[AWS]

My LINQ statement looks like

List<XElement> filteredset 
= (from file in matchingsets.Elements<XElement>(Global.xnFile) 
where (((string)file.Attribute(Global.xnToKeep).Value != "*")
&& ((string)file.Attribute(Global.xnProtected).Value != "*") &
& File.Exists(file.Attribute(Global.xnPath).Value)) 
select file).ToList<XElement>();

My problem is that neither file.Attribute(Global.xnToKeep). nor file.Attribute(Global.xnProtected) are guaranteed to exist in file.  So, I need to test their existence before testing what their value is.  How do I do that in a LINQ statement?


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