How to use LINQ to return substring of FileInfo.Name

Question

I would like to convert the below \"foreach\" statement to a LINQ query that returns a substring of the file name into a list:

IList fileNameSu         


        

Answer 1

If you happen to know the type of the collection of FileInfos, and it's a List, I'd probably skip the Linq and write:

        files.ConvertAll(
            file => file.Name.Substring(0, file.Name.Length - (file.Name.Length - file.Name.IndexOf(".config.xml")))
            );

or if it's an array:

        Array.ConvertAll(
            files,
            file => file.Name.Substring(0, file.Name.Length - (file.Name.Length - file.Name.IndexOf(".config.xml")))
            );

Mainly because I like saying "Convert" instead of "Select" to express my intent to a programmer reading this code.

However, Linq is part of C# now, so I think it's perfectly reasonable to insist that a reading programmer understand what Select does. And the Linq approach lets you easily migrate to PLinq in the future.