ReceiveCompletedEventHandler 代理人

定義

命名空間:

System.Messaging

組件:

System.Messaging.dll

代表將處理 ReceiveCompleted 之 MessageQueue 事件的方法。

C#

public delegate void ReceiveCompletedEventHandler(object sender, ReceiveCompletedEventArgs e);

參數

sender

Object

事件的來源：MessageQueue。

e

ReceiveCompletedEventArgs

ReceiveCompletedEventArgs，其中包含事件資料。

範例

下列程式代碼範例說明如何為事件處理程式建立事件委派 (ReceiveCompletedEventHandler) (MyReceiveCompleted) ，並將其與 MessageQueue.ReceiveCompleted 事件產生關聯。 事件處理程式會從佇列接收訊息，並將其標籤寫入畫面。

C#

using System;
using System.Messaging;

namespace MyProject
{
    /// <summary>
    /// Provides a container class for the example.
    /// </summary>
    public class MyNewQueue
    {

        //**************************************************
        // Provides an entry point into the application.
        //		
        // This example performs asynchronous receive operation
        // processing.
        //**************************************************

        public static void Main()
        {
            // Create an instance of MessageQueue. Set its formatter.
            MessageQueue myQueue = new MessageQueue(".\\myQueue");
            myQueue.Formatter = new XmlMessageFormatter(new Type[]
                {typeof(String)});

            // Add an event handler for the ReceiveCompleted event.
            myQueue.ReceiveCompleted += new
                ReceiveCompletedEventHandler(MyReceiveCompleted);
            
            // Begin the asynchronous receive operation.
            myQueue.BeginReceive();
            
            // Do other work on the current thread.

            return;
        }

        //**************************************************
        // Provides an event handler for the ReceiveCompleted
        // event.
        //**************************************************
        
        private static void MyReceiveCompleted(Object source,
            ReceiveCompletedEventArgs asyncResult)
        {
            // Connect to the queue.
            MessageQueue mq = (MessageQueue)source;

            // End the asynchronous Receive operation.
            Message m = mq.EndReceive(asyncResult.AsyncResult);

            // Display message information on the screen.
            Console.WriteLine("Message: " + (string)m.Body);

            // Restart the asynchronous Receive operation.
            mq.BeginReceive();
            
            return;
        }
    }
}

備註

建立 ReceiveCompletedEventHandler 委派時，必須識別處理事件的方法。 若要使事件與您的事件處理常式產生關聯，請將委派的執行個體 (Instance) 加入至事件。 除非您移除委派，否則每當事件發生時就會呼叫事件處理常式。 如需事件處理程式委派的詳細資訊，請參閱 處理和引發事件。

擴充方法

GetMethodInfo(Delegate)

取得表示特定委派所代表之方法的物件。

適用於

另請參閱

• MessageQueue
• PeekCompletedEventHandler
• ReceiveCompletedEventArgs