Linq equivalent of for-each

If you've ever wondered about using Linq for a more elegant implementation of a for each loop then this may be useful, use the Select<> method to perform actions against a set of items, as long as you return a value of any sort then you can perform any action during the selection.

In the example below I need to remove all folders that were written to over an hour ago, it also returns info on the folders processed and whether they were successfully removed:

if (string.IsNullOrEmpty(RootWorkingFolder) || !Directory.Exists(RootWorkingFolder)) return;

Directory.GetDirectories(RootWorkingFolder)
   .Where(f => Directory.GetLastWriteTime(f) < DateTime.Now.AddHours(-1))
   .Select(delegate(string f)
   {
      try
      {
         Directory.Delete(f, true);
         return new {Folder = f, Removed = true};
      }
      catch (IOException)
      {
         return new {Folder = f, Removed = false};
      }
   }).ToList();

The ToList method is to ensure that the query is executed immediately.

Pretty useful to know :-)