c# 3.0 - Session 2 (Implicitly typed varibles)

Session Overview 2 (Implicitly typed variables)

Local Type Inference (aka Implicitly Typed Local variables)
var keyword
Emphasis on local, as in local scope.


NOTE: var cannot be used in the following cases

As a return value from function
Uninitialized variables
Null assignment

using System;
using System.Collections.Generic;
using System.Linq;

public class csharp3_2
{
    public static void RunSnippet()
    {
        var num = 1;
        Console.WriteLine("Typeof num is {0}", num.GetType());
        var name = "rajesh";
        Console.WriteLine("Typeof name  is {0}", num.GetType());
        string[] countries = new string[] { "India", "US", "Israel", "China"};
        var iCountries = from c in countries
                         where c.StartsWith("I")
                         select c;
        foreach(var c in iCountries)
            Console.WriteLine(" Country starting with I {0}", c);
    }


    #region Helper methods
    public static void Main()
    {
        try
        {
            RunSnippet();
        }
        catch (Exception e)
        {
            string error = string.Format
                                   ("---\nThe following error occurred while executing

                                    the snippet:\n{0}\n---", e.ToString());
            Console.WriteLine(error);
        }
        finally
        {
            Console.Write("Press any key to continue...");
            Console.ReadKey();
        }
    }

      private static void Break()
      {
        System.Diagnostics.Debugger.Break();
      } 

    #endregion
}