DirectoryInfo Enumeration

Question

While learning C# basics i have learned that foreach works on those collection that have implemented IEnumerable interface. So far so good but today when I have came across DirectoryInfo I got confused.

If DirectoryInfo doesn't implement IEnumerable, then how does it come that foreach works?

DirectoryInfo[] dirListing = new DirectoryInfo(@"F:\eBook").GetDirectories();

foreach (DirectoryInfo dir in dirListing)
{
    Console.WriteLine(dir.Name);
}

Please tell me.......

Answer 1

You are using an array.

All arrays derive from the Array abstract class that does implement IEnumerable.

From Arrays (C# Programming Guide) on MSDN:

Array types are reference types derived from the abstract base type Array. Since this type implements IEnumerable and IEnumerable<T>, you can use foreach iteration on all arrays in C#.