ExtensibleClassFactory 类

项目
08/17/2007

在创建过程中启用从非托管对象扩展的托管对象的自定义。

**命名空间:**System.Runtime.InteropServices
**程序集:**mscorlib（在 mscorlib.dll 中）

语法

声明
<ComVisibleAttribute(True)> _
Public NotInheritable Class ExtensibleClassFactory
用法
Dim instance As ExtensibleClassFactory

[ComVisibleAttribute(true)] 
public sealed class ExtensibleClassFactory

[ComVisibleAttribute(true)] 
public ref class ExtensibleClassFactory sealed

/** @attribute ComVisibleAttribute(true) */ 
public final class ExtensibleClassFactory

ComVisibleAttribute(true) 
public final class ExtensibleClassFactory

备注

ExtensibleClassFactory 允许用户指定构造运行库可调用包装 (RCW) 过程中调用的 delegate，RCW 提供基础 COM 对象的实例。实际上，回调充当由 RCW 包装的 COM 对象的类工厂。如果没有回调，公共语言运行库通过调用 CoCreateInstance 创建基础 COM 对象。此回调提供了一种激活基础对象的可选方式，例如用 COM 名字对象或通过提供 singleton 对象。RegisterObjectCreationCallback 方法必须在扩展 RCW 的类的 static 初始值设定项中调用。每个对象类型只允许一个对象创建回调。当激活可扩展的 RCW 时，对回调进行注册。当需要创建基础 COM 对象时，调用回调以提供对该对象的引用。回调必须为基对象返回 IUnknown 接口指针。

示例

注册一个 delegate，每次从非托管类型扩展的托管类型的实例需要分配聚合的非托管对象时，都要调用该委托。该 delegate 应该分配和聚合非托管对象，调用它以代替 CoCreateInstance。此例程必须在要为其进行回调的类的 static 初始值设定项的上下文中调用。

Imports System
Imports System.Runtime.InteropServices

Public Class CallBack
    
    Public Function Activate(Aggregator As IntPtr) As IntPtr
        Dim oCOM As New ECFSRV32Lib.ObjectActivator()
        Dim itf As ECFSRV32Lib.IObjectActivator = _
           CType(oCOM, ECFSRV32Lib.IObjectActivator)
        Return New IntPtr(itf.CreateBaseComponent(Aggregator.ToInt32()))
    End Function
End Class

'
' The EcfInner class. First .NET class derived directly from COM class.
'
Public Class EcfInner
    Inherits ECFSRV32Lib.BaseComponent
    Private Shared callbackInner As CallBack    
    
    Shared Sub RegisterInner()
        callbackInner = New CallBack()
        ExtensibleClassFactory.RegisterObjectCreationCallback( _
           New System.Runtime.InteropServices.ObjectCreationDelegate( _
           AddressOf callbackInner.Activate))
    End Sub    
    
    'This is the static initializer.    
    Shared Sub New()
        RegisterInner()
    End Sub
End Class

using System;
using System.Runtime.InteropServices;

public class CallBack
{
   public IntPtr Activate(IntPtr Aggregator)
   {
      ECFSRV32Lib.ObjectActivator oCOM = new ECFSRV32Lib.ObjectActivator();
      ECFSRV32Lib.IObjectActivator itf = (ECFSRV32Lib.IObjectActivator)oCOM;
      return (IntPtr) itf.CreateBaseComponent((int)Aggregator);
   }
}

//
// The EcfInner class. First .NET class derived directly from COM class.
//
public class EcfInner : ECFSRV32Lib.BaseComponent
{
   static CallBack callbackInner;

   static void RegisterInner()
   {      
      callbackInner = new CallBack();
      System.Runtime.InteropServices.ExtensibleClassFactory.RegisterObjectCreationCallback(new System.Runtime.InteropServices.ObjectCreationDelegate(callbackInner.Activate));
   }

   //This is the static initializer.    
   static EcfInner()
   {
      RegisterInner();
   }
}

public ref class CallBack
{
public:
   IntPtr Activate( IntPtr Aggregator )
   {
      ECFSRV32Lib::ObjectActivator^ oCOM = gcnew ECFSRV32Lib::ObjectActivator;
      ECFSRV32Lib::IObjectActivator^ itf = dynamic_cast<ECFSRV32Lib::IObjectActivator^>(oCOM);
      return (IntPtr)itf->CreateBaseComponent( (int)Aggregator );
   }
};

//
// The EcfInner class. First .NET class derived directly from COM class.
//
public ref class EcfInner: public ECFSRV32Lib::BaseComponent
{
private:
   static CallBack^ callbackInner;
   static void RegisterInner()
   {
      callbackInner = gcnew CallBack;
      System::Runtime::InteropServices::ExtensibleClassFactory::RegisterObjectCreationCallback( gcnew System::Runtime::InteropServices::ObjectCreationDelegate( callbackInner, &CallBack::Activate ) );
   }

   //This is the static initializer.    
   static EcfInner()
   {
      RegisterInner();
   }
};

package ECFSRV32Lib;

import System.*;
import System.Runtime.InteropServices.*;

public class CallBack
{
    public IntPtr Activate(IntPtr Aggregator)
    {
        ECFSRV32Lib.ObjectActivator oCOM = new ECFSRV32Lib.ObjectActivator();
        ECFSRV32Lib.IObjectActivator iTf= (ECFSRV32Lib.IObjectActivator)(oCOM);
        return (new IntPtr(iTf.CreateBaseComponent((Aggregator).ToInt32())));
    } //Activate
} //CallBack

//
// The EcfInner class. First .NET class derived directly from COM class.
//
public class EcfInner extends ECFSRV32Lib.BaseComponent
{
    private static CallBack callbackInner;

    static void RegisterInner()
    {
        callbackInner = new CallBack();
        System.Runtime.InteropServices.ExtensibleClassFactory.
            RegisterObjectCreationCallback(new System.Runtime.
            InteropServices.ObjectCreationDelegate(callbackInner.Activate));
    } //RegisterInner
    
   //This is the static initializer.    
    static 
    {
        RegisterInner();
    } //EcfInner
} //EcfInner

继承层次结构

System.Object
System.Runtime.InteropServices.ExtensibleClassFactory

线程安全

此类型的任何公共静态（Visual Basic 中的 Shared）成员都是线程安全的，但不保证所有实例成员都是线程安全的。

平台

Windows 98、Windows 2000 SP4、Windows Millennium Edition、Windows Server 2003、Windows XP Media Center Edition、Windows XP Professional x64 Edition、Windows XP SP2、Windows XP Starter Edition

.NET Framework 并不是对每个平台的所有版本都提供支持。有关受支持版本的列表，请参见系统要求。

ExtensibleClassFactory 类

语法

备注

示例

继承层次结构

线程安全

平台

版本信息

.NET Framework

请参见

参考

其他资源