OOP Class12

Interfaces Part2

There are many interfaces in the .net framework. Some that we have been working with are the [ICollection https://msdn.microsoft.com/en-us/library/system.collections.icollection(v=vs.110).aspx] [IList https://msdn.microsoft.com/en-us/library/system.collections.ilist(v=vs.110).aspx] and [IEnumerable https://msdn.microsoft.com/en-us/library/system.collections.ienumerable(v=vs.110).aspx]

These interfaces allow us to use methods in a List and Array.

Here is an example of sorting a list of ints or an int[] <csharp> int[] ints = new int[] { 5, 4, 2, 3, 1 };

           foreach (var number in ints)
           {
               Console.Write(string.Format("{0}\t", number));
           }
           Console.WriteLine();

           Array.Sort(ints);
           foreach (var number in ints)
           {
               Console.Write(string.Format("{0}\t", number));
           }
           Console.WriteLine();
           
           ints = ints.Reverse().ToArray();
           foreach (var number in ints)
           {
               Console.Write(string.Format("{0}\t", number));
           }
           Console.WriteLine();

                       //mess it up again
           ints = new int[] { 5, 4, 2, 3, 1 };

           ints = ints.OrderBy(i => i).ToArray();
           foreach (var number in ints)
           {
               Console.Write(string.Format("{0}\t", number));
           }
           Console.WriteLine();

           //mess it up again
           ints = new int[] { 5, 4, 2, 3, 1 };

           //last way slightly uses agregate function to Order array by int, turns array into list so we can call foreach
           ints.OrderBy(i => i).ToList().ForEach(ii=>Console.Write(string.Format("{0}\t", ii)));
           Console.WriteLine();

</csharp>

now with List <csharp> </csharp>