Question

Why would the Count property be an explicit interface implementation in System.Array?

    string[] a = new string[0];
    int countAsArray = a.Count; // compile error
    int countAsIList = ((ICollection<string>)a).Count; // success

http://msdn.microsoft.com/en-us/library/bb357392.aspx

Answer 1

Probably because the more common means of determining the number of items in an Array is the Length property. Having both Count and Length would be a tad confusing.