MessageQueue.GetMessageQueueEnumerator 方法

定义

命名空间:
System.Messaging
程序集:
System.Messaging.dll

为网络上公共队列的动态列表创建枚举器对象。

重载

名称 说明
GetMessageQueueEnumerator()

提供仅向前游标语义，用于枚举网络上的所有公共队列。
GetMessageQueueEnumerator(MessageQueueCriteria)

提供仅向前游标语义，以枚举网络上满足指定条件的所有公共队列。

GetMessageQueueEnumerator()

提供仅向前游标语义，用于枚举网络上的所有公共队列。

public:
 static System::Messaging::MessageQueueEnumerator ^ GetMessageQueueEnumerator();
public static System.Messaging.MessageQueueEnumerator GetMessageQueueEnumerator();
static member GetMessageQueueEnumerator : unit -> System.Messaging.MessageQueueEnumerator
Public Shared Function GetMessageQueueEnumerator () As MessageQueueEnumerator

返回

MessageQueueEnumerator

提供 MessageQueueEnumerator 网络上所有公共消息队列的动态列表。

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

此重载 GetMessageQueueEnumerator 返回网络上所有公共队列的枚举。

由于游标与动态列表相关联，因此枚举反映了对队列列表所做的任何修改，以便删除或添加到游标当前位置之外。 不会反映游标当前位置之前的队列的添加或删除。 例如，枚举器可以自动访问追加到游标位置之外的队列，但不能访问在该位置之前插入的队列。 但是，可以通过调用 ResetMessageQueueEnumerator 来重置枚举，从而将光标移回列表的开头。

网络中没有定义的队列排序。 枚举器不按计算机、标签、公共或专用状态或任何其他可访问条件对它们进行排序。

如果需要网络上队列的静态快照，而不是与其建立动态连接，请调用 GetPublicQueues 或 GetPrivateQueuesByMachine(String)。 这两种方法中的每一个都返回一个 MessageQueue 对象数组，这些对象表示调用该方法时队列。

下表显示了此方法在各种工作组模式下是否可用。

工作组模式 可用
本地计算机 No
本地计算机和直接格式名称 No
远程计算机 No
远程计算机和直接格式名称 No

另请参阅

适用于

GetMessageQueueEnumerator(MessageQueueCriteria)

提供仅向前游标语义，以枚举网络上满足指定条件的所有公共队列。

public:
 static System::Messaging::MessageQueueEnumerator ^ GetMessageQueueEnumerator(System::Messaging::MessageQueueCriteria ^ criteria);
public static System.Messaging.MessageQueueEnumerator GetMessageQueueEnumerator(System.Messaging.MessageQueueCriteria criteria);
static member GetMessageQueueEnumerator : System.Messaging.MessageQueueCriteria -> System.Messaging.MessageQueueEnumerator
Public Shared Function GetMessageQueueEnumerator (criteria As MessageQueueCriteria) As MessageQueueEnumerator

参数

criteria
MessageQueueCriteria

包含用于筛选可用消息队列的条件的 A MessageQueueCriteria 。

返回

MessageQueueEnumerator

提供 MessageQueueEnumerator 网络上公共消息队列的动态列表，满足参数指定的 criteria 限制。

示例

下面的代码示例循环访问消息队列，并显示在最后一天创建且存在于计算机“MyComputer”上的每个队列的路径。

#using <system.dll>
#using <system.messaging.dll>

using namespace System;
using namespace System::Messaging;
ref class MyNewQueue
{
public:

   // Iterates through message queues and displays the
   // path of each queue that was created in the last
   // day and that exists on the computer "MyComputer". 
   void ListPublicQueuesByCriteria()
   {
      UInt32 numberQueues = 0;
      
      // Specify the criteria to filter by.
      MessageQueueCriteria^ myCriteria = gcnew MessageQueueCriteria;
      myCriteria->MachineName = "MyComputer";
      myCriteria->CreatedAfter = DateTime::Now.Subtract( TimeSpan(1,0,0,0) );
      
      // Get a cursor into the queues on the network.
      MessageQueueEnumerator^ myQueueEnumerator = MessageQueue::GetMessageQueueEnumerator( myCriteria );
      
      // 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++;
      }

      
      // Handle no queues matching the criteria.
      if ( numberQueues == 0 )
      {
         Console::WriteLine( "No public queues match criteria." );
      }

      return;
   }

};

int main()
{
   
   // Create a new instance of the class.
   MyNewQueue^ myNewQueue = gcnew MyNewQueue;
   
   // Output the count of Lowest priority messages.
   myNewQueue->ListPublicQueuesByCriteria();
   return 0;
}

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 that specify certain criteria.
        //**************************************************

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

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

        //**************************************************
        // Iterates through message queues and displays the
        // path of each queue that was created in the last
        // day and that exists on the computer "MyComputer".
        //**************************************************
        
        public void ListPublicQueuesByCriteria()
        {
            uint numberQueues = 0;
            
            // Specify the criteria to filter by.
            MessageQueueCriteria myCriteria = new
                MessageQueueCriteria();
            myCriteria.MachineName = "MyComputer";
            myCriteria.CreatedAfter = DateTime.Now.Subtract(new
                TimeSpan(1,0,0,0));

            // Get a cursor into the queues on the network.
            MessageQueueEnumerator myQueueEnumerator =
                MessageQueue.GetMessageQueueEnumerator(myCriteria);

            // 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++;
            }

            // Handle no queues matching the criteria.
            if (numberQueues == 0)
            {
                Console.WriteLine("No public queues match criteria.");
            }

            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 that specify certain criteria.
        

        Public Shared Sub Main()

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

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

            Return

        End Sub


        
        ' Iterates through message queues and displays the
        ' path of each queue that was created in the last
        ' day and that exists on the computer "MyComputer". 
        

        Public Sub ListPublicQueuesByCriteria()

            Dim numberQueues As Int32 = 0

            ' Specify the criteria to filter by.
            Dim myCriteria As New MessageQueueCriteria()
            myCriteria.MachineName = "MyComputer"
            myCriteria.CreatedAfter = DateTime.Now.Subtract(New _
                TimeSpan(1, 0, 0, 0))


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

            ' 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

            ' Handle no queues matching the criteria.
            If numberQueues = 0 Then
                Console.WriteLine("No queues match the criteria.")
            End If

            Return

        End Sub

End Class

注解

此重载 GetMessageQueueEnumerator 返回网络上满足应用程序条件定义条件的所有公共队列的列表。 可以指定要包括的条件，例如队列创建或修改时间、计算机名称、标签、类别或这些条件的任意组合。

由于游标与动态列表相关联，因此枚举反映了对超出游标当前位置的队列所做的任何修改。 不会反映游标当前位置之前对队列所做的更改。 例如，枚举器可以自动访问追加到游标位置之外的队列，但不能访问在该位置之前插入的队列。 但是，可以通过调用 ResetMessageQueueEnumerator 来重置枚举，从而将光标移回列表的开头。

网络中没有定义的队列排序。 枚举器不按计算机、标签、公共或专用状态或任何其他可访问条件对它们进行排序。

如果需要网络上队列的静态快照，而不是与其建立动态连接，请指定或调用GetPrivateQueuesByMachine(String)的条件GetPublicQueues。 这两种方法中的每一个都返回一个 MessageQueue 对象数组，这些对象表示调用该方法时队列。 调用 GetPublicQueuesByCategory(Guid)， GetPublicQueuesByLabel(String)或 GetPublicQueuesByMachine(String) 提供与调用 GetPublicQueues 相同的结果，其筛选条件 Category分别为， Label以及 MachineName。

下表显示了此方法在各种工作组模式下是否可用。

工作组模式 可用
本地计算机 No
本地计算机和直接格式名称 No
远程计算机 No
远程计算机和直接格式名称 No

另请参阅

适用于