Friday, January 11, 2013

InfoPath: Managed code (C#) to convert view to Html

I've been looking for code snippets to be able to convert an Infopath view to Html and then use a converter service to create a PDf document. The form is published via InfoPath Forms Services so the export to PDF function is not available.

Inspired by the snippets I've found, I ended up with a nice piece of lean and mean code:

public void CreatePDF_Clicked(object sender, ClickedEventArgs e)
{
 // Create HTML.
 try
 {
  string sourceFileName = null;
  byte[] sourceFile = null;
  
  XPathNavigator root = MainDataSource.CreateNavigator();
  string myViewName = this.CurrentView.ViewInfo.Name;
  string myViewXslFile = myViewName + ".xsl";

  XslCompiledTransform transform = new XslCompiledTransform();
  transform.Load(ExtractFromPackage(myViewXslFile));
  
  // Generate a temporary HTML file
  string fileName = Guid.NewGuid().ToString() + ".htm";
  string filePath = Path.Combine(Path.GetTempPath(), fileName);
      
  using (XmlWriter writer = XmlWriter.Create(filePath))
  {
   // Convert the XML to HTML
   transform.Transform(root, writer);
   // writer.Close();
  }

  // Specify the HTML to convert
  sourceFile = File.ReadAllBytes(filePath);
 
  //** etc...
 
 }
 catch
 {
 }
}  
    
public XmlDocument ExtractFromPackage(string fileName)
{
 try
 {
  XmlDocument doc = new XmlDocument();

  using (Stream stream = Template.OpenFileFromPackage(fileName))
   doc.Load(stream);

  return doc;
 }
 catch (Exception ex)
 {
  throw new Exception(string.Format("Error extracting '{0}': {1}",
   fileName, ex.Message), ex);
 }
}

Hereby assuming that the name of the (current) view is equal to the name of the .xsl file in the XSN package.


How to convert Html to PDF:

3 comments:

  1. There is nothing lean about that code... and especially don't do Writer.Close() inside a using statement!

    ReplyDelete
    Replies
    1. Thanks John for your feedback.
      Without the Writer.Close() it's more lean than it was ;-)

      Delete
  2. This works great for me. All except one field. It is a multi-line textbox. If I copy the inner xml from "root" and paste into a xml file in VS2012, the field shows no line breaks (\n). But is I get the value of that field via the XPath, it has the breaks in it. I have spent a pretty good amount of time trying to set the XmlWriterSettings, but now I think it might be the XPathNavigator. I need the line breaks and I am running short of ideas. Any suggestions?

    ReplyDelete