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By	Sonu Kapoor
First Posted	02/20/2005
Times viewed	1825

How to remove an attribute with XmlDocument and RemoveAll?

Summary How to remove an attribute with XmlDocument and RemoveAll?

The current section contains lot examples to edit, create or update XML elements or attributes. However you havent seen any example which will remove an attribute. In this example I will show you how you can remove an attribute. The key to remove the attribute is to use the RemoveAll() function from the XmlDocument class. It is important to understand how this function is to be used. If you call the function on a node which doesn't have an attribute then it will delete all child nodes. If the you can this funtion on a node which contains an attribute, it will only delete the attribute. Here is an example which illustrates the first scenario (the function is called over a node which does not have an attribute). In both examples I will use the same XML file.

Additional information
<%@ import namespace="System.Xml" %> <%@ page language="C#" debug="true"%> <script runat="server"> void page_load(object sender, System.EventArgs e){ // Create a XmlDocument object XmlDocument xmlDoc = new XmlDocument(); // Load the xml file into it. xmlDoc.Load(Server.MapPath("XmlDocumentWithRemoveAll.xml")); // Select the node which contains the attribute XmlNode node = xmlDoc.SelectSingleNode("/CategoryList/Category"); // check whether we found something if(node != null) { // Remove the child nodes node.RemoveAll(); // Dont forget to save the file. xmlDoc.Save(Server.MapPath("xmlDocumentWithRemoveAll.xml")); // Print out the result to the user. Response.Write(xmlDoc.OuterXml); } } </script> Here is the 2nd example which will only remove the attribute of the MainCategory node. I will use the same XML. All you need is the changed code. <%@ import namespace="System.Xml" %> <%@ page language="C#" debug="true"%> <script runat="server"> void page_load(object sender, System.EventArgs e){ // Create a XmlDocument object XmlDocument xmlDoc = new XmlDocument(); // Load the xml file into it. xmlDoc.Load(Server.MapPath("XmlDocumentWithRemoveAll.xml")); // Select the node which contains the attribute XmlNode node = xmlDoc.SelectSingleNode("CategoryList/Category/MainCategory[@ID='2'~"); // check whether we found something if(node != null) { // Remove the attribute node.RemoveAll(); // Dont forget to save the file. xmlDoc.Save(Server.MapPath("xmlDocumentWithRemoveAll.xml")); // Print out the result to the user. Response.Write(xmlDoc.OuterXml); } } </script>

Further additional information
In both examples I will use the same XML file. <?xml version="1.0" encoding="utf-8"?> <CategoryList> <Category> <MainCategory/> <Description>VC++ Articles</Description> <Active>Yes</Active> </Category> <Category> <MainCategory ID="1"/> <Description>XML Articles</Description> <Active>Yes</Active> </Category> <Category> <MainCategory ID="2"/> <Description>XSL Articles</Description> <Active>Yes</Active> </Category> <Category> <MainCategory ID="3"/> <Description>XPath Articles</Description> <Active>Yes</Active> </Category> <Category> <MainCategory ID="4"/> <Description>XQuery Articles</Description> <Active>Yes</Active> </Category> </CategoryList> And here is the XML file after executing the above code. As you can see it has removed all the subnodes of the first Category node. Output: <?xml version="1.0" encoding="utf-8"?> <CategoryList> <Category> </Category> <Category> <MainCategory ID="1" /> <Description>XML Articles</Description> <Active>Yes</Active> </Category> <Category> <MainCategory ID="2" /> <Description>XSL Articles</Description> <Active>Yes</Active> </Category> <Category> <MainCategory ID="3" /> <Description>XPath Articles</Description> <Active>Yes</Active> </Category> <Category> <MainCategory ID="4" /> <Description>XQuery Articles</Description> <Active>Yes</Active> </Category> </CategoryList> And here is the XML file after the code has removed only the attribute of the second MainCategory node. Output: <?xml version="1.0" encoding="utf-8"?> <CategoryList> <Category> <MainCategory /> <Description>VC++ Articles</Description> <Active>Yes</Active> </Category> <Category> <MainCategory ID="1" /> <Description>XML Articles</Description> <Active>Yes</Active> </Category> <Category> <MainCategory /> <Description>XSL Articles</Description> <Active>Yes</Active> </Category> <Category> <MainCategory ID="3" /> <Description>XPath Articles</Description> <Active>Yes</Active> </Category> <Category> <MainCategory ID="4" /> <Description>XQuery Articles</Description> <Active>Yes</Active> </Category> </CategoryList>

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