InfoPath Dev

I'm trying to take data I have streamed from an XML source, acquired through C# code from web service not available in soap, and place that data into a node set to be used in a drop-down. I've been able to get the data from the xml and into a string array. Now I'm stuck and don't know how to get it from the array to a node set.

I think the way to do this is to create an XML file with the same format as the XML you're retrieving, then import that as an XML file secondary data source and use that as the source for your dropdown.

Then when you call your web service, just copy the XML you receive into that data source and replace its contents.  No need to convert it into an array first.

 And just FYI, InfoPath 2010 has built-in functionality for querying REST web services, if that's what you're using.

I'm using Infopath 2007, do you have any sample code (C#) I can use to import the XML as a data source?

Creating a data source doesn't require code.  You just create a file with the XML you want, and go through the data source connection wizard.

In your code, you would need to use this.DataSources["dataSourceName"].CreateNavigator() to create an XPathNavigator, and you would use this to swap out its contents with the result of your web service call.  I'm afraid I don't have any code samples for this.