แก้ไข

แชร์ผ่าน

ObjRef Constructors

  • Reference

Definition

Namespace:
System.Runtime.Remoting
Assembly:
mscorlib.dll

Initializes a new instance of the ObjRef class.

Overloads

ObjRef()

Initializes a new instance of the ObjRef class with default values.
ObjRef(MarshalByRefObject, Type)

Initializes a new instance of the ObjRef class to reference a specified MarshalByRefObject of a specified Type.
ObjRef(SerializationInfo, StreamingContext)

Initializes a new instance of the ObjRef class from serialized data.

ObjRef()

Initializes a new instance of the ObjRef class with default values.

public:
 ObjRef();
public ObjRef ();
Public Sub New ()

Applies to

ObjRef(MarshalByRefObject, Type)

Initializes a new instance of the ObjRef class to reference a specified MarshalByRefObject of a specified Type.

public:
 ObjRef(MarshalByRefObject ^ o, Type ^ requestedType);
public ObjRef (MarshalByRefObject o, Type requestedType);
[System.Security.SecurityCritical]
public ObjRef (MarshalByRefObject o, Type requestedType);
new System.Runtime.Remoting.ObjRef : MarshalByRefObject * Type -> System.Runtime.Remoting.ObjRef
[<System.Security.SecurityCritical>]
new System.Runtime.Remoting.ObjRef : MarshalByRefObject * Type -> System.Runtime.Remoting.ObjRef
Public Sub New (o As MarshalByRefObject, requestedType As Type)

Parameters

o
MarshalByRefObject

The object that the new ObjRef instance will reference.

requestedType
Type

The Type of the object that the new ObjRef instance will reference.

Attributes
SecurityCriticalAttribute

Examples

// a custom ObjRef class that outputs its status
[System::Security::Permissions::SecurityPermissionAttribute(
   System::Security::Permissions::SecurityAction::Demand,
   Flags=System::Security::Permissions::SecurityPermissionFlag::SerializationFormatter)]
[System::Security::Permissions::SecurityPermissionAttribute
(System::Security::Permissions::SecurityAction::Demand, 
Flags=System::Security::Permissions::SecurityPermissionFlag::Infrastructure)]	
[System::Security::Permissions::SecurityPermissionAttribute
(System::Security::Permissions::SecurityAction::InheritanceDemand, 
Flags=System::Security::Permissions::SecurityPermissionFlag::Infrastructure)]

public ref class MyObjRef: public ObjRef
{
private:

   // only instantiate via marshaling or deserialization
   MyObjRef(){}

public:
   MyObjRef( MarshalByRefObject^ o, Type^ t )
      : ObjRef( o, t )
   {
      Console::WriteLine( "Created MyObjRef." );
      ORDump();
   }

   MyObjRef( SerializationInfo^ i, StreamingContext c )
      : ObjRef( i, c )
   {
      Console::WriteLine( "Deserialized MyObjRef." );
   }

   virtual void GetObjectData( SerializationInfo^ s, StreamingContext c ) override
   {
      
      // After calling the base method, change the type from ObjRef to MyObjRef
      ObjRef::GetObjectData( s, c );
      s->SetType( GetType() );
      Console::WriteLine( "Serialized MyObjRef." );
   }
   
   virtual Object^ GetRealObject( StreamingContext context ) override
   {
      if ( IsFromThisAppDomain() || IsFromThisProcess() )
      {
         Console::WriteLine( "Returning actual Object* referenced by MyObjRef." );
         return ObjRef::GetRealObject( context );
      }
      else
      {
         Console::WriteLine( "Returning proxy to remote Object*." );
         return RemotingServices::Unmarshal( this );
      }
   }

   void ORDump()
   {
      Console::WriteLine( " --- Reporting MyObjRef Info --- " );
      Console::WriteLine( "Reference to {0}.", TypeInfo->TypeName );
      Console::WriteLine( "URI is {0}.", URI );
      Console::WriteLine( "\nWriting EnvoyInfo: " );
      if ( EnvoyInfo != nullptr )
      {
         IMessageSink^ EISinks = EnvoyInfo->EnvoySinks;
         while ( EISinks != nullptr )
         {
            Console::WriteLine( "\tSink: {0}", EISinks );
            EISinks = EISinks->NextSink;
         }
      }
      else
            Console::WriteLine( "\t {no sinks}" );

      Console::WriteLine( "\nWriting ChannelInfo: " );
      for ( int i = 0; i < ChannelInfo->ChannelData->Length; i++ )
         Console::WriteLine( "\tChannel: {0}", ChannelInfo->ChannelData[ i ] );
      Console::WriteLine( " ----------------------------- " );
   }
};

// a class that uses MyObjRef
public ref class LocalObject: public MarshalByRefObject
{
public:

   // overriding CreateObjRef will allow us to return a custom ObjRef
   [System::Security::Permissions::SecurityPermissionAttribute
   (System::Security::Permissions::SecurityAction::LinkDemand,
   Flags=System::Security::Permissions::SecurityPermissionFlag::Infrastructure)]
   virtual ObjRef^ CreateObjRef( Type^ t ) override
   {
      return gcnew MyObjRef( this,t );
   }
};

// a custom ObjRef class that outputs its status
public class MyObjRef : ObjRef {

   // only instantiate via marshaling or deserialization
   private MyObjRef() { }

   public MyObjRef(MarshalByRefObject o, Type t) : base(o, t) {
      Console.WriteLine("Created MyObjRef.");
      ORDump();
   }

   public MyObjRef(SerializationInfo i, StreamingContext c) : base(i, c) {
      Console.WriteLine("Deserialized MyObjRef.");
   }

   public override void GetObjectData(SerializationInfo s, StreamingContext c) {
      // After calling the base method, change the type from ObjRef to MyObjRef
      base.GetObjectData(s, c);
      s.SetType(GetType());
      Console.WriteLine("Serialized MyObjRef.");
   }

   public override Object GetRealObject(StreamingContext context) {

      if ( IsFromThisAppDomain() || IsFromThisProcess() )  {
         Console.WriteLine("Returning actual object referenced by MyObjRef.");
         return base.GetRealObject(context);
      }
      else {
         Console.WriteLine("Returning proxy to remote object.");
         return RemotingServices.Unmarshal(this);
      }
   }

   public void ORDump() {

      Console.WriteLine(" --- Reporting MyObjRef Info --- ");
      Console.WriteLine("Reference to {0}.", TypeInfo.TypeName);
      Console.WriteLine("URI is {0}.", URI);

      Console.WriteLine("\nWriting EnvoyInfo: ");

      if ( EnvoyInfo != null) {

         IMessageSink EISinks = EnvoyInfo.EnvoySinks;

         while (EISinks != null) {
            Console.WriteLine("\tSink: " + EISinks.ToString());
            EISinks = EISinks.NextSink;
         }
      }
      else
        {
            Console.WriteLine("\t {no sinks}");
        }

        Console.WriteLine("\nWriting ChannelInfo: ");
      for (int i = 0; i < ChannelInfo.ChannelData.Length; i++)
         Console.WriteLine ("\tChannel: {0}", ChannelInfo.ChannelData[i]);

      Console.WriteLine(" ----------------------------- ");
   }
}

// a class that uses MyObjRef
public class LocalObject : MarshalByRefObject  {

   // overriding CreateObjRef will allow us to return a custom ObjRef
   public override ObjRef CreateObjRef(Type t) {

      return new MyObjRef(this, t);
   }
}

Applies to

ObjRef(SerializationInfo, StreamingContext)

Initializes a new instance of the ObjRef class from serialized data.

protected:
 ObjRef(System::Runtime::Serialization::SerializationInfo ^ info, System::Runtime::Serialization::StreamingContext context);
protected ObjRef (System.Runtime.Serialization.SerializationInfo info, System.Runtime.Serialization.StreamingContext context);
[System.Security.SecurityCritical]
protected ObjRef (System.Runtime.Serialization.SerializationInfo info, System.Runtime.Serialization.StreamingContext context);
new System.Runtime.Remoting.ObjRef : System.Runtime.Serialization.SerializationInfo * System.Runtime.Serialization.StreamingContext -> System.Runtime.Remoting.ObjRef
[<System.Security.SecurityCritical>]
new System.Runtime.Remoting.ObjRef : System.Runtime.Serialization.SerializationInfo * System.Runtime.Serialization.StreamingContext -> System.Runtime.Remoting.ObjRef
Protected Sub New (info As SerializationInfo, context As StreamingContext)

Parameters

info
SerializationInfo

The object that holds the serialized object data.

context
StreamingContext

The contextual information about the source or destination of the exception.

Attributes
SecurityCriticalAttribute

Examples

// a custom ObjRef class that outputs its status
[System::Security::Permissions::SecurityPermissionAttribute(
   System::Security::Permissions::SecurityAction::Demand,
   Flags=System::Security::Permissions::SecurityPermissionFlag::SerializationFormatter)]
[System::Security::Permissions::SecurityPermissionAttribute
(System::Security::Permissions::SecurityAction::Demand, 
Flags=System::Security::Permissions::SecurityPermissionFlag::Infrastructure)]	
[System::Security::Permissions::SecurityPermissionAttribute
(System::Security::Permissions::SecurityAction::InheritanceDemand, 
Flags=System::Security::Permissions::SecurityPermissionFlag::Infrastructure)]

public ref class MyObjRef: public ObjRef
{
private:

   // only instantiate via marshaling or deserialization
   MyObjRef(){}

public:
   MyObjRef( MarshalByRefObject^ o, Type^ t )
      : ObjRef( o, t )
   {
      Console::WriteLine( "Created MyObjRef." );
      ORDump();
   }

   MyObjRef( SerializationInfo^ i, StreamingContext c )
      : ObjRef( i, c )
   {
      Console::WriteLine( "Deserialized MyObjRef." );
   }

   virtual void GetObjectData( SerializationInfo^ s, StreamingContext c ) override
   {
      
      // After calling the base method, change the type from ObjRef to MyObjRef
      ObjRef::GetObjectData( s, c );
      s->SetType( GetType() );
      Console::WriteLine( "Serialized MyObjRef." );
   }
   
   virtual Object^ GetRealObject( StreamingContext context ) override
   {
      if ( IsFromThisAppDomain() || IsFromThisProcess() )
      {
         Console::WriteLine( "Returning actual Object* referenced by MyObjRef." );
         return ObjRef::GetRealObject( context );
      }
      else
      {
         Console::WriteLine( "Returning proxy to remote Object*." );
         return RemotingServices::Unmarshal( this );
      }
   }

   void ORDump()
   {
      Console::WriteLine( " --- Reporting MyObjRef Info --- " );
      Console::WriteLine( "Reference to {0}.", TypeInfo->TypeName );
      Console::WriteLine( "URI is {0}.", URI );
      Console::WriteLine( "\nWriting EnvoyInfo: " );
      if ( EnvoyInfo != nullptr )
      {
         IMessageSink^ EISinks = EnvoyInfo->EnvoySinks;
         while ( EISinks != nullptr )
         {
            Console::WriteLine( "\tSink: {0}", EISinks );
            EISinks = EISinks->NextSink;
         }
      }
      else
            Console::WriteLine( "\t {no sinks}" );

      Console::WriteLine( "\nWriting ChannelInfo: " );
      for ( int i = 0; i < ChannelInfo->ChannelData->Length; i++ )
         Console::WriteLine( "\tChannel: {0}", ChannelInfo->ChannelData[ i ] );
      Console::WriteLine( " ----------------------------- " );
   }
};

// a class that uses MyObjRef
public ref class LocalObject: public MarshalByRefObject
{
public:

   // overriding CreateObjRef will allow us to return a custom ObjRef
   [System::Security::Permissions::SecurityPermissionAttribute
   (System::Security::Permissions::SecurityAction::LinkDemand,
   Flags=System::Security::Permissions::SecurityPermissionFlag::Infrastructure)]
   virtual ObjRef^ CreateObjRef( Type^ t ) override
   {
      return gcnew MyObjRef( this,t );
   }
};

// a custom ObjRef class that outputs its status
public class MyObjRef : ObjRef {

   // only instantiate via marshaling or deserialization
   private MyObjRef() { }

   public MyObjRef(MarshalByRefObject o, Type t) : base(o, t) {
      Console.WriteLine("Created MyObjRef.");
      ORDump();
   }

   public MyObjRef(SerializationInfo i, StreamingContext c) : base(i, c) {
      Console.WriteLine("Deserialized MyObjRef.");
   }

   public override void GetObjectData(SerializationInfo s, StreamingContext c) {
      // After calling the base method, change the type from ObjRef to MyObjRef
      base.GetObjectData(s, c);
      s.SetType(GetType());
      Console.WriteLine("Serialized MyObjRef.");
   }

   public override Object GetRealObject(StreamingContext context) {

      if ( IsFromThisAppDomain() || IsFromThisProcess() )  {
         Console.WriteLine("Returning actual object referenced by MyObjRef.");
         return base.GetRealObject(context);
      }
      else {
         Console.WriteLine("Returning proxy to remote object.");
         return RemotingServices.Unmarshal(this);
      }
   }

   public void ORDump() {

      Console.WriteLine(" --- Reporting MyObjRef Info --- ");
      Console.WriteLine("Reference to {0}.", TypeInfo.TypeName);
      Console.WriteLine("URI is {0}.", URI);

      Console.WriteLine("\nWriting EnvoyInfo: ");

      if ( EnvoyInfo != null) {

         IMessageSink EISinks = EnvoyInfo.EnvoySinks;

         while (EISinks != null) {
            Console.WriteLine("\tSink: " + EISinks.ToString());
            EISinks = EISinks.NextSink;
         }
      }
      else
        {
            Console.WriteLine("\t {no sinks}");
        }

        Console.WriteLine("\nWriting ChannelInfo: ");
      for (int i = 0; i < ChannelInfo.ChannelData.Length; i++)
         Console.WriteLine ("\tChannel: {0}", ChannelInfo.ChannelData[i]);

      Console.WriteLine(" ----------------------------- ");
   }
}

// a class that uses MyObjRef
public class LocalObject : MarshalByRefObject  {

   // overriding CreateObjRef will allow us to return a custom ObjRef
   public override ObjRef CreateObjRef(Type t) {

      return new MyObjRef(this, t);
   }
}

Remarks

This constructor is called during deserialization to reconstitute the exception object transmitted over a stream. For more information, see ISerializable.

Applies to