最简单的方式更改xml字符串

Question

I'm getting a fetchXml from an external source and I need to insert an attribute into it. At this moment I'm doing a Q&D by replacing an attribute that surely resides there by itself together with the one I'd like to add.

String fetchy = ...;
String surely = "<attribute name=\"entity_uno_id\" />";
String addity = "<attribute name=\"entity_duo_id\" />";
return fetchy.Replace(surely, surely + addity);

This is ugly and not professional. Can I redesign it in a safer way? I have no control over the fetchXml being served to me.

Answer 1

Try something like this

 string xmlString = ... // the whole xml string;
    var xml = XElement.Parse(xmlString);
    var xElement = new XElement(XName.Get("attribute", null));
    xElement.SetAttributeValue(XName.Get("name", null), "entity_duo_id");
    xml.Add(xElement);

Answer 2

If you have control over the fetchXml that your receiving, have them format it in a String.Format ready type of formatting. For example, if your current string looks like this:

var xml = "<blah><attribute name='entity_uno_id' /></blah>"

change it to this:

var xml = "<blah><attribute name='entity_uno_id' />{0}</blah>"

then you can add whatever you want like this:

String fetchy = ...;
String addity = "<attribute name='entity_duo_id' />";
return String.Format(fetchy, addity);

EDIT 1

Assuming you still have control over the fetch xml given to include the {0} in the correct location of the xml, this extension method would work:

public static string AddAttributes(this string fetchXml, params string[] attributeNames)
{
    return String.Format(fetchXml, String.Join(String.Empty, attributeNames.Select(a => "<attribute name='" + a + "' />")));
}