AsyncResult 類別

定義

封裝委派上非同步作業的結果。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
繼承
AsyncResult
屬性
實作

範例

下列範例示範如何使用AsyncWaitHandle屬性來WaitHandle取得, 以及如何等待委派的非同步呼叫。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. 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。The WaitHandle is signaled when the asynchronous call completes, and you can wait for it by calling the WaitOne method.

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Main進行呼叫之方法的類別。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.

如需詳細資訊以及使用委派以非同步方式呼叫方法的更多範例, 請參閱以非同步方式呼叫同步方法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.".

備註

AsyncResult類別會與使用委派所建立的非同步方法呼叫搭配使用。The AsyncResult class is used in conjunction with asynchronous method calls made using delegates. IAsyncResult委派的BeginInvoke方法傳回的AsyncResult可以轉換成。The IAsyncResult returned from the delegate's BeginInvoke method can be cast to an AsyncResult. AsyncResult 具有屬性,它會保存用來叫用非同步AsyncDelegate呼叫的委派物件。The AsyncResult has the AsyncDelegate property that holds the delegate object on which the asynchronous call was invoked.

如需使用委派BeginInvoke進行非同步呼叫的詳細資訊, 請參閱使用委派進行非同步程式設計For more information about BeginInvoke and asynchronous calls using delegates, see Asynchronous Programming Using Delegates.

屬性

AsyncDelegate

取得叫用非同步呼叫時所在的委派物件。Gets the delegate object on which the asynchronous call was invoked.

AsyncState

取得被當做 BeginInvoke 方法呼叫的最後參數來提供的物件。Gets the object provided as the last parameter of a BeginInvoke method call.

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。Gets a WaitHandle that encapsulates Win32 synchronization handles, and allows the implementation of various synchronization schemes.

CompletedSynchronously

取得值,指出 BeginInvoke 呼叫是否同步完成。Gets a value indicating whether the BeginInvoke call completed synchronously.

EndInvokeCalled

取得或設定值,指出是否已經在目前 AsyncResult 上呼叫 EndInvokeGets or sets a value indicating whether EndInvoke has been called on the current AsyncResult.

IsCompleted

取得或設定值,指出伺服器是否已經完成呼叫。Gets a value indicating whether the server has completed the call.

NextSink

取得接收鏈結中的下一個訊息接收。Gets the next message sink in the sink chain.

方法

AsyncProcessMessage(IMessage, IMessageSink)

實作 IMessageSink 介面。Implements the IMessageSink interface.

Equals(Object)

判斷指定的物件是否等於目前的物件。Determines whether the specified object is equal to the current object.

(繼承來源 Object)
GetHashCode()

作為預設雜湊函數。Serves as the default hash function.

(繼承來源 Object)
GetReplyMessage()

取得非同步呼叫的回應訊息。Gets the response message for the asynchronous call.

GetType()

取得目前執行個體的 TypeGets the Type of the current instance.

(繼承來源 Object)
MemberwiseClone()

建立目前 Object 的淺層複製。Creates a shallow copy of the current Object.

(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。Sets an IMessageCtrl for the current remote method call, which provides a way to control asynchronous messages after they have been dispatched.

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。Synchronously processes a response message returned by a method call on a remote object.

ToString()

傳回代表目前物件的字串。Returns a string that represents the current object.

(繼承來源 Object)

適用於

另請參閱