In-depth introduction to InfoPath-operate the InfoPath Element

Principle: InfoPath forms are used as templates to define the formats and resources of xml data files in items. Therefore, manipulating InfoPath data is equivalent to operating xml data files.

1. Query InfoPath form elements
2. Add InfoPath form elements

First, let's look at the example of using XPath for queries in common XML.

1. Delete InfoPath form elements

Here we take the complex Repeating Table as an example.

The following code uses a button to traverse and search for rows with an empty field in the Repeating Table and delete a row (for details about multiple rows, see ).

 public void btnDeleteBlankRS_Clicked(object sender, ClickedEventArgs e)
  {
//Create an XmlNamespaceManager for ease of referencing namespaces
   XmlNamespaceManager ns = this.NamespaceManager;

//Create an XPathNavigator object for the main data source
   XPathNavigator xnMain = this.MainDataSource.CreateNavigator();

//Create an XPathNodeIterator object for the repeating table so we can loop thru all the rows in the repeating table
   XPathNodeIterator xiRepeatingTable = xnMain.Select("/my:myFields/my:gpRepeatingTable/my:gpRepeatingTableRow", ns);

//Loop thru all repeating table rows
   while (xiRepeatingTable.MoveNext())
   {
//Create an XPathNodeIterator object for the repeating section nodes within the repeating table
    XPathNodeIterator xiRepeatingSection = xiRepeatingTable.Current.Select("my:gpRepeatingSection/my:gpRepeatingSectionRow", ns);

//Loop thru the repeating sections within the current repeating table row
    while (xiRepeatingSection.MoveNext())
    {
//Create an XPathNavigator object for one of the fields within the Repeating Section
//NOTE: You may need to check more than one field to determine if the repeating section should be removed
     XPathNavigator xnRepeatingSectionField = xiRepeatingSection.Current.SelectSingleNode("my:field3", ns);

//See if the field in the repeating section is empty
     if (xnRepeatingSectionField.Value == string.Empty)
     {
//If so, delete the current repeating section
      xiRepeatingSection.Current.DeleteSelf();
     }
    }
   }
  }

 

 string name = "User2";   
string game = "Cube";   
            XmlNode node = doc.SelectSingleNode(String.Format("/players/player[name='{0}' and game='{1}']", name, game));   
            node.ParentNode.RemoveChild(node);  

Or

 String aaa = "/players/player[name='"+user+"' and game='"+game+"']";  
XmlNode node = docc.SelectSingleNode(aaa);