IAsyncResult Arabirim

Tanım

Zaman uyumsuz bir işlemin durumunu temsil eder.Represents the status of an asynchronous operation.

public interface class IAsyncResult
public interface IAsyncResult
[System.Runtime.InteropServices.ComVisible(true)]
public interface IAsyncResult
type IAsyncResult = interface
[<System.Runtime.InteropServices.ComVisible(true)>]
type IAsyncResult = interface
Public Interface IAsyncResult
Türetilmiş
Öznitelikler

Örnekler

Aşağıdaki örnek AsyncWaitHandle WaitHandle , bir temsilci üzerinde bir zaman uyumsuz çağrının nasıl bekleneceğini ve nasıl alınacağını gösterir.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. , WaitHandle Zaman uyumsuz çağrı tamamlandığında sinyal alırsınız ve yöntemini çağırarak bunu bekleyebilirsiniz WaitOne .The WaitHandle is signaled when the asynchronous call completes, and you can wait for it by calling the WaitOne method.

Örnek iki sınıftan oluşur: zaman uyumsuz olarak çağrılan yöntemi içeren sınıf ve Main çağrıyı yapan yöntemi içeren sınıf.The example consists of two classes: the class that contains the method that is called asynchronously, and the class that contains the Main method that makes the call.

Temsilciler kullanarak yöntemleri zaman uyumsuz olarak çağırma hakkında daha fazla bilgi ve örnek için bkz. zaman uyumsuz yöntemleri zaman uyumsuz olarak çağırma.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.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.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.".

Açıklamalar

IAsyncResultArabirim, zaman uyumsuz olarak çalışabilen Yöntemler içeren sınıflar tarafından uygulanır.The IAsyncResult interface is implemented by classes containing methods that can operate asynchronously. Bu, gibi zaman uyumsuz bir işlem Başlatan yöntemlerin dönüş türüdür FileStream.BeginRead ve gibi zaman uyumsuz bir işlemi sonuçlandırma yöntemlerine geçirilir FileStream.EndRead .It is the return type of methods that initiate an asynchronous operation, such as FileStream.BeginRead, and it is passed to methods that conclude an asynchronous operation, such as FileStream.EndRead. IAsyncResult nesneler, AsyncCallback zaman uyumsuz bir işlem tamamlandığında temsilciler tarafından çağrılan yöntemlere de geçirilir.IAsyncResult objects are also passed to methods invoked by AsyncCallback delegates when an asynchronous operation completes.

Arabirimi destekleyen bir nesne, IAsyncResult zaman uyumsuz bir işlem için durum bilgilerini depolar ve işlem tamamlandığında iş parçacıklarının sinyal verdiğine izin veren bir eşitleme nesnesi sağlar.An object that supports the IAsyncResult interface stores state information for an asynchronous operation and provides a synchronization object to allow threads to be signaled when the operation completes.

Not

AsyncResultSınıfı, IAsyncResult BeginInvoke bir yöntemi zaman uyumsuz olarak çağırmak için bir temsilci kullandığınızda yöntemi tarafından döndürülen uygulamasıdır.The AsyncResult class is the implementation of IAsyncResult that is returned by the BeginInvoke method when you use a delegate to call a method asynchronously.

Arabirimin nasıl kullanıldığına ilişkin ayrıntılı bir açıklama için IAsyncResult zaman uyumsuz yöntemleri zaman uyumsuz olarak çağırma konusuna bakın.For a detailed description of how the IAsyncResult interface is used, see the Calling Synchronous Methods Asynchronously topic.

Özellikler

AsyncState

Bir zaman uyumsuz işlemle ilgili bilgileri niteleyen veya içeren Kullanıcı tanımlı bir nesne alır.Gets a user-defined object that qualifies or contains information about an asynchronous operation.

AsyncWaitHandle

WaitHandleZaman uyumsuz bir işlemin tamamlanmasını beklemek için kullanılan bir alır.Gets a WaitHandle that is used to wait for an asynchronous operation to complete.

CompletedSynchronously

Zaman uyumsuz işlemin zaman uyumlu olarak tamamlanıp tamamlanmadığını gösteren bir değer alır.Gets a value that indicates whether the asynchronous operation completed synchronously.

IsCompleted

Zaman uyumsuz işlemin tamamlanıp tamamlanmadığını gösteren bir değer alır.Gets a value that indicates whether the asynchronous operation has completed.

Şunlara uygulanır