MessagePropertyFilter.Priority プロパティ

.NET Framework クラス ライブラリ リファレンス

MessagePropertyFilter.Priority プロパティ

メッセージを受信またはピークするときに Message.Priority プロパティ情報を取得するかどうかを示す値を取得または設定します。

名前空間: System.Messaging
アセンブリ: System.Messaging (system.messaging.dll 内)
構文

Visual Basic (宣言)

Public Property Priority As
 Boolean

Visual Basic (使用法)

Dim instance As MessagePropertyFilter
Dim value As Boolean

value = instance.Priority

instance.Priority = value

C#

public bool Priority { get;
 set; }

C++

public:
property bool Priority {
    bool get ();
    void set (bool value);
}

J#

/** @property */
public boolean get_Priority ()

/** @property */
public void set_Priority (boolean value)

JScript

public function get Priority
 () : boolean

public function set Priority
 (value : boolean)

プロパティ値
Message.Priority 情報を受信する場合は true。それ以外の場合は false。既定値は false です。

解説

Message クラスの Priority プロパティは、メッセージが送信先に到達するまでの間のメッセージ キューによる処理方法、およびメッセージが送信先に到達したときにキュー内に挿入されるメッセージの位置に影響します。

メッセージの優先順位を設定することが意味を持つのは、非トランザクション メッセージの場合だけです。トランザクション メッセージの優先順位は、自動的に 0 に設定されます。つまり、トランザクション メッセージの優先順位は無視されます。

使用例

優先度が異なる 2 つのメッセージをキューに送信し、順番に取得するコード例を次に示します。

Visual Basic

Imports System
Imports System.Messaging


'Provides a container class for the example.
Public Class MyNewQueue
      
      

      ' Provides an entry point into the application.
      '         
      ' This example sends and receives a message from
      ' a queue.

      Public Shared Sub
 Main()
         ' Create a new instance of the class.
         Dim myNewQueue As New
 MyNewQueue()
         
         ' Send messages to a queue.
         myNewQueue.SendMessage(MessagePriority.Normal, "First
 Message Body.")
         myNewQueue.SendMessage(MessagePriority.Highest, "Second
 Message Body.")
         
         ' Receive messages from a queue.
         myNewQueue.ReceiveMessage()
         myNewQueue.ReceiveMessage()
         
         Return
      End Sub 'Main
      
      
      

      ' Sends a string message to a queue.

      Public Sub SendMessage(priority As
 MessagePriority, messageBody As String)
         
         ' Connect to a queue on the local computer.
         Dim myQueue As New
 MessageQueue(".\myQueue")
         
         ' Create a new message.
         Dim myMessage As New
 Message()
         
         If priority > MessagePriority.Normal Then
            myMessage.Body = "High Priority: " + messageBody
         Else
            myMessage.Body = messageBody
         End If 
         ' Set the priority of the message.
         myMessage.Priority = priority
         
         
         ' Send the Order to the queue.
         myQueue.Send(myMessage)
         
         Return
      End Sub 'SendMessage
      
      
      

      ' Receives a message.

      Public Sub ReceiveMessage()
         ' Connect to the a queue on the local computer.
         Dim myQueue As New
 MessageQueue(".\myQueue")
         
         ' Set the queue to read the priority. By default, it
         ' is not read.
         myQueue.MessageReadPropertyFilter.Priority = True
         
         ' Set the formatter to indicate body contains a string.
         myQueue.Formatter = New XmlMessageFormatter(New
 Type() {GetType(String)})
         
         Try
            ' Receive and format the message. 
            Dim myMessage As Message = myQueue.Receive()
            
            ' Display message information.
            Console.WriteLine(("Priority: " + myMessage.Priority.ToString()))
            Console.WriteLine(("Body: " + myMessage.Body.ToString()))
         
         
         
         ' Handle invalid serialization format.
         Catch e As InvalidOperationException
            Console.WriteLine(e.Message)
         End Try
         
         ' Catch other exceptions as necessary.
         Return
      End Sub 'ReceiveMessage
   End Class 'MyNewQueue

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 sends and receives a message from
        // a queue.
        //**************************************************

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

            // Send messages to a queue.
            myNewQueue.SendMessage(MessagePriority.Normal, "First Message Body.");
            myNewQueue.SendMessage(MessagePriority.Highest, "Second Message
 Body.");

            // Receive messages from a queue.
            myNewQueue.ReceiveMessage(); 
            myNewQueue.ReceiveMessage();

            return;
        }


        //**************************************************
        // Sends a string message to a queue.
        //**************************************************
        
        public void SendMessage(MessagePriority
 priority, string messageBody)
        {

            // Connect to a queue on the local computer.
            MessageQueue myQueue = new MessageQueue(".\\myQueue");

            // Create a new message.
            Message myMessage = new Message();

            if(priority > MessagePriority.Normal)
            {
                myMessage.Body = "High Priority: " + messageBody;
            }
            else myMessage.Body = messageBody;

            // Set the priority of the message.
            myMessage.Priority = priority;


            // Send the Order to the queue.
            myQueue.Send(myMessage);

            return;
        }


        //**************************************************
        // Receives a message.
        //**************************************************
        
        public  void ReceiveMessage()
        {
            // Connect to the a queue on the local computer.
            MessageQueue myQueue = new MessageQueue(".\\myQueue");

            // Set the queue to read the priority. By default, it
            // is not read.
            myQueue.MessageReadPropertyFilter.Priority = true;

            // Set the formatter to indicate body contains a string.
            myQueue.Formatter = new XmlMessageFormatter(new
 Type[]
                {typeof(string)});
            
            try
            {
                // Receive and format the message. 
                Message myMessage =    myQueue.Receive(); 

                // Display message information.
                Console.WriteLine("Priority: " + 
                    myMessage.Priority.ToString());
                Console.WriteLine("Body: " + 
                    myMessage.Body.ToString());
            }
            
            catch (MessageQueueException)
            {
                // Handle Message Queuing exceptions.
            }

            // Handle invalid serialization format.
            catch (InvalidOperationException e)
            {
                Console.WriteLine(e.Message);
            }
            
            // Catch other exceptions as necessary.

            return;
        }
    }
}

C++

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

using namespace System;
using namespace System::Messaging;

/// <summary>
/// Provides a container class for the example.
/// </summary>
ref class MyNewQueue
{
   //**************************************************
   // Sends a string message to a queue.
   //**************************************************
public:
   void SendMessage( MessagePriority priority, String^ messageBody
 )
   {
      // Connect to a queue on the local computer.
      MessageQueue^ myQueue = gcnew MessageQueue( ".\\myQueue" );

      // Create a new message.
      Message^ myMessage = gcnew Message;
      if ( priority > MessagePriority::Normal )
      {
         myMessage->Body = "High Priority: {0}",messageBody;
      }
      else
      {
         myMessage->Body = messageBody;
      }

      // Set the priority of the message.
      myMessage->Priority = priority;

      // Send the Order to the queue.
      myQueue->Send( myMessage );

      return;
   }

   //**************************************************
   // Receives a message.
   //**************************************************
   void ReceiveMessage()
   {
      // Connect to the a queue on the local computer.
      MessageQueue^ myQueue = gcnew MessageQueue( ".\\myQueue" );

      // Set the queue to read the priority. By default, it
      // is not read.
      myQueue->MessageReadPropertyFilter->Priority = true;

      // Set the formatter to indicate body contains a String^.
      array<Type^>^ p = gcnew array<Type^>(1);
      p[ 0 ] = String::typeid;
      myQueue->Formatter = gcnew XmlMessageFormatter( p );
      try
      {
         // Receive and format the message. 
         Message^ myMessage = myQueue->Receive();

         // Display message information.
         Console::WriteLine( "Priority: {0}",
            myMessage->Priority );
         Console::WriteLine( "Body: {0}",
            myMessage->Body );
      }
      catch ( MessageQueueException^ ) 
      {
         // Handle Message Queuing exceptions.
      }
      // Handle invalid serialization format.
      catch ( InvalidOperationException^ e ) 
      {
         Console::WriteLine( e->Message );
      }

      // Catch other exceptions as necessary.

      return;
   }
};

//**************************************************
// Provides an entry point into the application.
//         
// This example sends and receives a message from
// a queue.
//**************************************************
int main()
{
   // Create a new instance of the class.
   MyNewQueue^ myNewQueue = gcnew MyNewQueue;

   // Send messages to a queue.
   myNewQueue->SendMessage( MessagePriority::Normal, "First Message Body."
 );
   myNewQueue->SendMessage( MessagePriority::Highest, "Second Message Body."
 );

   // Receive messages from a queue.
   myNewQueue->ReceiveMessage();
   myNewQueue->ReceiveMessage();

   return 0;
}

J#

package MyProject;

import System.*;
import System.Messaging.*;

/// <summary>
/// Provides a container class for the example.
/// </summary>
public class MyNewQueue
{
    //**************************************************
    // Provides an entry point into the application.
    //         
    // This example sends and receives a message from
    // a queue.
    //**************************************************
    public static void main(String[]
 args)
    {
        // Create a new instance of the class.
        MyNewQueue myNewQueue = new MyNewQueue();
        // Send messages to a queue.
        myNewQueue.SendMessage(MessagePriority.Normal, "First Message Body.");
        myNewQueue.SendMessage(MessagePriority.Highest, "Second Message Body.");
        // Receive messages from a queue.
        myNewQueue.ReceiveMessage();
        myNewQueue.ReceiveMessage();
        return;
    } //main

    //**************************************************
    // Sends a string message to a queue.
    //**************************************************
    public void SendMessage(MessagePriority
 priority, String messageBody)
    {
        // Connect to a queue on the local computer.
        MessageQueue myQueue = new MessageQueue(".\\myQueue");
        // Create a new message.
        Message myMessage = new Message();

        if (priority.CompareTo(MessagePriority.Normal) > 0)
 {
            myMessage.set_Body("High Priority: " + messageBody);
        }
        else {
            myMessage.set_Body(messageBody);
        }
        // Set the priority of the message.
        myMessage.set_Priority(priority);
        // Send the Order to the queue.
        myQueue.Send(myMessage);
        return;
    } //SendMessage

    //**************************************************
    // Receives a message.
    //**************************************************
    public void ReceiveMessage()
    {
        // Connect to the a queue on the local computer.
        MessageQueue myQueue = new MessageQueue(".\\myQueue");
        // Set the queue to read the priority. By default, it
        // is not read.
        myQueue.get_MessageReadPropertyFilter().set_Priority(true);
        // Set the formatter to indicate body contains a string.
        myQueue.set_Formatter(new XmlMessageFormatter(new
 Type[]
            { String.class.ToType() }));
        try {
            // Receive and format the message. 
            Message myMessage = myQueue.Receive();
            // Display message information.
            Console.WriteLine("Priority: " + myMessage.get_Priority().ToString());
            Console.WriteLine("Body: " + myMessage.get_Body().ToString());
        }
        catch (MessageQueueException exp) {
            // Handle Message Queuing exceptions.
        }            
        // Handle invalid serialization format.
        catch (InvalidOperationException e) {
            Console.WriteLine(e.get_Message());
        }
        // Catch other exceptions as necessary.
        return;
    } //ReceiveMessage
} //MyNewQueue

.NET Framework のセキュリティ

• 直前の呼び出し元に対する完全な信頼。このメンバは、部分的に信頼されているコードから使用することはできません。詳細については、「」を参照してください。

プラットフォーム

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。

バージョン情報

.NET Framework
サポート対象 : 2.0、1.1、1.0
.NET Compact Framework
サポート対象 : 2.0

参照

関連項目
MessagePropertyFilter クラス
MessagePropertyFilter メンバ
System.Messaging 名前空間
Message.Priority プロパティ
MessageQueue