Question

I have a solution folder in which I have collect all the .dll’s and store in a array list. I have to search all the sub-directories. How to write the LINQ Query?

var r = dir.GetFiles("*.dll")
           .Where<FileInfo>(i => i.Name.StartsWith("SAMPLE"))
           .ToList();

Is this Correct? For example i 20 dll’s startwith name “SAMPLE”

Answer 1

I would recommend you using the EnumerateFiles method:

var r = Directory
    .EnumerateFiles(@"c:\work", "*.dll", SearchOption.AllDirectories)
    .Where(file => file.StartsWith("SAMPLE"))
    .ToList();

or even better use the wildcard pattern to filter instead of filtering in-memory:

var r = Directory
    .EnumerateFiles(@"c:\work", "SAMPLE*.dll", SearchOption.AllDirectories)
    .ToList();