MessageQueueEnumerator 类

定义

public ref class MessageQueueEnumerator : MarshalByRefObject, IDisposable, System::Collections::IEnumerator

public class MessageQueueEnumerator : MarshalByRefObject, IDisposable, System.Collections.IEnumerator

type MessageQueueEnumerator = class
    inherit MarshalByRefObject
    interface IEnumerator
    interface IDisposable

Public Class MessageQueueEnumerator
Inherits MarshalByRefObject
Implements IDisposable, IEnumerator

继承

Object

MarshalByRefObject

MessageQueueEnumerator

实现

IEnumerator IDisposable

示例

下面的代码示例循环访问网络中的所有消息队列，并检查每个队列的路径。 最后，它显示网络上的公共队列数。

#using <System.dll>
#using <System.Messaging.dll>

using namespace System;
using namespace System::Messaging;

//**************************************************
// Iterates through message queues and examines the
// path for each queue. Also displays the number of
// public queues on the network.
//**************************************************
void ListPublicQueues()
{
   
   // Holds the count of private queues.
   int numberQueues = 0;
   
   // Get a cursor into the queues on the network.
   MessageQueueEnumerator^ myQueueEnumerator = MessageQueue::GetMessageQueueEnumerator();
   
   // Move to the next queue and read its path.
   while ( myQueueEnumerator->MoveNext() )
   {
      
      // Increase the count if priority is Lowest.
      Console::WriteLine( myQueueEnumerator->Current->Path );
      numberQueues++;
   }

   
   // Display final count.
   Console::WriteLine( "Number of public queues: {0}", numberQueues );
   return;
}


//**************************************************
// Provides an entry point into the application.
//   
// This example uses a cursor to step through the
// message queues and list the public queues on the
// network.
//**************************************************
int main()
{
   
   // Output the count of Lowest priority messages.
   ListPublicQueues();
}

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 uses a cursor to step through the
        // message queues and list the public queues on the
        // network.
        //**************************************************

        public static void Main()
        {
            // Create a new instance of the class.
            MyNewQueue myNewQueue = new MyNewQueue();

            // Output the count of Lowest priority messages.
            myNewQueue.ListPublicQueues();
                        
            return;
        }

        //**************************************************
        // Iterates through message queues and examines the
        // path for each queue. Also displays the number of
        // public queues on the network.
        //**************************************************
        
        public void ListPublicQueues()
        {
            // Holds the count of private queues.
            uint numberQueues = 0;
    
            // Get a cursor into the queues on the network.
            MessageQueueEnumerator myQueueEnumerator =
                MessageQueue.GetMessageQueueEnumerator();

            // Move to the next queue and read its path.
            while(myQueueEnumerator.MoveNext())
            {
                // Increase the count if priority is Lowest.
                Console.WriteLine(myQueueEnumerator.Current.Path);
                numberQueues++;
            }

            // Display final count.
            Console.WriteLine("Number of public queues: " +
                numberQueues.ToString());
            
            return;
        }
    }
}

Imports System.Messaging



Public Class MyNewQueue


        
        ' Provides an entry point into the application.
        '		 
        ' This example uses a cursor to step through the
        ' message queues and list the public queues on the
        ' network.
        

        Public Shared Sub Main()

            ' Create a new instance of the class.
            Dim myNewQueue As New MyNewQueue()

            ' Output the count of Lowest priority messages.
            myNewQueue.ListPublicQueues()

            Return

        End Sub


        
        ' Iterates through message queues and examines the
        ' path for each queue. Also displays the number of
        ' public queues on the network.
        

        Public Sub ListPublicQueues()

            ' Holds the count of private queues.
            Dim numberQueues As Int32 = 0

            ' Get a cursor into the queues on the network.
            Dim myQueueEnumerator As MessageQueueEnumerator = _
                MessageQueue.GetMessageQueueEnumerator()

            ' Move to the next queue and read its path.
            While myQueueEnumerator.MoveNext()
                ' Increase the count if the priority is Lowest.
                Console.WriteLine(myQueueEnumerator.Current.Path)
                numberQueues += 1
            End While

            ' Display final count.
            Console.WriteLine(("Number of public queues: " + _
                numberQueues.ToString()))

            Return

        End Sub

End Class

注解

用于 MessageQueueEnumerator 与网络上的队列进行动态交互。 通过 MessageQueue 类提供的方法可以返回一个MessageQueueEnumerator包含队列动态列表的 ，也可以返回一个数组，该数组包含调用指定方法时队列集合快照。

网络中没有定义的队列顺序。 例如，它们不会按计算机、标签、公共或专用状态或其他用户可访问的条件进行排序。 是 MessageQueueEnumerator 一个游标，初始化为动态列表的头。 可以通过调用 MoveNext将游标移动到枚举的第一个队列。 初始化枚举器后，可以使用 MoveNext 单步执行剩余队列。

不能使用 MessageQueueEnumerator向后单步执行 。 游标仅允许在队列枚举中向前移动。 但是，可以调用 Reset 来重置枚举，并将光标再次放在列表的开头。 由于枚举器是动态的，因此枚举器可以访问超出游标当前位置的队列。 在游标当前位置之前插入的队列如果不首先调用 Reset，则无法访问该队列。

属性

方法

显式接口实现

适用于

另请参阅

• MessageQueue
• GetMessageQueueEnumerator()