Example C# code fragment for use with .NET

A C# code fragment demonstrating that an application connects to a queue manager, puts a message on to a queue and receives a reply.

The following C# code fragment demonstrates an application that performs three actions:
  1. Connect to a queue manager
  2. Put a message onto SYSTEM.DEFAULT.LOCAL.QUEUE
  3. Get the message back
It also shows how to change the connection type.

// ===========================================================================
// Licensed Materials - Property of IBM
// 5724-H72
// (c) Copyright IBM Corp. 2003, 2021
// ===========================================================================
using System;
using System.Collections;

using IBM.WMQ;

class MQSample
{
  // The type of connection to use, this can be:-
  // MQC.TRANSPORT_MQSERIES_BINDINGS for a server connection.
  // MQC.TRANSPORT_MQSERIES_CLIENT for a non-XA client connection
  // MQC.TRANSPORT_MQSERIES_XACLIENT for an XA client connection
  // MQC.TRANSPORT_MQSERIES_MANAGED for a managed client connection
  const String connectionType = MQC.TRANSPORT_MQSERIES_CLIENT;

  // Define the name of the queue manager to use (applies to all connections)
  const String qManager = "your_Q_manager";

  // Define the name of your host connection (applies to client connections only)
  const String hostName = "your_hostname";

  // Define the name of the channel to use (applies to client connections only)
  const String channel = "your_channelname";



  /// <summary>
  /// Initialise the connection properties for the connection type requested
  /// </summary>
  /// <param name="connectionType">One of the MQC.TRANSPORT_MQSERIES_ values</param>
  static Hashtable init(String connectionType)
  {
    Hashtable connectionProperties = new Hashtable();

    // Add the connection type
    connectionProperties.Add(MQC.TRANSPORT_PROPERTY, connectionType);

    // Set up the rest of the connection properties, based on the
    // connection type requested
    switch(connectionType)
    {
      case MQC.TRANSPORT_MQSERIES_BINDINGS:
        break;
      case MQC.TRANSPORT_MQSERIES_CLIENT:
      case MQC.TRANSPORT_MQSERIES_XACLIENT:
      case MQC.TRANSPORT_MQSERIES_MANAGED:
        connectionProperties.Add(MQC.HOST_NAME_PROPERTY, hostName);
        connectionProperties.Add(MQC.CHANNEL_PROPERTY, channel);
        break;
    }

    return connectionProperties;
  }
  /// <summary>
  /// The main entry point for the application.
  /// </summary>
  [STAThread]
  static int Main(string[] args)
  {
    try
    {
      Hashtable connectionProperties = init(connectionType);

      // Create a connection to the queue manager using the connection
      // properties just defined
      MQQueueManager qMgr = new MQQueueManager(qManager, connectionProperties);

      // Set up the options on the queue we want to open
      int openOptions = MQC.MQOO_INPUT_AS_Q_DEF | MQC.MQOO_OUTPUT;

      // Now specify the queue that we want to open,and the open options
      MQQueue system_default_local_queue =
        qMgr.AccessQueue("SYSTEM.DEFAULT.LOCAL.QUEUE", openOptions);

      // Define an IBM MQ message, writing some text in UTF format
      MQMessage hello_world = new MQMessage();
      hello_world.WriteUTF("Hello World!");

      // Specify the message options
      MQPutMessageOptions pmo = new MQPutMessageOptions(); // accept the defaults,
                                                           // same as MQPMO_DEFAULT

      // Put the message on the queue
      system_default_local_queue.Put(hello_world, pmo);



      // Get the message back again

      // First define an IBM MQ message buffer to receive the message
      MQMessage retrievedMessage =new MQMessage();
      retrievedMessage.MessageId =hello_world.MessageId;

      // Set the get message options
      MQGetMessageOptions gmo =new MQGetMessageOptions(); //accept the defaults
                                                          //same as MQGMO_DEFAULT

      // Get the message off the queue
      system_default_local_queue.Get(retrievedMessage,gmo);

      // Prove we have the message by displaying the UTF message text
      String msgText = retrievedMessage.ReadUTF();
      Console.WriteLine("The message is: {0}", msgText);

      // Close the queue
      system_default_local_queue.Close();

      // Disconnect from the queue manager
      qMgr.Disconnect();
    }

    //If an error has occurred,try to identify what went wrong.

    //Was it an IBM MQ error?
    catch (MQException ex)
    {
      Console.WriteLine("An IBM MQ error occurred: {0}", ex.ToString());
    }

    catch (System.Exception ex)
    {
      Console.WriteLine("A System error occurred: {0}", ex.ToString());
    }

    return 0;
  }//end of start
}//end of sample