Question

I would like to do something like

Action<FileInfo> deleter = f =>
    {
        if (....) // delete condition here
        {
            System.IO.File.Delete(f.FullName);
        }
    };

DirectoryInfo di = new DirectoryInfo(_path);

di.GetFiles("*.pdf").Select(deleter); // <= Does not compile!
di.GetFiles("*.txt").Select(deleter); // <= Does not compile!
di.GetFiles("*.dat").Select(deleter); // <= Does not compile!

in order to delete old files from a directory. But I do not know how to directly apply the delegate to the FilInfo[] without an explicit foreach (the idea listed above does not work of course).

Is it possible?

Answer 1

Select() is used to project items from TSource to TResult. In your case, you do not need Select because you’re not projecting. Instead, use List<T>s ForEach method to delete files:

di.GetFiles("*.pdf").ToList().ForEach(deleter);