Generating message with expressions

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    • #13140

      What can I do if I would like to create an empty message in Message Assignment? There are much documents on the Net about this subject, but I can’t use any of them.

      Usually the messages come form ports, or I can create them with Transform Shapes. But how can I create a message from program code?

      If I simply give a value to the message fileds, on build it says that I use an unconstructed message.

      If I use the
      msgEmpty=new System.Xml.XmlDocument();
      expression, I can deploy and run the orchestration, but I get a long error message about distinguished fileds, and that: I must initialize the message part data.

      If I give values to the elements, for example:
      msgEmpty.MessRow.First=\”There was an error\”;
      I get the same error message.

      If I use the
      code, I get an exception.

      I tried to read from an xml file in the Message Assignment, but it didn’t work.

      So, is there any way to create a new message from code?
      It should not be too difficult, but I don’t know the correct method to do this.

    • #13141


      The first way seems to be good for me. But I had to insert the namespace to the <root> element also. Without it, the pipeline can’t process the xml.

      Now, I will try to do it with a multi-part message also, but I think, it will work.

      • #13142

        There is no way of creating a blank Xml document that would suit all implementations. So when constructing an Xml message you have to build it yourself.

        When you create a new XmlDocument it is empty, it has no nodes .

        There are a number of ways of constructing a blank XmlDocument.
        1. Use an XmlDocument variable
        YouMessage = XmlDocVariable;[/code:1:6548ce32bb]

        2. Use a .NET serializable class
        [code:1:6548ce32bb]using System;
        using Microsoft.XLANGs.BaseTypes;

        namespace NetClass
        public class MsgClass
        public MsgClass()
        StrField = \"OK\";
        IntField = 1;

        public String StrField;

        public int IntField;
        The in a message assignment shape
        [code:1:6548ce32bb]message = new NetClass.MsgClass[/code:1:6548ce32bb]

        3. Use a .NET helper class
        namespace CreateMsgHelper

        public class Helper
        private static XmlDocument _template = null;
        private static object _sync = new object();
        private static String LOCATION = @\":\\MyTemplateLocation\\MyMsgTemplate.xml\";

        public static XmlDocument GetXmlDocumentTemplate()
        XmlDocument doc = _template;
        if (doc == null)
        // Load the doc template from disk.
        doc = new XmlDocument();
        XmlTextReader reader = new XmlTextReader(LOCATION);

        // Synchronize assignment to _template.
        lock (_sync)
        XmlDocument doc2 = _template;
        if (doc2 == null)
        _template = doc;
        // Another thread beat us to it.
        doc = doc2;

        // Need to explicitly create a clone so that we are not
        // referencing the same object statically held by this class.
        doc = (XmlDocument) doc.CloneNode(true);
        return doc;
        The in a message assignment shape
        [code:1:6548ce32bb]MsgOut = CreateMsgHelper.Helper.GetXmlDocumentTemplate();[/code:1:6548ce32bb]
        3.Use a map with a Transform shape.

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