MessageQueueEnumerator 類別

定義

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

繼承

Object

MarshalByRefObject

MessageQueueEnumerator

實作

IEnumerator IDisposable

範例

以下程式碼範例遍歷網路中所有訊息佇列，並檢視每個佇列的路徑。 最後，它會顯示網路上的公共佇列數量。

#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

備註

用於 MessageQueueEnumerator 與網路佇列的動態互動。 透過該 MessageQueue 類別可用的方法可以回傳包含動態佇列清單的 ， MessageQueueEnumerator 或是陣列，該陣列包含指定方法被呼叫時的佇列集合快照。

網路中沒有明確的佇列順序。 例如，它們不會依電腦、標籤、公開或私有狀態或其他使用者可及標準排序。 A MessageQueueEnumerator 是一個游標，初始化為動態列表的開頭。 你可以透過呼叫 MoveNext將游標移動到列舉的第一個佇列。 列舉器初始化後，你可以繼續 MoveNext 向前跨越剩餘的佇列。

無法用 後退。MessageQueueEnumerator 游標只允許在佇列列舉中前進。 不過，你可以呼叫 Reset 重置列舉，並將游標重新放在列表開頭。 由於列舉器是動態的，列舉器可以存取超出游標當前位置的隊列。 在游標目前位置之前插入的隊列，必須先呼叫重置才能存取。

另請參閱

• MessageQueue
• GetMessageQueueEnumerator()