Locating XML Elements by Attribute Value in .NET

I have an xml document that looks like this:

<?xml version="1.0" encoding="utf-8"standalone="yes"?>
<WorkItem TimeZone="Mountain Standard" Offset="-07:00:00">
 <RevisionFields>
  <Field ReferenceName="OriginalTestEstimate" Name="Estimated Test" Type="Double">
     <Value>5</Value>
  </Field>
  <Field ReferenceName="RemainingDevWork" Name="Remaining Dev" Type="Double">
     <Value>9</Value>
  </Field>
  <Field ReferenceName="RemainingTestWork" Name="Remaining Test" Type="Double">
     <Value>5</Value>
  </Field>
 ...

A TFS service that I am calling gives it to me as an XmlDocument object. I am trying to access the Value parts of the fields. I can use workItem["WorkItem"]["RevisionFields"] to get to the array of all the fields, but when I try to get at a specific field using this notation I get stuck.

Since the "Name" is set I tried using that (ie workItem["WorkItem"]["RevisionFields"]["Remaining Test"] but that just returns null.

What do I need to do so I can get directly at the values in the fields? (I woul开发者_如何学God prefer to not have to iterate all of the fields.)

You could use XPath to retrieve the node:

/WorkItem/RevisionFields/Field[@Name='Remaining Test']/Value

Look at the SelectSingleNode() method (and the SelectNodes() method).