C# 取二位小数点(四舍五入)

            double d = 0.12545678;             Console.WriteLine(d);             Console.WriteLine(d.ToString("F2"));    //0.13             Console.WriteLine(d.ToString("N2"));    //0.13             Console.Read();

            double dd = 99999990.12545678;             Console.WriteLine(dd);             Console.WriteLine(dd.ToString("F3"));    //99999990.125             Console.WriteLine(dd.ToString("N3"));    //99,999,990.125             Console.Read();

F,不会带，号 N，会带，号

F或N后面的数字就是小数位。

    Console.WriteLine(String.Format("{0:F2}", 200.215555)); //200.22