i++和++i的区别

class Program
    {
        static void Main(string[] args)
        {
            int x = 0;
            int y = 0;
            int i = 2;
            int j = 3;
            x = i++;
            Console.WriteLine("x={0},i={1}",x,i);

            y = ++j;
            Console.WriteLine("y={0},j={1}", y, j);

            Console.ReadKey();
        }
    }