MessageQueue.Send Method

Definition

Namespace:

System.Messaging

Assembly:

System.Messaging.dll

Sends an object to a queue.

Overloads

Send(Object)	Sends an object to non-transactional queue referenced by this MessageQueue.
Send(Object, MessageQueueTransaction)	Sends an object to the transactional queue referenced by this MessageQueue.
Send(Object, MessageQueueTransactionType)	Sends an object to the queue referenced by this MessageQueue.
Send(Object, String)	Sends an object to the non-transactional queue referenced by this MessageQueue and specifies a label for the message.
Send(Object, String, MessageQueueTransaction)	Sends an object to the transactional queue referenced by this MessageQueue and specifies a label for the message.
Send(Object, String, MessageQueueTransactionType)	Sends an object to the queue referenced by this MessageQueue and specifies a label for the message.

Send(Object)

Sends an object to non-transactional queue referenced by this MessageQueue.

public:
 void Send(System::Object ^ obj);

public void Send (object obj);

member this.Send : obj -> unit

Public Sub Send (obj As Object)

Parameters

obj

Object

The object to send to the queue.

Exceptions

MessageQueueException

The Path property has not been set.

-or-

An error occurred when accessing a Message Queuing method.

Examples

The following code example connects to a message queue and sends a message to the queue.

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

using namespace System;
using namespace System::Messaging;
ref class MyNewQueue
{
public:
   void SendMessage()
   {
      
      // Connect to a queue on the local computer.
      MessageQueue^ myQueue = gcnew MessageQueue( ".\\myQueue" );
      
      // Send a message to the queue.
      if ( myQueue->Transactional == true )
      {
         
         // Create a transaction.
         MessageQueueTransaction^ myTransaction = gcnew MessageQueueTransaction;
         
         // Begin the transaction.
         myTransaction->Begin();
         
         // Send the message.
         myQueue->Send( "My Message Data.", myTransaction );
         
         // Commit the transaction.
         myTransaction->Commit();
      }
      else
      {
         myQueue->Send( "My Message Data." );
      }

      return;
   }

};

int main()
{
   
   // Create a new instance of the class.
   MyNewQueue^ myNewQueue = gcnew MyNewQueue;
   
   // Send a message to a queue.
   myNewQueue->SendMessage();
   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 sends a message to a queue.
        //**************************************************

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

            // Send a message to a queue.
            myNewQueue.SendMessage();

            return;
        }

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

            // Send a message to the queue.
            if (myQueue.Transactional == true)
            {
                // Create a transaction.
                MessageQueueTransaction myTransaction = new
                    MessageQueueTransaction();

                // Begin the transaction.
                myTransaction.Begin();

                // Send the message.
                myQueue.Send("My Message Data.", myTransaction);

                // Commit the transaction.
                myTransaction.Commit();
            }
            else
            {
                myQueue.Send("My Message Data.");
            }

            return;
        }
    }
}

Imports System.Messaging

Public Class MyNewQueue


        '
        ' Provides an entry point into the application.
        ' 
        ' This example sends a message to a queue.
        '

        Public Shared Sub Main()

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

            ' Send a message to a queue.
            myNewQueue.SendMessage()

            Return

        End Sub


        '
        ' Sends a message to a queue.
        '

        Public Sub SendMessage()

            ' Connect to a queue on the local computer.
            Dim myQueue As New MessageQueue(".\myQueue")

            ' Send a message to the queue.
            If myQueue.Transactional = True Then

                ' Create a transaction.
                Dim myTransaction As New MessageQueueTransaction

                ' Begin the transaction.
                myTransaction.Begin()

                ' Send the message.
                myQueue.Send("My Message Data.", myTransaction)

                ' Commit the transaction.
                myTransaction.Commit()

            Else
                myQueue.Send("My Message Data.")
            End If

            Return

        End Sub

End Class

The following code example sends an application-defined Order class to a queue and then receives a message from that queue.

Remarks

Use this overload to send a message that contains the obj parameter to the queue referenced by the MessageQueue. The object you send to the queue can be a Message or any managed object. If you send any object other than a Message, the object is serialized and inserted into the body of the message.

If you use this overload to send a message to a transactional queue, the message will be sent to the dead-letter queue. If you want the message to be part of a transaction that contains other messages, use an overload that takes a MessageQueueTransaction or MessageQueueTransactionType as a parameter.

If you do not set the Formatter property before calling Send(Object), the formatter defaults to the XmlMessageFormatter.

The DefaultPropertiesToSend property applies to any object other than a Message. If you specify, for example, a label or a priority using the DefaultPropertiesToSend member, these values apply to any message that contains an object that is not of type Message when your application sends it to the queue. When sending a Message, the property values set for the Message take precedence over DefaultPropertiesToSend and the message's Message.Formatter property takes precedence over the queue's MessageQueue.Formatter property.

The following table shows whether this method is available in various Workgroup modes.

Workgroup mode	Available
Local computer	Yes
Local computer and direct format name	Yes
Remote computer	No
Remote computer and direct format name	Yes

See also

• DefaultPropertiesToSend
• Message
• Path
• Peek()
• Receive()
• BeginPeek()
• BeginReceive()

Send(Object, MessageQueueTransaction)

Sends an object to the transactional queue referenced by this MessageQueue.

public:
 void Send(System::Object ^ obj, System::Messaging::MessageQueueTransaction ^ transaction);

public void Send (object obj, System.Messaging.MessageQueueTransaction transaction);

member this.Send : obj * System.Messaging.MessageQueueTransaction -> unit

Public Sub Send (obj As Object, transaction As MessageQueueTransaction)

Parameters

obj

Object

The object to send to the queue.

transaction

MessageQueueTransaction

The MessageQueueTransaction object.

Exceptions

ArgumentNullException

The transaction parameter is null.

MessageQueueException

The Path property has not been set.

-or-

The Message Queuing application indicated an incorrect transaction use.

-or-

An error occurred when accessing a Message Queuing method.

Examples

The following code example sends a string to a transactional queue and then receives a message from that queue.

#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
{
public:

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

      // Send a message to the queue.
      if ( myQueue->Transactional == true )
      {
         // Create a transaction.
         MessageQueueTransaction^ myTransaction = gcnew MessageQueueTransaction;

         // Begin the transaction.
         myTransaction->Begin();

         // Send the message.
         myQueue->Send( "My Message Data.", myTransaction );

         // Commit the transaction.
         myTransaction->Commit();
      }

      return;
   }


   //*************************************************
   // Receives a message containing an Order.
   //*************************************************
   void ReceiveMessageTransactional()
   {
      // Connect to a transactional queue on the local computer.
      MessageQueue^ myQueue = gcnew MessageQueue( ".\\myTransactionalQueue" );

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

      // Create a transaction.
      MessageQueueTransaction^ myTransaction = gcnew MessageQueueTransaction;
      try
      {
         // Begin the transaction.
         myTransaction->Begin();

         // Receive the message. 
         Message^ myMessage = myQueue->Receive( myTransaction );
         String^ myOrder = static_cast<String^>(myMessage->Body);

         // Display message information.
         Console::WriteLine( myOrder );

         // Commit the transaction.
         myTransaction->Commit();
      }
      catch ( MessageQueueException^ e ) 
      {
         // Handle nontransactional queues.
         if ( e->MessageQueueErrorCode == MessageQueueErrorCode::TransactionUsage )
         {
            Console::WriteLine( "Queue is not transactional." );
         }

         // Else catch other sources of MessageQueueException.
         // Roll back the transaction.
         myTransaction->Abort();
      }

      // Catch other exceptions as necessary, such as 
      // InvalidOperationException, thrown when the formatter 
      // cannot deserialize the message.
      return;
   }
};

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

   // Send a message to a queue.
   myNewQueue->SendMessageTransactional();

   // Receive a message from a queue.
   myNewQueue->ReceiveMessageTransactional();
   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 sends and receives a message from
        // a transactional queue.
        //**************************************************

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

            // Send a message to a queue.
            myNewQueue.SendMessageTransactional();

            // Receive a message from a queue.
            myNewQueue.ReceiveMessageTransactional();
        
            return;
        }

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

            // Send a message to the queue.
            if (myQueue.Transactional == true)
            {
                // Create a transaction.
                MessageQueueTransaction myTransaction = new
                    MessageQueueTransaction();

                // Begin the transaction.
                myTransaction.Begin();

                // Send the message.
                myQueue.Send("My Message Data.", myTransaction);

                // Commit the transaction.
                myTransaction.Commit();
            }

            return;
        }

        //**************************************************
        // Receives a message containing an Order.
        //**************************************************
        
        public  void ReceiveMessageTransactional()
        {
            // Connect to a transactional queue on the local computer.
            MessageQueue myQueue = new
                MessageQueue(".\\myTransactionalQueue");

            // Set the formatter.
            myQueue.Formatter = new XmlMessageFormatter(new Type[]
                {typeof(String)});
            
            // Create a transaction.
            MessageQueueTransaction myTransaction = new
                MessageQueueTransaction();

            try
            {
                // Begin the transaction.
                myTransaction.Begin();
                
                // Receive the message.
                Message myMessage =	myQueue.Receive(myTransaction);
                String myOrder = (String)myMessage.Body;

                // Display message information.
                Console.WriteLine(myOrder);

                // Commit the transaction.
                myTransaction.Commit();
            }
            
            catch (MessageQueueException e)
            {
                // Handle nontransactional queues.
                if (e.MessageQueueErrorCode ==
                    MessageQueueErrorCode.TransactionUsage)
                {
                    Console.WriteLine("Queue is not transactional.");
                }
                
                // Else catch other sources of MessageQueueException.

                // Roll back the transaction.
                myTransaction.Abort();
            }

            // Catch other exceptions as necessary, such as
            // InvalidOperationException, thrown when the formatter
            // cannot deserialize the message.

            return;
        }
    }
}

Imports System.Messaging

   
Public Class MyNewQueue


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

        Public Shared Sub Main()

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

            ' Send a message to a queue.
            myNewQueue.SendMessageTransactional()

            ' Receive a message from a queue.
            myNewQueue.ReceiveMessageTransactional()

            Return

        End Sub


        '
        ' Sends a message to a queue.
        '

        Public Sub SendMessageTransactional()

            ' Connect to a queue on the local computer.
            Dim myQueue As New MessageQueue(".\myTransactionalQueue")

            ' Send a message to the queue.
            If myQueue.Transactional = True Then
                ' Create a transaction.
                Dim myTransaction As New MessageQueueTransaction

                ' Begin the transaction.
                myTransaction.Begin()

                ' Send the message.
                myQueue.Send("My Message Data.", myTransaction)

                ' Commit the transaction.
                myTransaction.Commit()
            End If

            Return

        End Sub


        '
        ' Receives a message containing an Order.
        '

        Public Sub ReceiveMessageTransactional()

            ' Connect to a transactional queue on the local computer.
            Dim myQueue As New MessageQueue(".\myTransactionalQueue")

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

            ' Create a transaction.
            Dim myTransaction As New MessageQueueTransaction

            Try

                ' Begin the transaction.
                myTransaction.Begin()

                ' Receive the message. 
                Dim myMessage As Message = _
                    myQueue.Receive(myTransaction)
                Dim myOrder As [String] = CType(myMessage.Body, _
                    [String])

                ' Display message information.
                Console.WriteLine(myOrder)

                ' Commit the transaction.
                myTransaction.Commit()


            Catch e As MessageQueueException

                ' Handle nontransactional queues.
                If e.MessageQueueErrorCode = _
                    MessageQueueErrorCode.TransactionUsage Then

                    Console.WriteLine("Queue is not transactional.")

                End If

                ' Else catch other sources of a MessageQueueException.


                ' Roll back the transaction.
                myTransaction.Abort()


                ' Catch other exceptions as necessary, such as 
                ' InvalidOperationException, thrown when the formatter
                ' cannot deserialize the message.

            End Try

            Return

        End Sub

End Class

Remarks

Use this overload to send a message that contains the obj parameter to the transactional queue referenced by the MessageQueue, using an internal transaction context defined by the transaction parameter. The object you send to the queue can be a Message or any managed object. If you send any object other than a Message, the object is serialized and inserted into the body of the message.

If you use this overload to send a message to a non-transactional queue, the message might be sent to the dead-letter queue without throwing an exception.

If you do not set the Formatter property before calling Send(Object), the formatter defaults to the XmlMessageFormatter.

The DefaultPropertiesToSend property applies to any object other than a Message. If you specify, for example, a label or a priority using the DefaultPropertiesToSend member, these values apply to any message that contains an object that is not of type Message when your application sends it to the queue. When sending a Message, the property values set for the Message take precedence over DefaultPropertiesToSend and the message's Message.Formatter property takes precedence over the queue's MessageQueue.Formatter property.

MessageQueueTransaction is threading apartment aware, so if your apartment state is STA, you cannot use the transaction in multiple threads. Visual Basic sets the state of the main thread to STA, so you must apply the MTAThreadAttribute in the Main subroutine. Otherwise, sending a transactional message using another thread throws a MessageQueueException exception. You apply the MTAThreadAttribute by using the following fragment.

<System.MTAThreadAttribute>
 public sub Main()

The following table shows whether this method is available in various Workgroup modes.

Workgroup mode	Available
Local computer	Yes
Local computer and direct format name	Yes
Remote computer	No
Remote computer and direct format name	Yes

See also

• DefaultPropertiesToSend
• Message
• MessageQueueTransaction
• Transactional
• Peek()
• Receive()
• BeginPeek()
• BeginReceive()

Send(Object, MessageQueueTransactionType)

Sends an object to the queue referenced by this MessageQueue.

public:
 void Send(System::Object ^ obj, System::Messaging::MessageQueueTransactionType transactionType);

public void Send (object obj, System.Messaging.MessageQueueTransactionType transactionType);

member this.Send : obj * System.Messaging.MessageQueueTransactionType -> unit

Public Sub Send (obj As Object, transactionType As MessageQueueTransactionType)

Parameters

obj

Object

The object to send to the queue.

transactionType

MessageQueueTransactionType

One of the MessageQueueTransactionType values, describing the type of transaction context to associate with the message.

Exceptions

InvalidEnumArgumentException

The transactionType parameter is not one of the MessageQueueTransactionType members.

MessageQueueException

The Path property has not been set.

-or-

An error occurred when accessing a Message Queuing method.

Examples

The following code example demonstrates the use of Send(Object, MessageQueueTransactionType).

// Connect to a transactional queue on the local computer.
MessageQueue^ queue = gcnew MessageQueue(".\\exampleTransQueue");

// Create a new message.
Message^ msg = gcnew Message("Example Message Body");

// Send the message.
queue->Send(msg, MessageQueueTransactionType::Single);

queue->Close();

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

// Create a new message.
Message msg = new Message("Example Message Body");

// Send the message.
queue.Send(msg, MessageQueueTransactionType.Single);

Remarks

Use this overload to send a message that contains the obj parameter to the queue referenced by the MessageQueue, using a transaction context defined by the transactionType parameter. Specify Automatic for the transactionType parameter if there is already an external transaction context attached to the thread that you want to use to send the message. Specify Single if you want to send the message as a single internal transaction. You can specify None if you want to send a transactional message to a non-transactional thread.

The object you send to the queue can be a Message or any managed object. If you send any object other than a Message, the object is serialized and inserted into the body of the message.

If you do not set the Formatter property before calling Send(Object), the formatter defaults to the XmlMessageFormatter.

The DefaultPropertiesToSend property applies to any object other than a Message. If you specify, for example, a label or a priority using the DefaultPropertiesToSend member, these values apply to any message that contains an object that is not of type Message when your application sends it to the queue. When sending a Message, the property values set for the Message take precedence over DefaultPropertiesToSend and the message's Message.Formatter property takes precedence over the queue's MessageQueue.Formatter property.

The following table shows whether this method is available in various Workgroup modes.

Workgroup mode	Available
Local computer	Yes
Local computer and direct format name	Yes
Remote computer	No
Remote computer and direct format name	Yes

See also

• MessageQueueTransactionType
• DefaultPropertiesToSend
• Message
• Transactional
• Peek()
• Receive()
• BeginPeek()
• BeginReceive()

Send(Object, String)

Sends an object to the non-transactional queue referenced by this MessageQueue and specifies a label for the message.

public:
 void Send(System::Object ^ obj, System::String ^ label);

public void Send (object obj, string label);

member this.Send : obj * string -> unit

Public Sub Send (obj As Object, label As String)

Parameters

obj

Object

The object to send to the queue.

label

String

The label of the message.

Exceptions

ArgumentNullException

The label parameter is null.

MessageQueueException

The Path property has not been set.

-or-

An error occurred when accessing a Message Queuing method.

Examples

The following code example demonstrates the use of Send(Object, String).

// Connect to a queue on the local computer.
MessageQueue^ queue = gcnew MessageQueue(".\\exampleQueue");

// Create a new message.
Message^ msg = gcnew Message("Example Message Body");

// Send the message.
queue->Send(msg, "Example Message Label");

queue->Close();

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

// Create a new message.
Message msg = new Message("Example Message Body");

// Send the message.
queue.Send(msg, "Example Message Label");

Remarks

Use this overload to send a message that contains the obj parameter to the queue referenced by the MessageQueue. With this overload, you can specify the string label that identifies the message. The object you send to the queue can be a Message, a structure, a data object, or any managed object. If you send any object other than a Message, the object is serialized and inserted into the body of the message.

The message label is distinct from the message queue label, but both are application-dependent and have no inherit meaning to Message Queuing.

If you use this overload to send a message to a transactional queue, the message will be sent to the dead-letter queue. If you want the message to be part of a transaction that contains other messages, use an overload that takes a MessageQueueTransaction or MessageQueueTransactionType as a parameter.

The Path property for this MessageQueue instance must be specified before you send the message. If you do not set the Formatter property before calling Send(Object), the formatter defaults to the XmlMessageFormatter.

The DefaultPropertiesToSend property applies to any object other than a Message. If you specify, for example, a label or a priority using the DefaultPropertiesToSend member, these values apply to any message that contains an object that is not of type Message when your application sends it to the queue. When sending a Message, the property values set for the Message take precedence over DefaultPropertiesToSend and the message's Message.Formatter property takes precedence over the queue's MessageQueue.Formatter property.

The following table shows whether this method is available in various Workgroup modes.

Workgroup mode	Available
Local computer	Yes
Local computer and direct format name	Yes
Remote computer	No
Remote computer and direct format name	Yes

See also

• DefaultPropertiesToSend
• Message
• Label
• Peek()
• Receive()
• BeginPeek()
• BeginReceive()

Send(Object, String, MessageQueueTransaction)

Sends an object to the transactional queue referenced by this MessageQueue and specifies a label for the message.

public:
 void Send(System::Object ^ obj, System::String ^ label, System::Messaging::MessageQueueTransaction ^ transaction);

public void Send (object obj, string label, System.Messaging.MessageQueueTransaction transaction);

member this.Send : obj * string * System.Messaging.MessageQueueTransaction -> unit

Public Sub Send (obj As Object, label As String, transaction As MessageQueueTransaction)

Parameters

obj

Object

The object to send to the queue.

label

String

The label of the message.

transaction

MessageQueueTransaction

The MessageQueueTransaction object.

Exceptions

ArgumentNullException

The label parameter is null.

-or-

The transaction parameter is null.

MessageQueueException

The Path property has not been set.

-or-

The Message Queuing application indicated an incorrect transaction usage.

-or-

An error occurred when accessing a Message Queuing method.

Examples

The following code example demonstrates the use of Send(Object, String, MessageQueueTransaction).

// Connect to a transactional queue on the local computer.
MessageQueue^ queue = gcnew MessageQueue(".\\exampleTransQueue");

// Create a new message.
Message^ msg = gcnew Message("Example Message Body");

// Create a message queuing transaction.
MessageQueueTransaction^ transaction = gcnew MessageQueueTransaction();

try
{
    // Begin a transaction.
    transaction->Begin();

    // Send the message to the queue.
    queue->Send(msg, "Example Message Label", transaction);

    // Commit the transaction.
    transaction->Commit();
}
catch (Exception^ ex)
{
    // Cancel the transaction.
    transaction->Abort();

    // Propagate the exception.
    throw ex;
}
finally
{
    // Dispose of the transaction object.
    delete transaction;
    queue->Close();
}

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

// Create a new message.
Message msg = new Message("Example Message Body");

// Create a message queuing transaction.
MessageQueueTransaction transaction = new MessageQueueTransaction();

try
{
    // Begin a transaction.
    transaction.Begin();

    // Send the message to the queue.
    queue.Send(msg, "Example Message Label", transaction);

    // Commit the transaction.
    transaction.Commit();
}
catch(System.Exception e)
{
    // Cancel the transaction.
    transaction.Abort();

    // Propagate the exception.
    throw e;
}
finally
{
    // Dispose of the transaction object.
    transaction.Dispose();
}

Remarks

Use this overload to send a message that contains the obj parameter to the transactional queue referenced by the MessageQueue, using an internal transaction context defined by the transaction parameter. With this overload, you can specify the string label that identifies the message. The object you send to the queue can be a Message, a structure, a data object, or any managed object. If you send any object other than a Message, the object is serialized and inserted into the body of the message.

The message label is distinct from the message queue label, but both are application-dependent and have no inherit meaning to Message Queuing.

If you use this overload to send a message to a non-transactional queue, the message might be sent to the dead-letter queue without throwing an exception.

If you do not set the Formatter property before calling Send(Object), the formatter defaults to the XmlMessageFormatter.

The DefaultPropertiesToSend property applies to any object other than a Message. If you specify, for example, a label or a priority using the DefaultPropertiesToSend member, these values apply to any message that contains an object that is not of type Message when your application sends it to the queue. When sending a Message, the property values set for the Message take precedence over DefaultPropertiesToSend and the message's Message.Formatter property takes precedence over the queue's MessageQueue.Formatter property

MessageQueueTransaction is threading apartment aware, so if your apartment state is STA, you cannot use the transaction in multiple threads. Visual Basic sets the state of the main thread to STA, so you must apply the MTAThreadAttribute in the Main subroutine. Otherwise, sending a transactional message using another thread throws a MessageQueueException exception. You apply the MTAThreadAttribute by using the following fragment.

<System.MTAThreadAttribute>
 public sub Main()

The following table shows whether this method is available in various Workgroup modes.

Workgroup mode	Available
Local computer	Yes
Local computer and direct format name	Yes
Remote computer	No
Remote computer and direct format name	Yes

See also

• DefaultPropertiesToSend
• Message
• MessageQueueTransaction
• Transactional
• Label
• Peek()
• Receive()
• BeginPeek()
• BeginReceive()

Send(Object, String, MessageQueueTransactionType)

Sends an object to the queue referenced by this MessageQueue and specifies a label for the message.

public:
 void Send(System::Object ^ obj, System::String ^ label, System::Messaging::MessageQueueTransactionType transactionType);

public void Send (object obj, string label, System.Messaging.MessageQueueTransactionType transactionType);

member this.Send : obj * string * System.Messaging.MessageQueueTransactionType -> unit

Public Sub Send (obj As Object, label As String, transactionType As MessageQueueTransactionType)

Parameters

obj

Object

The object to send to the queue.

label

String

The label of the message.

transactionType

MessageQueueTransactionType

One of the MessageQueueTransactionType values, describing the type of transaction context to associate with the message.

Exceptions

ArgumentNullException

The label parameter is null.

MessageQueueTransaction

The Message Queuing application indicated an incorrect transaction usage.

InvalidEnumArgumentException

The transactionType parameter is not one of the MessageQueueTransactionType members.

MessageQueueException

The Path property has not been set.

-or-

An error occurred when accessing a Message Queuing method.

Examples

The following code example demonstrates the use of Send(Object, String, MessageQueueTransactionType).

// Connect to a transactional queue on the local computer.
MessageQueue^ queue = gcnew MessageQueue(".\\exampleTransQueue");

// Create a new message.
Message^ msg = gcnew Message("Example Message Body");

// Send the message.
queue->Send(msg, "Example Message Label",
    MessageQueueTransactionType::Single);

queue->Close();

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

// Create a new message.
Message msg = new Message("Example Message Body");

// Send the message.
queue.Send(msg, "Example Message Label",
    MessageQueueTransactionType.Single);

Remarks

Use this overload to send a message that contains the obj parameter to the queue referenced by the MessageQueue, using a transaction context defined by the transactionType parameter. Specify Automatic for the transactionType parameter if there is already an external transaction context attached to the thread that you want to use to send the message. Specify Single if you want to send the message as a single internal transaction. You can specify None if you want to send a transactional message to a non-transactional thread.

The object you send to the queue can be a Message or any managed object. If you send any object other than a Message, the object is serialized and inserted into the body of the message. With this overload, you can specify the string label that identifies the message.

The message label is distinct from the message queue label, but both are application-dependent and have no inherit meaning to Message Queuing.

If you do not set the Formatter property before calling Send(Object), the formatter defaults to the XmlMessageFormatter.

The DefaultPropertiesToSend property applies to any object other than a Message. If you specify, for example, a label or a priority using the DefaultPropertiesToSend member, these values apply to any message that contains an object that is not of type Message when your application sends it to the queue. When sending a Message, the property values set for the Message take precedence over DefaultPropertiesToSend, and the message's Message.Formatter property takes precedence over the queue's MessageQueue.Formatter property.

The following table shows whether this method is available in various Workgroup modes.

Workgroup mode	Available
Local computer	Yes
Local computer and direct format name	Yes
Remote computer	No
Remote computer and direct format name	Yes

See also

• MessageQueueTransactionType
• DefaultPropertiesToSend
• Message
• Transactional
• Label
• Peek()
• Receive()
• BeginPeek()
• BeginReceive()