ObjRef.GetRealObject メソッドとは何？わかりやすく解説 Weblio辞書

.NET Framework クラスライブラリリファレンス

索引トップ用語の索引ランキング

ObjRef.GetRealObject メソッド

ObjRef が記述するリモートオブジェクトへの参照を返します。

名前空間: System.Runtime.Remoting
アセンブリ: mscorlib (mscorlib.dll 内)
構文

Visual Basic (宣言)

Public Overridable Function
 GetRealObject ( _
    context As StreamingContext _
) As Object

Visual Basic (使用法)

Dim instance As ObjRef
Dim context As StreamingContext
Dim returnValue As Object

returnValue = instance.GetRealObject(context)

public virtual Object GetRealObject (
    StreamingContext context
)

C++

public:
virtual Object^ GetRealObject (
    StreamingContext context
)

public Object GetRealObject (
    StreamingContext context
)

JScript

public function GetRealObject (
    context : StreamingContext
) : Object

パラメータ

context: 現在のオブジェクトが存在しているコンテキスト。

戻り値
ObjRef が記述するリモートオブジェクトへの参照。

例外

例外の種類	条件
SecurityException	直前の呼び出し元に、シリアル化フォーマッタへのアクセス許可がありません。

解説

現在のメソッドは、逆シリアル化のフィックスアップの段階中に呼び出されます。

使用例

// a custom ObjRef class that outputs its status
[PermissionSet(SecurityAction.Demand, Name="FullTrust")]
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
[PermissionSet(SecurityAction.Demand, Name="FullTrust")]
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);
   }
}

C++

// 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 );
   }
};