GetElementById

GetElementById

• RookieDBA

  This sample works using VS 2005:

  XmlDocument doc = new XmlDocument();
  doc.LoadXml(@"<!DOCTYPE foo [
      <!ELEMENT foo (item)*>
      <!ELEMENT item EMPTY>
      <!ATTLIST item id ID #REQUIRED>]>
      <foo>
          <item id='test'/>
          <item id='xyz'/
          <item id='abc'/> 
      </foo>");
  XmlElement e = doc.GetElementById("xyz");
  Console.WriteLine(e.OuterXml);
  
  The trick is that you have to have some attribute of type ID defined using a DTD.  If you have the following instead:
  
  

  < xml version="1.0" encoding="utf-16" >
  <xs:schema elementFormDefault="qualified"
                   xmlns:xs="    http://www.w3.org/2001/XMLSchema">
      <xs:element name="foo">
          <xs:complexType>
              <xs:sequence minOccurs="0" maxOccurs="unbounded">
                  <xs:element ref="item" />
              </xs:sequence>
          </xs:complexType>
      </xs:element>
      <xs:element name="item">
          <xs:complexType>
              <xs:attribute name="id" type="xs:ID" use="required" />
          </xs:complexType>
      </xs:element>
  </xs:schema>
  
  then it will not work and this is a known limitation.  You can file feature request on http://lab.msdn.microsoft.com/productfeedback/.

  
  
• GetElementById