AsyncResult 類別

參考

定義

命名空間:: System.Runtime.Remoting.Messaging

組件:: mscorlib.dll

重要

部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。

封裝委派上非同步作業的結果。

public ref class AsyncResult : IAsyncResult, System::Runtime::Remoting::Messaging::IMessageSink

public 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

[<System.Runtime.InteropServices.ComVisible(true)>]
type AsyncResult = class
    interface IAsyncResult
    interface IMessageSink

Public Class AsyncResult
Implements IAsyncResult, IMessageSink

繼承: Object
AsyncResult

屬性: ComVisibleAttribute

實作: IAsyncResult IMessageSink

範例

下列範例示範如何使用 AsyncWaitHandle 屬性來取得 WaitHandle ，以及如何等候委派上的非同步呼叫。非同步呼叫完成時， WaitHandle 會收到信號，且您可以呼叫 WaitOne 方法來等候它。

此範例包含兩個類別：包含非同步呼叫之方法的類別，以及包含進行呼叫之方法的 Main 類別。

如需使用委派以非同步方式呼叫方法的詳細資訊和更多範例，請參閱以非同步方式呼叫同步方法。

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.".

備註

類別 AsyncResult 會與使用委派進行的非同步方法呼叫搭配使用。 IAsyncResult從委派的方法傳回的 BeginInvoke 可以轉換成 AsyncResult 。 AsyncResult具有屬性， AsyncDelegate 這個屬性會保存叫用非同步呼叫的委派物件。

如需使用委派進行非同步呼叫的詳細資訊 BeginInvoke ，請參閱使用委派進行非同步程式設計。

屬性

AsyncDelegate	取得叫用非同步呼叫時所在的委派物件。
AsyncState	取得被當做 `BeginInvoke` 方法呼叫的最後參數來提供的物件。
AsyncWaitHandle	取得 WaitHandle，它會封裝 Win32 同步控制代碼並允許各種同步配置的實作。
CompletedSynchronously	取得值，指出 `BeginInvoke` 呼叫是否同步完成。
EndInvokeCalled	取得或設定值，指出是否已經在目前 AsyncResult 上呼叫 `EndInvoke`。
IsCompleted	取得或設定值，指出伺服器是否已經完成呼叫。
NextSink	取得接收鏈結中的下一個訊息接收。

方法

AsyncProcessMessage(IMessage, IMessageSink)	實作 IMessageSink 介面。
Equals(Object)	判斷指定的物件是否等於目前的物件。 (繼承來源 Object)
GetHashCode()	做為預設雜湊函式。 (繼承來源 Object)
GetReplyMessage()	取得非同步呼叫的回應訊息。
GetType()	取得目前執行個體的 Type。 (繼承來源 Object)
MemberwiseClone()	建立目前 Object 的淺層複製。 (繼承來源 Object)
SetMessageCtrl(IMessageCtrl)	設定目前遠端方法呼叫的 IMessageCtrl，以便提供非同步訊息分派之後控制它們的方法。
SyncProcessMessage(IMessage)	同步處理由遠端物件上之方法呼叫所傳回的回應訊息。
ToString()	傳回代表目前物件的字串。 (繼承來源 Object)

適用於

另請參閱

使用委派非同步設計程式

AsyncResult 類別

定義

範例

備註

屬性

方法

適用於

另請參閱

其他資源