'Where' clause in LINQ To XML not selecting anything

c#, linq-to-xml, xml

Solution

You're calling `XAttribute.ToString()`. Try using `XAttribute.Value` instead, or just cast to a string. `ToString()` will return `value="C:\\Logs\\File.log"` - the name and the value - whereas you just want the value:

var elements = from el in node.Elements("param")
               where (string) el.Attribute("value") == "C:\\Logs\\File.log"
               select el;

Personally I wouldn't bother with a query expression here, btw:

var elements = node.Elements("param")
         .Where(el => (string) el.Attribute("value") == "C:\\Logs\\File.log")

EDIT: Additionally, as others have said, you want to have single backslashes in the XML file.

Problem

I am just trying to read some details from an XML file, part of which looks like this: ``` <appender name="FILE" class="applications.core.logging.CustomFileAppender"> <param name="File" value="C:\\Logs\\File.log"/> <param name="MaxBackupIndex" value="5"/> </appender> <appender name="FILE" class="applications.core.logging.CustomFileAppender"> <param name="File" value="C:\\Logs\\File2.log"/> <param name="MaxBackupIndex" value="17"/> </appender> <appender name="FILE" class="applications.core.logging.CustomFileAppender"> <param name="File" value="C:\\Logs\\File3.log"/> <param name="MaxBackupIndex" value="98"/> </appender> ``` I have several of these 'appender' nodes in my XML file. The following code loops through each 'appender' node. Within each 'appender' I want to pick out the param node with name "File" and check if the value is equal to what I am looking for. ``` foreach (XElement node in XmlFile.Descendants("appender")) { IEnumerable<XElement> elements = from el in node.Elements("param") where el.Attribute("value").ToString().Equals("C:\\Logs\\File.log")) select el; foreach (XElement el in elements) { Console.WriteLine("Found it " + el.Name); // Now read value for MaxBackupIndex } } ``` However my code is not printing anything out, so I think possibly the 'where' part of my LINQ query is incorrect, can anybody spot where I am going wrong?

Original source