ProxyAttribute Class
Indicates that an object type requires a custom proxy.
Assembly: mscorlib (in mscorlib.dll)
'Declaration <AttributeUsageAttribute(AttributeTargets.Class, AllowMultiple := False, Inherited := True)> _ <ComVisibleAttribute(True)> _ <SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags := SecurityPermissionFlag.Infrastructure)> _ <SecurityPermissionAttribute(SecurityAction.InheritanceDemand, Flags := SecurityPermissionFlag.Infrastructure)> _ Public Class ProxyAttribute _ Inherits Attribute _ Implements IContextAttribute 'Usage Dim instance As ProxyAttribute
Apply the current attribute to types that need custom proxies. You can use the ProxyAttribute class to intercept the new (New in Visual Basic) statement by deriving from the ProxyAttribute and placing the attribute on a child of ContextBoundObject. (Placing the proxy attribute on a child of MarshalByRefObject is not supported.)
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This class makes a link demand and an inheritance demand at the class level. A SecurityException is thrown when either the immediate caller or the derived class does not have infrastructure permission. For details about security demands, see Link Demands and Inheritance Demands. |
<SecurityPermissionAttribute(SecurityAction.Demand, Flags := SecurityPermissionFlag.Infrastructure), _ AttributeUsage(AttributeTargets.Class)> _ Public Class MyProxyAttribute Inherits ProxyAttribute Public Sub New() End Sub 'New ' 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 <MyProxyAttribute()> _ Public Class CustomServer Inherits ContextBoundObject Public Sub New() Console.WriteLine("CustomServer Base Class constructor called") End Sub 'New Public Sub HelloMethod(str As String) Console.WriteLine("HelloMethod of Server is invoked with message : " + str) End Sub 'HelloMethod End Class 'CustomServer
[AttributeUsage(AttributeTargets::Class)]
[System::Security::Permissions::SecurityPermissionAttribute(System::Security::Permissions::SecurityAction::Demand, Flags=SecurityPermissionFlag::Infrastructure)]
public __gc class MyProxyAttribute : public ProxyAttribute
{
public:
MyProxyAttribute()
{
}
// Create an instance of ServicedComponentProxy
public:
MarshalByRefObject* CreateInstance(Type* serverType)
{
return ProxyAttribute::CreateInstance(serverType);
}
public:
RealProxy* CreateProxy(ObjRef* objRef1,
Type* serverType,
Object* serverObject,
Context* serverContext)
{
MyProxy* myCustomProxy = new MyProxy(serverType);
if (serverContext != 0)
{
RealProxy::SetStubData(myCustomProxy, serverContext);
}
if ((!serverType->IsMarshalByRef)&&(serverContext == 0)) {
throw new RemotingException(S"Bad Type for CreateProxy");
}
return myCustomProxy;
}
};
[MyProxyAttribute]
__gc class CustomServer : public ContextBoundObject
{
public:
CustomServer()
{
Console::WriteLine(S"CustomServer Base Class constructor called");
}
public:
void HelloMethod(String* str) {
Console::WriteLine(S"HelloMethod of Server is invoked with message : {0}", str);
}
};
- SecurityPermission
For operating with infrastructure code. Demand value: SecurityAction.LinkDemand; Permission Value: SecurityPermissionFlag.Infrastructure
- SecurityPermission
For operating with infrastructure code. Demand value: SecurityAction.InheritanceDemand; Permission Value: SecurityPermissionFlag.Infrastructure
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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