ProxyAttribute Класс

Определение

public ref class ProxyAttribute : Attribute, System::Runtime::Remoting::Contexts::IContextAttribute

[System.AttributeUsage(System.AttributeTargets.Class, AllowMultiple=false, Inherited=true)]
public class ProxyAttribute : Attribute, System.Runtime.Remoting.Contexts.IContextAttribute

[System.AttributeUsage(System.AttributeTargets.Class, AllowMultiple=false, Inherited=true)]
[System.Runtime.InteropServices.ComVisible(true)]
public class ProxyAttribute : Attribute, System.Runtime.Remoting.Contexts.IContextAttribute

[System.AttributeUsage(System.AttributeTargets.Class, AllowMultiple=false, Inherited=true)]
[System.Runtime.InteropServices.ComVisible(true)]
[System.Security.SecurityCritical]
public class ProxyAttribute : Attribute, System.Runtime.Remoting.Contexts.IContextAttribute

[<System.AttributeUsage(System.AttributeTargets.Class, AllowMultiple=false, Inherited=true)>]
type ProxyAttribute = class
    inherit Attribute
    interface IContextAttribute

[<System.AttributeUsage(System.AttributeTargets.Class, AllowMultiple=false, Inherited=true)>]
[<System.Runtime.InteropServices.ComVisible(true)>]
type ProxyAttribute = class
    inherit Attribute
    interface IContextAttribute

[<System.AttributeUsage(System.AttributeTargets.Class, AllowMultiple=false, Inherited=true)>]
[<System.Runtime.InteropServices.ComVisible(true)>]
[<System.Security.SecurityCritical>]
type ProxyAttribute = class
    inherit Attribute
    interface IContextAttribute

Public Class ProxyAttribute
Inherits Attribute
Implements IContextAttribute

Наследование

Object

Attribute

ProxyAttribute

Атрибуты

AttributeUsageAttribute ComVisibleAttribute SecurityCriticalAttribute

Реализации

IContextAttribute

Примеры

[AttributeUsageAttribute(AttributeTargets::Class)]
[System::Security::Permissions::SecurityPermissionAttribute
(System::Security::Permissions::SecurityAction::LinkDemand,
Flags=System::Security::Permissions::SecurityPermissionFlag::Infrastructure)]
[System::Security::Permissions::SecurityPermissionAttribute
(System::Security::Permissions::SecurityAction::InheritanceDemand,
Flags=System::Security::Permissions::SecurityPermissionFlag::Infrastructure)]
public ref class MyProxyAttribute: public ProxyAttribute
{
public:
   MyProxyAttribute(){}

   // Create an instance of ServicedComponentProxy
   virtual MarshalByRefObject^ CreateInstance( Type^ serverType ) override
   {
      return ProxyAttribute::CreateInstance( serverType );
   }

   virtual RealProxy^ CreateProxy( ObjRef^ objRef1, Type^ serverType, Object^ serverObject, Context^ serverContext ) override
   {
      MyProxy^ myCustomProxy = gcnew MyProxy( serverType );
      if ( serverContext != nullptr )
      {
         RealProxy::SetStubData( myCustomProxy, serverContext );
      }

      if ( ( !serverType->IsMarshalByRef) && (serverContext == nullptr) )
      {
         throw gcnew RemotingException( "Bad Type for CreateProxy" );
      }

      return myCustomProxy;
   }
};

[MyProxyAttribute]
ref class CustomServer: public ContextBoundObject
{
public:
   CustomServer()
   {
      Console::WriteLine( "CustomServer Base Class constructor called" );
   }

   void HelloMethod( String^ str )
   {
      Console::WriteLine( "HelloMethod of Server is invoked with message : {0}", str );
   }
};

[AttributeUsage(AttributeTargets.Class)]
public class MyProxyAttribute : ProxyAttribute
{
   public MyProxyAttribute()
   {
   }
   // Create an instance of ServicedComponentProxy
   public override MarshalByRefObject CreateInstance(Type serverType)
   {
      return base.CreateInstance(serverType);
   }
   public override RealProxy CreateProxy(ObjRef objRef1,
      Type serverType,
      object serverObject,
      Context serverContext)
   {
      MyProxy myCustomProxy = new MyProxy(serverType);
      if(serverContext != null)
      {
         RealProxy.SetStubData(myCustomProxy,serverContext);
      }
      if((!serverType.IsMarshalByRef)&&(serverContext == null))
      {
         throw new RemotingException("Bad Type for CreateProxy");
      }
      return myCustomProxy;
   }
}
[MyProxyAttribute]
public class CustomServer :ContextBoundObject
{
   public CustomServer()
   {
      Console.WriteLine("CustomServer Base Class constructor called");
   }
   public void HelloMethod(string str)
   {
      Console.WriteLine("HelloMethod of Server is invoked with message : " + str);
   }
}

<SecurityPermissionAttribute(SecurityAction.Demand, Flags := SecurityPermissionFlag.Infrastructure), _
AttributeUsage(AttributeTargets.Class)>  _
Public Class MyProxyAttribute
   Inherits ProxyAttribute

   Public Sub New()
   End Sub

   ' Create an instance of ServicedComponentProxy
   Public Overrides Function CreateInstance(serverType As Type) As MarshalByRefObject
      Return MyBase.CreateInstance(serverType)
   End Function 'CreateInstance

   Public Overrides Function CreateProxy(objRef1 As ObjRef, serverType As Type, _
               serverObject As Object, serverContext As Context) As RealProxy
      Dim myCustomProxy As New MyProxy(serverType)
      If Not (serverContext Is Nothing) Then
         RealProxy.SetStubData(myCustomProxy, serverContext)
      End If
      If Not serverType.IsMarshalByRef And serverContext Is Nothing Then
         Throw New RemotingException("Bad Type for CreateProxy")
      End If
      Return myCustomProxy
   End Function 'CreateProxy
End Class

<MyProxyAttribute()> _
Public Class CustomServer
   Inherits ContextBoundObject

   Public Sub New()
      Console.WriteLine("CustomServer Base Class constructor called")
   End Sub

   Public Sub HelloMethod(str As String)
      Console.WriteLine("HelloMethod of Server is invoked with message : " + str)
   End Sub
End Class

Комментарии

Примените текущий атрибут к типам, которым требуются пользовательские прокси-серверы. Класс ProxyAttribute можно использовать для перехвата new оператора (New в Visual Basic), производного от ProxyAttribute и размещения атрибута в дочернем элементе ContextBoundObject. (Размещение атрибута прокси-сервера в дочернем элементе MarshalByRefObject не поддерживается.)

См. также раздел

• RealProxy