AsyncResult AsyncResult AsyncResult AsyncResult Class

Definition

Kapselt die Ergebnisse eines asynchronen Vorgangs für einen Delegaten.Encapsulates the results of an asynchronous operation on a delegate.

public ref class AsyncResult : IAsyncResult, System::Runtime::Remoting::Messaging::IMessageSink
[System.Runtime.InteropServices.ComVisible(true)]
public class AsyncResult : IAsyncResult, System.Runtime.Remoting.Messaging.IMessageSink
type AsyncResult = class
    interface IAsyncResult
    interface IMessageSink
Public Class AsyncResult
Implements IAsyncResult, IMessageSink
Vererbung
AsyncResultAsyncResultAsyncResultAsyncResult
Attribute
Implementiert

Beispiele

Im folgenden Beispiel wird veranschaulicht, wie die AsyncWaitHandle die abzurufende Eigenschaft eine WaitHandle, und Warten eines asynchronen Aufrufs für einen Delegaten auf.The following example demonstrates how to use the AsyncWaitHandle property to get a WaitHandle, and how to wait for an asynchronous call on a delegate. Das WaitHandle wird bei Beendigung des asynchronen Aufrufs signalisiert, und durch Aufrufen der WaitOne -Methode kann darauf gewartet werden.The WaitHandle is signaled when the asynchronous call completes, and you can wait for it by calling the WaitOne method.

Das Beispiel besteht aus zwei Klassen, die Klasse, die die Methode enthält, die asynchron aufgerufen wird, und die Klasse enthält die Main -Methode, die den Aufruf ausführt.The example consists of two classes, the class that contains the method which is called asynchronously, and the class that contains the Main method that makes the call.

Weitere Informationen und Beispiele von asynchronen Aufrufen von Methoden mit Delegaten finden Sie unter Calling Synchronous Methods Asynchronously.For more information and more examples of calling methods asynchronously by using delegates, see Calling Synchronous Methods Asynchronously.

using namespace System;
using namespace System::Threading;
using namespace System::Runtime::InteropServices; 

namespace Examples {
namespace AdvancedProgramming {
namespace AsynchronousOperations
{
    public ref class AsyncDemo 
    {
    public:
        // The method to be executed asynchronously.
        String^ TestMethod(int callDuration, [OutAttribute] int% threadId) 
        {
            Console::WriteLine("Test method begins.");
            Thread::Sleep(callDuration);
            threadId = Thread::CurrentThread->ManagedThreadId;
            return String::Format("My call time was {0}.", callDuration);
        }
    };

    // The delegate must have the same signature as the method
    // it will call asynchronously.
    public delegate String^ AsyncMethodCaller(int callDuration, [OutAttribute] int% threadId);
}}}
using System;
using System.Threading; 

namespace Examples.AdvancedProgramming.AsynchronousOperations
{
    public class AsyncDemo 
    {
        // The method to be executed asynchronously.
        public string TestMethod(int callDuration, out int threadId) 
        {
            Console.WriteLine("Test method begins.");
            Thread.Sleep(callDuration);
            threadId = Thread.CurrentThread.ManagedThreadId;
            return String.Format("My call time was {0}.", callDuration.ToString());
        }
    }
    // The delegate must have the same signature as the method
    // it will call asynchronously.
    public delegate string AsyncMethodCaller(int callDuration, out int threadId);
}
Imports System
Imports System.Threading
Imports System.Runtime.InteropServices 

Namespace Examples.AdvancedProgramming.AsynchronousOperations
    Public Class AsyncDemo 
        ' The method to be executed asynchronously.
        Public Function TestMethod(ByVal callDuration As Integer, _
                <Out> ByRef threadId As Integer) As String
            Console.WriteLine("Test method begins.")
            Thread.Sleep(callDuration)
            threadId = Thread.CurrentThread.ManagedThreadId()
            return String.Format("My call time was {0}.", callDuration.ToString())
        End Function
    End Class

    ' The delegate must have the same signature as the method
    ' it will call asynchronously.
    Public Delegate Function AsyncMethodCaller(ByVal callDuration As Integer, _
        <Out> ByRef threadId As Integer) As String
End Namespace
#using <TestMethod.dll>

using namespace System;
using namespace System::Threading;
using namespace Examples::AdvancedProgramming::AsynchronousOperations;

void main() 
{
    // The asynchronous method puts the thread id here.
    int threadId;

    // Create an instance of the test class.
    AsyncDemo^ ad = gcnew AsyncDemo();

    // Create the delegate.
    AsyncMethodCaller^ caller = gcnew AsyncMethodCaller(ad, &AsyncDemo::TestMethod);
       
    // Initiate the asychronous call.
    IAsyncResult^ result = caller->BeginInvoke(3000, 
        threadId, nullptr, nullptr);

    Thread::Sleep(0);
    Console::WriteLine("Main thread {0} does some work.",
        Thread::CurrentThread->ManagedThreadId);

    // Wait for the WaitHandle to become signaled.
    result->AsyncWaitHandle->WaitOne();

    // Perform additional processing here.
    // Call EndInvoke to retrieve the results.
    String^ returnValue = caller->EndInvoke(threadId, result);

    // Close the wait handle.
    result->AsyncWaitHandle->Close();

    Console::WriteLine("The call executed on thread {0}, with return value \"{1}\".",
        threadId, returnValue);
}

/* This example produces output similar to the following:

Main thread 1 does some work.
Test method begins.
The call executed on thread 3, with return value "My call time was 3000.".
 */
using System;
using System.Threading;

namespace Examples.AdvancedProgramming.AsynchronousOperations
{
    public class AsyncMain 
    {
        static void Main() 
        {
            // The asynchronous method puts the thread id here.
            int threadId;

            // Create an instance of the test class.
            AsyncDemo ad = new AsyncDemo();

            // Create the delegate.
            AsyncMethodCaller caller = new AsyncMethodCaller(ad.TestMethod);
       
            // Initiate the asychronous call.
            IAsyncResult result = caller.BeginInvoke(3000, 
                out threadId, null, null);

            Thread.Sleep(0);
            Console.WriteLine("Main thread {0} does some work.",
                Thread.CurrentThread.ManagedThreadId);

            // Wait for the WaitHandle to become signaled.
            result.AsyncWaitHandle.WaitOne();

            // Perform additional processing here.
            // Call EndInvoke to retrieve the results.
            string returnValue = caller.EndInvoke(out threadId, result);

            // Close the wait handle.
            result.AsyncWaitHandle.Close();

            Console.WriteLine("The call executed on thread {0}, with return value \"{1}\".",
                threadId, returnValue);
        }
    }
}

/* This example produces output similar to the following:

Main thread 1 does some work.
Test method begins.
The call executed on thread 3, with return value "My call time was 3000.".
 */
Imports System
Imports System.Threading
Imports System.Runtime.InteropServices 

Namespace Examples.AdvancedProgramming.AsynchronousOperations

    Public Class AsyncMain 
        Shared Sub Main() 
            ' The asynchronous method puts the thread id here.
            Dim threadId As Integer

            ' Create an instance of the test class.
            Dim ad As New AsyncDemo()

            ' Create the delegate.
            Dim caller As New AsyncMethodCaller(AddressOf ad.TestMethod)
       
            ' Initiate the asynchronous call.
            Dim result As IAsyncResult = caller.BeginInvoke(3000, _
                threadId, Nothing, Nothing)

            Thread.Sleep(0)
            Console.WriteLine("Main thread {0} does some work.", _
                Thread.CurrentThread.ManagedThreadId)
            ' Perform additional processing here and then
            ' wait for the WaitHandle to be signaled.
            result.AsyncWaitHandle.WaitOne()

            ' Call EndInvoke to retrieve the results.
            Dim returnValue As String = caller.EndInvoke(threadId, result)

            ' Close the wait handle.
            result.AsyncWaitHandle.Close()

            Console.WriteLine("The call executed on thread {0}, with return value ""{1}"".", _
                threadId, returnValue)
        End Sub
    End Class
End Namespace

'This example produces output similar to the following:
'
'Main thread 1 does some work.
'Test method begins.
'The call executed on thread 3, with return value "My call time was 3000.".

Hinweise

Die AsyncResult Klasse zusammen mit asynchronen Methodenaufrufen Verwenden von Delegaten verwendet wird.The AsyncResult class is used in conjunction with asynchronous method calls made using delegates. Die IAsyncResult zurückgegeben, aus des Delegaten die BeginInvoke Methode umgewandelt werden kann, um eine AsyncResult.The IAsyncResult returned from the delegate's BeginInvoke method can be cast to an AsyncResult. Die AsyncResult hat die AsyncDelegate Eigenschaft, die der Delegat enthält Objekt, auf dem der asynchrone Aufruf ausgelöst wurde.The AsyncResult has the AsyncDelegate property that holds the delegate object on which the asynchronous call was invoked.

Weitere Informationen zu BeginInvoke und asynchrone Aufrufe, die mithilfe von Delegaten finden Sie unter asynchrone Programmierung mithilfe von Delegaten.For more information about BeginInvoke and asynchronous calls using delegates, see Asynchronous Programming Using Delegates.

Eigenschaften

AsyncDelegate AsyncDelegate AsyncDelegate AsyncDelegate

Ruft das Delegatobjekt ab, für das der asynchrone Aufruf ausgelöst wurde.Gets the delegate object on which the asynchronous call was invoked.

AsyncState AsyncState AsyncState AsyncState

Ruft das Objekt ab, das als letzter Parameter eines BeginInvoke-Methodenaufrufs angegeben ist.Gets the object provided as the last parameter of a BeginInvoke method call.

AsyncWaitHandle AsyncWaitHandle AsyncWaitHandle AsyncWaitHandle

Ruft ein WaitHandle ab, das Win32-Synchronisierungshandles kapselt und die Implementierung verschiedener Synchronisierungsschemas ermöglicht.Gets a WaitHandle that encapsulates Win32 synchronization handles, and allows the implementation of various synchronization schemes.

CompletedSynchronously CompletedSynchronously CompletedSynchronously CompletedSynchronously

Ruft einen Wert ab, der angibt, ob der BeginInvoke-Aufruf synchron abgeschlossen wurde.Gets a value indicating whether the BeginInvoke call completed synchronously.

EndInvokeCalled EndInvokeCalled EndInvokeCalled EndInvokeCalled

Ruft einen Wert ab, der angibt, ob EndInvoke für das aktuelle AsyncResult aufgerufen wurde, oder legt diesen fest.Gets or sets a value indicating whether EndInvoke has been called on the current AsyncResult.

IsCompleted IsCompleted IsCompleted IsCompleted

Ruft einen Wert ab, der angibt, ob der Server den Aufruf abgeschlossen hat.Gets a value indicating whether the server has completed the call.

NextSink NextSink NextSink NextSink

Ruft die nächste Meldungssenke in der Senkenkette ab.Gets the next message sink in the sink chain.

Methoden

AsyncProcessMessage(IMessage, IMessageSink) AsyncProcessMessage(IMessage, IMessageSink) AsyncProcessMessage(IMessage, IMessageSink) AsyncProcessMessage(IMessage, IMessageSink)

Implementiert die IMessageSink-Schnittstelle.Implements the IMessageSink interface.

Equals(Object) Equals(Object) Equals(Object) Equals(Object)

Bestimmt, ob das angegebene Objekt mit dem aktuellen Objekt identisch ist.Determines whether the specified object is equal to the current object.

(Inherited from Object)
GetHashCode() GetHashCode() GetHashCode() GetHashCode()

Fungiert als Standardhashfunktion.Serves as the default hash function.

(Inherited from Object)
GetReplyMessage() GetReplyMessage() GetReplyMessage() GetReplyMessage()

Ruft die Antwortmeldung für den asynchronen Aufruf ab.Gets the response message for the asynchronous call.

GetType() GetType() GetType() GetType()

Ruft den Type der aktuellen Instanz ab.Gets the Type of the current instance.

(Inherited from Object)
MemberwiseClone() MemberwiseClone() MemberwiseClone() MemberwiseClone()

Erstellt eine flache Kopie des aktuellen Object.Creates a shallow copy of the current Object.

(Inherited from Object)
SetMessageCtrl(IMessageCtrl) SetMessageCtrl(IMessageCtrl) SetMessageCtrl(IMessageCtrl) SetMessageCtrl(IMessageCtrl)

Legt ein IMessageCtrl für den aktuellen Remotemethodenaufruf fest, das das Steuern asynchroner Meldungen nach der Meldungsverteilung ermöglicht.Sets an IMessageCtrl for the current remote method call, which provides a way to control asynchronous messages after they have been dispatched.

SyncProcessMessage(IMessage) SyncProcessMessage(IMessage) SyncProcessMessage(IMessage) SyncProcessMessage(IMessage)

Verarbeitet eine von einem Methodenaufruf für ein Remoteobjekt zurückgegebene Antwortmeldung synchron.Synchronously processes a response message returned by a method call on a remote object.

ToString() ToString() ToString() ToString()

Gibt eine Zeichenfolge zurück, die das aktuelle Objekt darstellt.Returns a string that represents the current object.

(Inherited from Object)

Gilt für:

Siehe auch