How to filter files from directory using LINQ?

Question

In my program c#, i am using LINQ to fetch all file from directory for processing as following

var FilesToProcess = from filePath in Directory.GetFiles(sDire         


        

Answer 1

You can use the Linq GroupBy method to do this, eg:

DirectoryInfo directory = new DirectoryInfo(sDirectory);
var filePairs = directory
            .GetFiles("*.xml")
            .Union(directory.GetFiles("*.txt"))
            .GroupBy(file => file.Name);

Or if you wish to get just the files in pairs:

var filePairs = directory
            .GetFiles("*.xml")
            .Union(directory.GetFiles("*.txt"))
            .GroupBy(file => file.Name)
            .Select(grp => new
            {
                 XmlFile = grp.FirstOrDefault(file => file.Extension == "xml"),
                 TxtFile = grp.FirstOrDefault(file => file.Extension == "txt")
            })
            .Where(pair => pair.XmlFile != null && pair.TxtFile!= null);