AsyncResult クラス

.NET Framework クラス ライブラリ リファレンス

AsyncResult クラス

非同期デリゲートでの非同期操作の結果をカプセル化します。

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

Visual Basic (宣言)

<ComVisibleAttribute(True)> _
Public Class AsyncResult
    Implements IAsyncResult, IMessageSink

Visual Basic (使用法)

Dim instance As AsyncResult

C#

[ComVisibleAttribute(true)] 
public class AsyncResult : IAsyncResult, IMessageSink

C++

[ComVisibleAttribute(true)] 
public ref class AsyncResult : IAsyncResult,
 IMessageSink

J#

/** @attribute ComVisibleAttribute(true) */ 
public class AsyncResult implements IAsyncResult,
 IMessageSink

JScript

ComVisibleAttribute(true) 
public class AsyncResult implements IAsyncResult,
 IMessageSink

解説

AsyncResult クラスは、非同期デリゲートと組み合わせて使用します。デリゲートの BeginInvoke メソッドから返された IAsyncResult を AsyncResult にキャストできます。AsyncResult には、非同期の呼び出しが行われたデリゲート オブジェクトを保持する AsyncDelegate プロパティがあります。

BeginInvoke と非同期デリゲートの詳細については、「デリゲートを使用した非同期プログラミング」を参照してください。

使用例

非同期デリゲートでの非同期操作の結果を取得するために、AsyncResult クラスを使用する方法を次のコード例に示します。

Visual Basic

Imports System
Imports System.Threading
Imports System.Runtime.Remoting
Imports System.Runtime.Remoting.Contexts
Imports System.Runtime.Remoting.Messaging


' Context-bound type with the Synchronization context attribute.
<Synchronization()> Public Class SampleSyncronized
   Inherits ContextBoundObject
   
   ' A method that does some work, and returns the square of the given
 number.
   Public Function Square(i As
 Integer) As Integer
      
      Console.Write("The hash of the thread executing ")
      Console.WriteLine("SampleSyncronized.Square is: {0}",
 Thread.CurrentThread.GetHashCode())
      Return i * i
   End Function 'Square

End Class 'SampleSyncronized

' The async delegate used to call a method with this signature asynchronously.
Delegate Function SampSyncSqrDelegate(i As
 Integer) As Integer


Public Class AsyncResultSample
   
   ' Asynchronous Callback method.
   Public Shared Sub MyCallback(ar
 As IAsyncResult)
      ' Obtains the last parameter of the delegate call.
      Dim value As Integer
 = Convert.ToInt32(ar.AsyncState)
      
      ' Obtains return value from the delegate call using EndInvoke.
      Dim aResult As AsyncResult = CType(ar,
 AsyncResult)
      Dim temp As SampSyncSqrDelegate = CType(aResult.AsyncDelegate,
 SampSyncSqrDelegate)
      Dim result As Integer
 = temp.EndInvoke(ar)
      
      Console.Write("Simple.SomeMethod (AsyncCallback): Result
 of ")
      Console.WriteLine("{0} in SampleSynchronized.Square is {1}
 ", value, result)
   End Sub 'MyCallback  

   Public Shared Sub Main()
      
      Dim result As Integer
      Dim param As Integer
      
      ' Creates an instance of a context-bound type SampleSynchronized.
      Dim sampSyncObj As New
 SampleSyncronized()
      
      ' Checks whether the object is a proxy, since it is context-bound.
      If RemotingServices.IsTransparentProxy(sampSyncObj) Then
         Console.WriteLine("sampSyncObj is a proxy.")
      Else
         Console.WriteLine("sampSyncObj is NOT a proxy.")
      End If 

      param = 10
      
      Console.WriteLine("")
      Console.WriteLine("Making a synchronous call on the context-bound
 object:")
      
      result = sampSyncObj.Square(param)
      Console.Write("The result of calling sampSyncObj.Square
 with ")
      Console.WriteLine("{0} is {1}.", param, result)
      Console.WriteLine("")     

      Dim sampleDelegate As New
 SampSyncSqrDelegate(AddressOf sampSyncObj.Square)
      param = 8
      
      Console.WriteLine("Making a single asynchronous call on
 the context-bound object:")
      
      Dim ar1 As IAsyncResult = sampleDelegate.BeginInvoke(param,
 New AsyncCallback(AddressOf AsyncResultSample.MyCallback),
 param)
      
      Console.WriteLine("Waiting for the asynchronous call to
 complete...")
      Dim wh As WaitHandle = ar1.AsyncWaitHandle
      wh.WaitOne()
      
      Console.WriteLine("")
      Console.WriteLine("Waiting for the AsyncCallback to complete...")
      Thread.Sleep(1000)
   End Sub 'Main 
End Class 'AsyncResultSample 

C#

using System;
using System.Threading;
using System.Runtime.Remoting;
using System.Runtime.Remoting.Contexts;
using System.Runtime.Remoting.Messaging;

// Context-bound type with the Synchronization context attribute.
[Synchronization()]
public class SampleSyncronized : ContextBoundObject
 {

    // A method that does some work, and returns the square of the given
 number.
    public int Square(int
 i)  {

        Console.Write("The hash of the thread executing ");
        Console.WriteLine("SampleSyncronized.Square is: {0}", 
                             Thread.CurrentThread.GetHashCode());
        return i*i;
    }
}

// The async delegate used to call a method with this signature asynchronously.
public delegate int SampSyncSqrDelegate(int
 i);

public class AsyncResultSample {

    // Asynchronous Callback method.
    public static void MyCallback(IAsyncResult
 ar) {

        // Obtains the last parameter of the delegate call.
        int value = Convert.ToInt32(ar.AsyncState);

        // Obtains return value from the delegate call using EndInvoke.
        AsyncResult aResult = (AsyncResult)ar;
        SampSyncSqrDelegate temp = (SampSyncSqrDelegate)aResult.AsyncDelegate;
        int result = temp.EndInvoke(ar);

        Console.Write("Simple.SomeMethod (AsyncCallback): Result of ");
        Console.WriteLine("{0} in SampleSynchronized.Square
 is {1} ", value, result);
    }

    public static void Main()
 {

        int result;
        int param;

        // Creates an instance of a context-bound type SampleSynchronized.
        SampleSyncronized sampSyncObj = new SampleSyncronized();

        // Checks whether the object is a proxy, since it is context-bound.
        if (RemotingServices.IsTransparentProxy(sampSyncObj))
            Console.WriteLine("sampSyncObj is a proxy.");
        else
            Console.WriteLine("sampSyncObj is NOT a proxy.");

        param = 10;

        Console.WriteLine("");
        Console.WriteLine("Making a synchronous call on the context-bound object:");

        result = sampSyncObj.Square(param);
        Console.Write("The result of calling sampSyncObj.Square with ");
        Console.WriteLine("{0} is {1}.", param, result);
        Console.WriteLine("");

        SampSyncSqrDelegate sampleDelegate = new SampSyncSqrDelegate(sampSyncObj.Square);
        param = 8;

        Console.WriteLine("Making a single asynchronous call on the context-bound
 object:");

        IAsyncResult ar1 = sampleDelegate.BeginInvoke( param, 
                              new AsyncCallback(AsyncResultSample.MyCallback),
 
                              param);

        Console.WriteLine("Waiting for the asynchronous call
 to complete...");
        WaitHandle wh = ar1.AsyncWaitHandle;
        wh.WaitOne();

        Console.WriteLine("");
        Console.WriteLine("Waiting for the AsyncCallback
 to complete...");
        Thread.Sleep(1000);
    }
}

C++

using namespace System;
using namespace System::Threading;
using namespace System::Runtime::Remoting;
using namespace System::Runtime::Remoting::Contexts;
using namespace System::Runtime::Remoting::Messaging;

// Context-bound type with the Synchronization context attribute.

[Synchronization]
public ref class SampleSyncronized: public
 ContextBoundObject
{
public:

   // A method that does some work, and returns the square of the given
 number.
   int Square( int i )
   {
      Console::Write( "The hash of the thread executing " );
      Console::WriteLine( "SampleSyncronized::Square is: {0}", Thread::CurrentThread->GetHashCode()
 );
      return i * i;
   }

};

// The async delegate used to call a method with this signature asynchronously.
int i );
public ref class AsyncResultSample
{
public:

   // Asynchronous Callback method.
   static void MyCallback( IAsyncResult^ ar
 )
   {
      
      // Obtains the last parameter of the delegate call.
      int value = Convert::ToInt32( ar->AsyncState );
      
      // Obtains return value from the delegate call using EndInvoke.
      AsyncResult^ aResult = dynamic_cast<AsyncResult^>(ar);
      SampSyncSqrDelegate^ temp = static_cast<SampSyncSqrDelegate^>(aResult->AsyncDelegate);
      int result = temp->EndInvoke( ar );
      Console::Write( "Simple::SomeMethod (AsyncCallback): Result of "
 );
      Console::WriteLine( " {0} in SampleSynchronized::Square
 is {1} ", value, result );
   }

};

int main()
{
   int result;
   int param;
   
   // Creates an instance of a context-bound type SampleSynchronized.
   SampleSyncronized^ sampSyncObj = gcnew SampleSyncronized;
   
   // Checks whether the Object* is a proxy, since it is context-bound.
   if ( RemotingServices::IsTransparentProxy( sampSyncObj ) )
      Console::WriteLine( "sampSyncObj is a proxy." );
   else
      Console::WriteLine( "sampSyncObj is NOT a proxy." );

   
   param = 10;
   Console::WriteLine( "" );
   Console::WriteLine( "Making a synchronous call on the context-bound Object*:"
 );
   result = sampSyncObj->Square( param );
   Console::Write( "The result of calling sampSyncObj.Square with " );
   Console::WriteLine( " {0} is {1}.", param, result );
   Console::WriteLine( "" );
   
   SampSyncSqrDelegate^ sampleDelegate = gcnew SampSyncSqrDelegate( sampSyncObj,
 &SampleSyncronized::Square );
   param = 8;
   Console::WriteLine( "Making a single asynchronous call on the context-bound
 Object*:" );
   IAsyncResult^ ar1 = sampleDelegate->BeginInvoke( param, gcnew AsyncCallback(
 AsyncResultSample::MyCallback ), param );
   Console::WriteLine( "Waiting for the asynchronous call
 to complete..." );
   WaitHandle^ wh = ar1->AsyncWaitHandle;
   wh->WaitOne();
   Console::WriteLine( "" );
   Console::WriteLine( "Waiting for the AsyncCallback to
 complete..." );
   Thread::Sleep( 1000 );
   return 0;
   
}

J#

import System.*;
import System.Threading.*;
import System.Runtime.Remoting.*;
import System.Runtime.Remoting.Contexts.*;
import System.Runtime.Remoting.Messaging.*;

// Context-bound type with the Synchronization context attribute.
/** @attribute Synchronization()
 */
public class SampleSyncronized extends ContextBoundObject
{
    // A method that does some work, and returns the square of the given
 number.
    public int Square(int
 i)
    {
        Console.Write("The hash of the thread executing ");
        Console.WriteLine("SampleSyncronized.Square is: {0}",
            (Int32)System.Threading.Thread.get_CurrentThread().GetHashCode());
        return i * i;
    } //Square
} //SampleSyncronized

// The async delegate used to call a method with this signature asynchronously.
/** @delegate 
 */
public delegate int SampSyncSqrDelegate(int
 i);

public class AsyncResultSample
{
    static int value;
    // Asynchronous Callback method.
    public static void MyCallback(IAsyncResult
 ar)
    {
        // Obtains the last parameter of the delegate call.
        SampSyncSqrDelegate sampDelg = (SampSyncSqrDelegate)ar.get_AsyncState();
        
        // Obtains return value from the delegate call using EndInvoke.
        AsyncResult aResult = (AsyncResult)ar;
        SampSyncSqrDelegate temp =
            (SampSyncSqrDelegate)(aResult.get_AsyncDelegate());
        int threadId = AppDomain.GetCurrentThreadId();
        int result = temp.EndInvoke(ar);

        Console.Write("Simple.SomeMethod (AsyncCallback): Result of ");
        Console.WriteLine("{0} in SampleSynchronized.Square
 is {1} ",
            (Int32)value, (Int32)result);
    } //MyCallback

    public static void main(String[]
 args)
    {
        int result;
        int param;
        // Creates an instance of a context-bound type SampleSynchronized.
        SampleSyncronized sampSyncObj = new SampleSyncronized();
        // Checks whether the object is a proxy, since it is context-bound.
        if (RemotingServices.IsTransparentProxy(sampSyncObj))
 {
            Console.WriteLine("sampSyncObj is a proxy.");
        }
        else {
            Console.WriteLine("sampSyncObj is NOT a proxy.");
        }

        param = 10;
        Console.WriteLine("");
        Console.WriteLine("Making a synchronous call on the context-bound "
            + "object:");
        result = sampSyncObj.Square(param);
        Console.Write("The result of calling sampSyncObj.Square with ");
        Console.WriteLine("{0} is {1}.", (Int32)param, (Int32)result);
        Console.WriteLine("");

        SampSyncSqrDelegate sampleDelegate =
            new SampSyncSqrDelegate(sampSyncObj.Square);
        param = 8;
        value = param;
        Console.WriteLine("Making a single asynchronous call on the "
            + "context-bound object:");
        IAsyncResult ar1 = sampleDelegate.BeginInvoke(param,
            new AsyncCallback(AsyncResultSample.MyCallback), sampleDelegate);

        Console.WriteLine("Waiting for the asynchronous call
 to complete...");
        WaitHandle wh = ar1.get_AsyncWaitHandle();

        wh.WaitOne();
        Console.WriteLine("");
        Console.WriteLine("Waiting for the AsyncCallback
 to complete...");
        System.Threading.Thread.Sleep(1000);
    } //main 
} //AsyncResultSample

継承階層

System.Object
  System.Runtime.Remoting.Messaging.AsyncResult

スレッド セーフ

この型の public static (Visual Basic では Shared) メンバはすべて、スレッド セーフです。インスタンス メンバの場合は、スレッド セーフであるとは限りません。

プラットフォーム

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

開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。

バージョン情報

.NET Framework
サポート対象 : 2.0、1.1、1.0

参照

関連項目
AsyncResult メンバ
System.Runtime.Remoting.Messaging 名前空間
その他の技術情報
デリゲートを使用した非同期プログラミング