IAsyncResult.AsyncWaitHandle IAsyncResult.AsyncWaitHandle IAsyncResult.AsyncWaitHandle IAsyncResult.AsyncWaitHandle Property

정의

비동기 작업이 완료될 때까지 기다리는 데 사용하는 WaitHandle을 가져옵니다.Gets a WaitHandle that is used to wait for an asynchronous operation to complete.

public:
 property System::Threading::WaitHandle ^ AsyncWaitHandle { System::Threading::WaitHandle ^ get(); };
public System.Threading.WaitHandle AsyncWaitHandle { get; }
member this.AsyncWaitHandle : System.Threading.WaitHandle
Public ReadOnly Property AsyncWaitHandle As WaitHandle

속성 값

비동기 작업이 완료될 때까지 기다리는 데 사용하는 WaitHandle입니다.A WaitHandle that is used to wait for an asynchronous operation to complete.

예제

다음 예제에서는 사용 하는 방법에 설명 합니다 AsyncWaitHandle 가져올 속성은 WaitHandle, 및 대리자에 대 한 비동기 호출 대기 하는 방법.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. 비동기 호출이 완료되면 WaitHandle 은 신호를 받으며 WaitOne 메서드를 호출하여 대기할 수 있습니다.The WaitHandle is signaled when the asynchronous call completes, and you can wait for it by calling the WaitOne method.

이 예제에서는 두 개의 클래스로 이루어져: 비동기적으로 호출 되는 메서드 및 포함 하는 클래스를 포함 하는 클래스는 Main 메서드 호출을 수행 하 합니다.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.

자세한 내용 및 대리자를 사용 하 여 메서드를 비동기적으로 호출 하는 더 많은 예제를 참조 하세요 Calling Synchronous Methods Asynchronously합니다.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.".

설명

클라이언트 폴링 대신 완료 하기 위해 비동기 작업에 대 한 대기 허용 된 반환 값 IsCompleted 작업이 완료 될 때까지 합니다.The return value allows the client to wait for an asynchronous operation to complete instead of polling IsCompleted until the operation concludes. 값을 반환 하는 데 사용할 수는 WaitOne, WaitAny, 또는 WaitAll 작업 합니다.The return value can be used to perform a WaitOne, WaitAny, or WaitAll operation.

공용 언어 런타임에서 제공 대기 가능 개체의 수와 같은 ManualResetEvent, AutoResetEvent, 및 Mutex, Win32 동기화 기본형을 미러 모두 합니다.The common language runtime supplies a number of waitable objects, such as ManualResetEvent, AutoResetEvent, and Mutex, all of which mirror Win32 synchronization primitives.

구현자 참고

구현 하는 개체 IAsyncResult 만들 필요가 없습니다 합니다 WaitHandle 때까지 AsyncWaitHandle 속성이 읽기.The object that implements IAsyncResult does not need to create the WaitHandle until the AsyncWaitHandle property is read. 선택한 것을 IAsyncResult 구현자 합니다.It is the choice of the IAsyncResult implementer. 그러나 구현자를 만드는 경우 AsyncWaitHandle, 것은 신호 구현자의 책임을 WaitHandle 는 적절 한 시간 대기를 종료 합니다.However, if the implementer creates AsyncWaitHandle, it is the responsibility of the implementer to signal the WaitHandle that will terminate the wait at the appropriate time. 예를 들어 AsyncResult 를 비동기적으로 호출 된 메서드가 반환 될 때 호출자를 대신 하 여 대기를 종료 합니다.For example, AsyncResult terminates the wait on behalf of the caller when an asynchronously invoked method returns. 일단 만들어지면 AsyncWaitHandle 해야 활성 상태로 유지 하도록 사용자를 비동기 작업을 끝내는 메서드를 호출할 때까지 합니다.Once created, AsyncWaitHandle should be kept alive until the user calls the method that concludes the asynchronous operation. 뒤의 개체가 당시 AsyncWaitHandle 삭제할 수 있습니다.At that time the object behind AsyncWaitHandle can be discarded.

호출자 참고

작업이 완료 (폴링하는) 대기 하는 클라이언트에서 대기 하도록 동기화 개체를 가져오려면이 속성을 사용 합니다.Clients that wait for the operation to complete (as opposed to polling) use this property to obtain a synchronization object to wait on.

사용 하는 경우는 BeginInvoke 메서드의 대리자를 비동기적으로 메서드를 호출 하 여 결과에서 대기 핸들을 가져오는 IAsyncResult를 사용 하 여 호출 하 여 완료 되는 즉시 대기 핸들을 종료 하는 것이 좋습니다는 Close() 메서드.When you use the BeginInvoke method of a delegate to call a method asynchronously and obtain a wait handle from the resulting IAsyncResult, we recommend that you close the wait handle as soon as you are finished using it, by calling the Close() method. 단순히 대기 핸들에 대 한 모든 참조를 해제 하면 가비지 수집 대기 핸들을 회수 하지만 삭제 가능한 개체는 명시적으로 닫히거나 삭제 하는 경우 가비지 수집 보다 효율적으로 작동 하는 경우 시스템 리소스가 해제 됩니다.If you simply release all references to the wait handle, system resources are freed when garbage collection reclaims the wait handle, but garbage collection works more efficiently when disposable objects are explicitly closed or disposed. 자세한 내용은 AsyncWaitHandle 속성을 참조하세요.For more information, see the AsyncWaitHandle property.

적용 대상