Question

I have Xml which looks like this:

<DataMapper xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <SqlTable />
  <Level_01s>
    <DataParameter>
      <SqlTable>MY-Table-Name</SqlTable>
      <Children>
        <DataParameter>
          <SqlTable>MY-Table-Name</SqlTable>
          <Children>
            <DataParameter>
              <SqlTable>MY-Table-Name</SqlTable>
              <Children>
                <DataParameter>
                  <SqlTable>[All]</SqlTable>
                  <Children />
                </DataParameter>
                <DataParameter>
                  <SqlTable>MY-Table-Name</SqlTable>
                  <Children>
                    <DataParameter>
                      <SqlTable>[All]</SqlTable>
                      <Children />
                    </DataParameter>
                  </Children>
                </DataParameter>
              </Children>
            </DataParameter>
          </Children>
        </DataParameter>
      </Children>
    </DataParameter>
  </Level_01s>
</ DataMapper>

What I’d like to do is update all instances of the element. The issue that I have is that the DataParameters may go n-levels deep.

How can I recursivly ensure I update all of these?

I am using this code to update Root-level elements:

XDocument xdoc = XDocument.Parse(myxmlstring);
var element = xdoc.Elements("SqlTable").Single();
element.Value = "foo";        
xdoc.Save("file.xml");

via Best way to change the value of an element in C#

Answer 1

If you use Descendants(“SqlTable”) instead of Elements(“SqlTable”).Single() it will get you all of the “SQLTable” elements in the entire document. Then you can just foreach through them and update the elements.

var elements = xdoc.Descendants("SqlTable");

foreach (var sqlTable in elements)
{
    sqlTable.Value = "foo";
}  

Or if you want to be terse you can do it all in LINQ syntax

Updated based on comment, Added .Where with predicate to build the list as an example of using a condition.

xdoc.Descendants("SqlTable").Where(s => s.Value != "All").ToList().ForEach(p => p.Value = "foo");