinamico, un tipo astratto denominato Samplee un metodo astratto denominato TestMethod. TestMethod accetta un ref parametro (ByRef in Visual Basic) di tipo Sample, un puntatore al tipo Samplee una matrice di tipo Sample. Restituisce una matrice bidimensionale di tipo Sample. L'esempio di codice salva il modulo dinamico su disco, in modo da poterlo esaminare con il Ildasm.exe (Disassembler IL).

using System;
using System.Reflection;
using System.Reflection.Emit;
using Microsoft.VisualBasic;

public class Example
{
    public static void Main()
    {
        // Define a dynamic assembly to contain the sample type. The
        // assembly will not be run, but only saved to disk, so
        // AssemblyBuilderAccess.Save is specified.
        //
        AppDomain myDomain = AppDomain.CurrentDomain;
        AssemblyName myAsmName = new AssemblyName("MakeXxxTypeExample");
        AssemblyBuilder myAssembly = myDomain.DefineDynamicAssembly(
            myAsmName,
            AssemblyBuilderAccess.Save);

        // An assembly is made up of executable modules. For a single-
        // module assembly, the module name and file name are the same
        // as the assembly name.
        //
        ModuleBuilder myModule = myAssembly.DefineDynamicModule(
            myAsmName.Name,
            myAsmName.Name + ".dll");

        // Define the sample type.
        TypeBuilder myType = myModule.DefineType(
            "Sample",
            TypeAttributes.Public | TypeAttributes.Abstract);

        // Define a method that takes a ref argument of type Sample,
        // a pointer to type Sample, and an array of Sample objects. The
        // method returns a two-dimensional array of Sample objects.
        //
        // To create this method, you need Type objects that represent the
        // parameter types and the return type. Use the MakeByRefType,
        // MakePointerType, and MakeArrayType methods to create the Type
        // objects.
        //
        Type byRefMyType = myType.MakeByRefType();
        Type pointerMyType = myType.MakePointerType();
        Type arrayMyType = myType.MakeArrayType();
        Type twoDimArrayMyType = myType.MakeArrayType(2);

        // Create the array of parameter types.
        Type[] parameterTypes = {byRefMyType, pointerMyType, arrayMyType};

        // Define the abstract Test method. After you have compiled
        // and run this code example code, you can use ildasm.exe
        // to open MakeXxxTypeExample.dll, examine the Sample type,
        // and verify the parameter types and return type of the
        // TestMethod method.
        //
        MethodBuilder myMethodBuilder = myType.DefineMethod(
            "TestMethod",
            MethodAttributes.Abstract | MethodAttributes.Virtual
                | MethodAttributes.Public,
            twoDimArrayMyType,
            parameterTypes);

        // Create the type and save the assembly. For a single-file
        // assembly, there is only one module to store the manifest
        // information in.
        //
        myType.CreateType();
        myAssembly.Save(myAsmName.Name + ".dll");
    }
}

Imports System.Reflection
Imports System.Reflection.Emit

Public Class Example
    Public Shared Sub Main()
        ' Define a dynamic assembly to contain the sample type. The
        ' assembly will not be run, but only saved to disk, so
        ' AssemblyBuilderAccess.Save is specified.
        '
        Dim myDomain As AppDomain = AppDomain.CurrentDomain
        Dim myAsmName As New AssemblyName("MakeXxxTypeExample")
        Dim myAssembly As AssemblyBuilder = myDomain.DefineDynamicAssembly( _
            myAsmName, _
            AssemblyBuilderAccess.Save)

        ' An assembly is made up of executable modules. For a single-
        ' module assembly, the module name and file name are the same 
        ' as the assembly name. 
        '
        Dim myModule As ModuleBuilder = myAssembly.DefineDynamicModule( _
            myAsmName.Name, _
            myAsmName.Name & ".dll")

        ' Define the sample type.
        Dim myType As TypeBuilder = myModule.DefineType( _
            "Sample", _
            TypeAttributes.Public Or TypeAttributes.Abstract)

        ' Define a method that takes a ByRef argument of type Sample,
        ' a pointer to type Sample, and an array of Sample objects. The
        ' method returns a two-dimensional array of Sample objects.
        '
        ' To create this method, you need Type objects that represent the
        ' parameter types and the return type. Use the MakeByRefType, 
        ' MakePointerType, and MakeArrayType methods to create the Type
        ' objects.
        '
        Dim byRefMyType As Type = myType.MakeByRefType
        Dim pointerMyType As Type = myType.MakePointerType
        Dim arrayMyType As Type = myType.MakeArrayType
        Dim twoDimArrayMyType As Type = myType.MakeArrayType(2)

        ' Create the array of parameter types.
        Dim parameterTypes() As Type = _
            {byRefMyType, pointerMyType, arrayMyType}

        ' Define the abstract Test method. After you have compiled
        ' and run this code example code, you can use ildasm.exe 
        ' to open MakeXxxTypeExample.dll, examine the Sample type,
        ' and verify the parameter types and return type of the
        ' TestMethod method.
        '
        Dim myMethodBuilder As MethodBuilder = myType.DefineMethod( _
            "TestMethod", _
            MethodAttributes.Abstract Or MethodAttributes.Virtual _
                Or MethodAttributes.Public, _
            twoDimArrayMyType, _
            parameterTypes)

        ' Create the type and save the assembly. For a single-file 
        ' assembly, there is only one module to store the manifest 
        ' information in.
        '
        myType.CreateType()
        myAssembly.Save(myAsmName.Name & ".dll")

    End Sub
End Class

Commenti

Il MakeByRefType metodo consente di generare ref tipi (ByRef in Visual Basic) per gli elenchi di parametri.

Nota

Usando la sintassi MSIL (Microsoft Intermediate Language), se l'oggetto corrente TypeBuilder rappresenta MyType, il tipo restituito da questo metodo sarà MyType&.

Vedi anche

• MakeArrayType
• MakePointerType()