InfoPath Dev

I have been trying to resolve a problem for several days now. 

I have built a few custom controls for InfoPath following the article “Creating an InfoPath Custom Control using C# and .NET” at  http://blogs.msdn.com/infopath/archive/2005/04/15/408728.aspx .

I modified the schema form the article above and assigned it the following attributes xmlns:n1”urn:us:um:uc:v3.0”  and assigned it the target namespace “urn:us:um:uc:v3.0”.  The schema is valid in both Spy and InfoPath.

I keep getting an error “Reference to an undeclared namespace prefix ‘n1’”  when passing the XPath string "./n1:street” into domNode.selectSingleNode(“./n1:street”);  However, when I pass in the equivalent XPath string “./*1”  the controls works as expected. 

When I invoke the xDocument.UI.Alert(domNode.xml) or xDocument.UI.Alert(domNode.prefix), InfoPath displays both the correct XML structure and prefix when the domNode is displayed so the prefix is correct.

I have researched the problem in great detail and cannot seem to find a reasonable solution.  I have tried some of the suggestions many of which stated to set the SelectionNamespaces but I don’t see that available with the imported assemblies given in the example above. 

Can someone enlighten me as to the problem with this?  Below is code snippet 

private void HandleChangesInUI(object sender, EventArgs e)

      {           TextBox senderTbx = (TextBox)sender;

                  this.ChangeDOM("./n1:street", this.streetTbx.Text);

                  }

      private void ChangeDOM(string xPath, string value)

      {     if (domNode != null)

            {

            Microsoft.Office.Interop.InfoPath.Xml.IXMLDOMNode singleNode = domNode.selectSingleNode(xPath);

                  if (singleNode.text != value)

                  {

                        singleNode.text = value;

                  }

            } 

      }    

It seems like SelectionNamespaces is exactly what you need. It is set as a property on the document. From your code it's not clear as to where domNode is defined.

You can do the following before calling your selects:

domNode.ownerDocument.setProperty("SelectionNamespaces", "xmlns:n1=\"ht7p://something\"");

Of course it's best to this only once as the document will retain this setting. However, no harm is done if you do it many times. Note that you can define several prefixes this way if you space-separate them.

Good luck!

David

 Thanks for replying.

 I am setting referencing/instatiating the domNode within the Init method  using MicroSoft.Office.Interop.InfoPath.InfoPathControlSite  Node Property.

 per web article  http://blogs.msdn.com/infopath/archive/2006/12/18/creating-complex-infopath-controls-in-c-sharp.aspx.

 Here is the code setting  domNode which references InfoPath's InfoPathControlSite 

#region InfoPathControl Members
    public void Enable(bool vfEnabled)
    {
    }

    private XDocumentClass xDocument = null;
    public void Init(InfoPathControlSite pControlSite)
    {
        this.domNode = pControlSite.Node;
        this.xDocument = (XDocumentClass)pControlSite.XDocument;
     

   this.RestoreState();
    }

 
    }
    #endregion

I have tried using xDocument.SetNamedNodeProperty(domNode, "SelectionNamespaces", xmlns:n1="urn:......"");

 I have also tried passing in domNode,ownerDocument into xDocument.SetNamedNodeProperty(domNode, "SelectionNamespaces", xmlns:n1="urn:......"") since I don't see a setProperty() for within  MicroSoft.Office.Interop.InfoPath.InfoPathControlSite .

If anyone can lead me out of this pit, it would be greatly appreciated.

 Thanks

JB

Well, that's strange, you should be able to just do this in your init right after you assign domNode:

this.domNode.ownerDocument.setProperty("SelectionNamespaces", "xmlns:n1=\"urn\"");

Is domNode's type IXMLDOMNode? If not, cast it to this type.

David,

 I keep forgetting to post a reply I finally came up with the appropriate code to allow me to set the namespace properties in C#. 

I used the following code to set the namespace properties...

MSXML2.IXMLDOMDocument2 domDocument2 =  (MSXML2.IXMLDOMDocument2) this.domNode.getOwner;

domDocument2.setProperty("SelectionNamespaces", "xmlns:n1=\"urn\"");

 Thanks for the help

Jim

Great, I'm glad you finally got the solution!