IAsyncResult 인터페이스

정의

비동기 작업의 상태를 나타냅니다.Represents the status of an asynchronous operation.

public interface class IAsyncResult
[System.Runtime.InteropServices.ComVisible(true)]
public interface IAsyncResult
type IAsyncResult = interface
Public Interface IAsyncResult
파생
특성

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

IAsyncResult 인터페이스는 비동기적으로 작동할 수 있는 메서드를 포함 하는 클래스로 구현 됩니다.The IAsyncResult interface is implemented by classes containing methods that can operate asynchronously. 와 같은 비동기 작업을 시작 하는 메서드의 반환 형식인 것 FileStream.BeginRead와 같은 비동기 작업을 끝내는 메서드에 전달 됩니다 FileStream.EndRead합니다.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 개체를 호출한 메서드에 전달도 AsyncCallback 비동기 작업이 완료 되 면 위임 합니다.IAsyncResult objects are also passed to methods invoked by AsyncCallback delegates when an asynchronous operation completes.

지 원하는 개체를 IAsyncResult 인터페이스는 비동기 작업에 대 한 상태 정보를 저장 하 고 스레드는 작업이 완료 될 때 신호를 보낼 수 있도록 동기화 개체를 제공 합니다.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.

참고

AsyncResult 클래스의 구현인 IAsyncResult 에서 반환 하는 BeginInvoke 대리자를 사용 하 여 비동기로 메서드를 호출 하는 메서드.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.

에 대 한 자세한 설명은 하는 방법을 IAsyncResult 내용은 인터페이스를 사용 합니다 Calling Synchronous Methods Asynchronously 항목입니다.For a detailed description of how the IAsyncResult interface is used, see the Calling Synchronous Methods Asynchronously topic.

속성

AsyncState

비동기 작업을 한정하거나 정보를 포함하는 사용자 정의 개체를 가져옵니다.Gets a user-defined object that qualifies or contains information about an asynchronous operation.

AsyncWaitHandle

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

CompletedSynchronously

비동기 작업이 동기적으로 완료되었는지 여부를 나타내는 값을 가져옵니다.Gets a value that indicates whether the asynchronous operation completed synchronously.

IsCompleted

비동기 작업이 완료되었는지 여부를 나타내는 값을 가져옵니다.Gets a value that indicates whether the asynchronous operation has completed.

적용 대상