MessageQueue.MessageReadPropertyFilter Eigenschaft

public:
 property System::Messaging::MessagePropertyFilter ^ MessageReadPropertyFilter { System::Messaging::MessagePropertyFilter ^ get(); void set(System::Messaging::MessagePropertyFilter ^ value); };

[System.ComponentModel.Browsable(false)]
[System.Messaging.MessagingDescription("MQ_MessageReadPropertyFilter")]
public System.Messaging.MessagePropertyFilter MessageReadPropertyFilter { get; set; }

[<System.ComponentModel.Browsable(false)>]
[<System.Messaging.MessagingDescription("MQ_MessageReadPropertyFilter")>]
member this.MessageReadPropertyFilter : System.Messaging.MessagePropertyFilter with get, set

Public Property MessageReadPropertyFilter As MessagePropertyFilter

Eigenschaftswert

Die MessagePropertyFilter von der Warteschlange zum Filtern der Gruppe von Eigenschaften, die er empfängt, oder Vorschauen für jede Nachricht.

Attribute

BrowsableAttribute MessagingDescriptionAttribute

Ausnahmen

Beispiele

Im folgenden Codebeispiel wird die MessageReadPropertyFilter empfangenen Nachrichteneigenschaften eingeschränkt.

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

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

   //*************************************************
   // Retrieves the default properties for a Message.
   //*************************************************
   void RetrieveDefaultProperties()
   {
      // Connect to a message queue.
      MessageQueue^ myQueue = gcnew MessageQueue( ".\\myQueue" );

      // Specify to retrieve the default properties only.
      myQueue->MessageReadPropertyFilter->SetDefaults();

      // Set the formatter for the Message.
      array<Type^>^p = gcnew array<Type^>(1);
      p[ 0 ] = String::typeid;
      myQueue->Formatter = gcnew XmlMessageFormatter( p );

      // Receive the first message in the queue.
      Message^ myMessage = myQueue->Receive();

      // Display selected properties.
      Console::WriteLine( "Label: {0}", myMessage->Label );
      Console::WriteLine( "Body: {0}", static_cast<String^>(myMessage->Body) );
      return;
   }


   //*************************************************
   // Retrieves all properties for a Message.
   //*************************************************
   void RetrieveAllProperties()
   {
      // Connect to a message queue.
      MessageQueue^ myQueue = gcnew MessageQueue( ".\\myQueue" );

      // Specify to retrieve all properties.
      myQueue->MessageReadPropertyFilter->SetAll();

      // Set the formatter for the Message.
      array<Type^>^p = gcnew array<Type^>(1);
      p[ 0 ] = String::typeid;
      myQueue->Formatter = gcnew XmlMessageFormatter( p );

      // Receive the first message in the queue.
      Message^ myMessage = myQueue->Receive();

      // Display selected properties.
      Console::WriteLine( "Encryption algorithm: {0}", myMessage->EncryptionAlgorithm.ToString() );
      Console::WriteLine( "Body: {0}", myMessage->Body );
      return;
   }

   //*************************************************
   // Retrieves application-specific properties for a
   // Message.
   //*************************************************
   void RetrieveSelectedProperties()
   {
      // Connect to a message queue.
      MessageQueue^ myQueue = gcnew MessageQueue( ".\\myQueue" );

      // Specify to retrieve selected properties.
      MessagePropertyFilter^ myFilter = gcnew MessagePropertyFilter;
      myFilter->ClearAll();

      // The following list is a random subset of available properties.
      myFilter->Body = true;
      myFilter->Label = true;
      myFilter->MessageType = true;
      myFilter->Priority = true;
      myQueue->MessageReadPropertyFilter = myFilter;

      // Set the formatter for the Message.
      array<Type^>^p = gcnew array<Type^>(1);
      p[ 0 ] = String::typeid;
      myQueue->Formatter = gcnew XmlMessageFormatter( p );

      // Receive the first message in the queue.
      Message^ myMessage = myQueue->Receive();

      // Display selected properties.
      Console::WriteLine( "Message type: {0}", myMessage->MessageType.ToString() );
      Console::WriteLine( "Priority: {0}", myMessage->Priority.ToString() );
      return;
   }
};


//*************************************************
// Provides an entry point into the application.
//         
// This example retrieves specific groups of Message
// properties.
//*************************************************
int main()
{
   // Create a new instance of the class.
   MyNewQueue^ myNewQueue = gcnew MyNewQueue;

   // Retrieve specific sets of Message properties.
   myNewQueue->RetrieveDefaultProperties();
   myNewQueue->RetrieveAllProperties();
   myNewQueue->RetrieveSelectedProperties();
   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 retrieves specific groups of Message
        // properties.
        //**************************************************

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

            // Retrieve specific sets of Message properties.
            myNewQueue.RetrieveDefaultProperties();
            myNewQueue.RetrieveAllProperties();
            myNewQueue.RetrieveSelectedProperties();

            return;
        }

        //**************************************************
        // Retrieves the default properties for a Message.
        //**************************************************
        
        public void RetrieveDefaultProperties()
        {

            // Connect to a message queue.
            MessageQueue myQueue = new MessageQueue(".\\myQueue");

            // Specify to retrieve the default properties only.
            myQueue.MessageReadPropertyFilter.SetDefaults();

            // Set the formatter for the Message.
            myQueue.Formatter = new XmlMessageFormatter(new Type[]
                {typeof(String)});

            // Receive the first message in the queue.
            Message myMessage = myQueue.Receive();

            // Display selected properties.
            Console.WriteLine("Label: " + myMessage.Label);
            Console.WriteLine("Body: " + (String)myMessage.Body);
    
            return;
        }

        //**************************************************
        // Retrieves all properties for a Message.
        //**************************************************
        
        public void RetrieveAllProperties()
        {

            // Connect to a message queue.
            MessageQueue myQueue = new MessageQueue(".\\myQueue");

            // Specify to retrieve all properties.
            myQueue.MessageReadPropertyFilter.SetAll();

            // Set the formatter for the Message.
            myQueue.Formatter = new XmlMessageFormatter(new Type[]
                {typeof(String)});

            // Receive the first message in the queue.
            Message myMessage = myQueue.Receive();

            // Display selected properties.
            Console.WriteLine("Encryption algorithm: " +
                myMessage.EncryptionAlgorithm.ToString());
            Console.WriteLine("Body: " + (String)myMessage.Body);
    
            return;
        }

        //**************************************************
        // Retrieves application-specific properties for a
        // Message.
        //**************************************************
        
        public void RetrieveSelectedProperties()
        {
            // Connect to a message queue.
            MessageQueue myQueue = new MessageQueue(".\\myQueue");

            // Specify to retrieve selected properties.
            MessagePropertyFilter myFilter = new
                MessagePropertyFilter();
            myFilter.ClearAll();
            // The following list is a random subset of available properties.
            myFilter.Body = true;
            myFilter.Label = true;
            myFilter.MessageType = true;
            myFilter.Priority = true;
            myQueue.MessageReadPropertyFilter = myFilter;

            // Set the formatter for the Message.
            myQueue.Formatter = new XmlMessageFormatter(new Type[]
                {typeof(String)});

            // Receive the first message in the queue.
            Message myMessage = myQueue.Receive();

            // Display selected properties.
            Console.WriteLine("Message type: " +
                myMessage.MessageType.ToString());
            Console.WriteLine("Priority: " +
                myMessage.Priority.ToString());
    
            return;
            }
    }
}

Imports System.Messaging

Public Class MyNewQueue


        
        ' Provides an entry point into the application.
        '		 
        ' This example retrieves specific groups of Message
        ' properties.
        

        Public Shared Sub Main()

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

            ' Retrieve specific sets of Message properties.
            myNewQueue.RetrieveDefaultProperties()
            myNewQueue.RetrieveAllProperties()
            myNewQueue.RetrieveSelectedProperties()

            Return

        End Sub


        
        ' Retrieves the default properties for a Message.
        

        Public Sub RetrieveDefaultProperties()

            ' Connect to a message queue.
            Dim myQueue As New MessageQueue(".\myQueue")

            ' Specify to retrieve the default properties only.
            myQueue.MessageReadPropertyFilter.SetDefaults()

            ' Set the formatter for the Message.
            myQueue.Formatter = New XmlMessageFormatter(New Type() _
                {GetType([String])})

            ' Receive the first message in the queue.
            Dim myMessage As Message = myQueue.Receive()

            ' Display selected properties.
            Console.WriteLine(("Label: " + myMessage.Label))
            Console.WriteLine(("Body: " + CType(myMessage.Body, _
                [String])))

            Return

        End Sub


        
        ' Retrieves all properties for a Message.
        

        Public Sub RetrieveAllProperties()

            ' Connect to a message queue.
            Dim myQueue As New MessageQueue(".\myQueue")

            ' Specify to retrieve all properties.
            myQueue.MessageReadPropertyFilter.SetAll()

            ' Set the formatter for the Message.
            myQueue.Formatter = New XmlMessageFormatter(New Type() _
                {GetType([String])})

            ' Receive the first message in the queue.
            Dim myMessage As Message = myQueue.Receive()

            ' Display selected properties.
            Console.WriteLine(("Encryption algorithm: " + _
                myMessage.EncryptionAlgorithm.ToString()))
            Console.WriteLine(("Body: " + CType(myMessage.Body, _
                [String])))

            Return

        End Sub


        
        ' Retrieves application-specific properties for a
        ' Message.
        

        Public Sub RetrieveSelectedProperties()

            ' Connect to a message queue.
            Dim myQueue As New MessageQueue(".\myQueue")

            ' Specify to retrieve selected properties.
            Dim myFilter As New MessagePropertyFilter()
            myFilter.ClearAll()
            ' The following list is a random subset of properties.
            myFilter.Body = True
            myFilter.Label = True
            myFilter.MessageType = True
            myFilter.Priority = True
            myQueue.MessageReadPropertyFilter = myFilter

            ' Set the formatter for the Message.
            myQueue.Formatter = New XmlMessageFormatter(New Type() _
                {GetType([String])})

            ' Receive the first message in the queue.
            Dim myMessage As Message = myQueue.Receive()

            ' Display selected properties.
            Console.WriteLine(("Message type: " + _
                myMessage.MessageType.ToString()))
            Console.WriteLine(("Priority: " + _
                myMessage.Priority.ToString()))

            Return

        End Sub

End Class

Hinweise

Dieser Filter ist ein Satz boolescher Werte, der die Nachrichteneigenschaften einschränkt, die die MessageQueue Empfangen oder Vorschauen erhalten. Wenn die MessageQueue Nachricht von der Serverwarteschlange empfangen oder in einer Vorschau angezeigt wird, ruft sie nur die Eigenschaften ab, für die der MessageReadPropertyFilter Wert lautet true.

Im Folgenden werden die anfänglichen Eigenschaftswerte für die MessageReadPropertyFilter Eigenschaft angezeigt. Diese Einstellungen sind identisch mit dem Aufrufen SetDefaults eines MessagePropertyFilter.

In der folgenden Tabelle wird gezeigt, ob diese Eigenschaft in verschiedenen Arbeitsgruppenmodi verfügbar ist.

Weitere Informationen

• Peek()
• Receive()
• BeginPeek()
• BeginReceive()