【C#】字符串补位

        static void Main(string[] args)
        {
            int i=9;
            Console.WriteLine(i.ToString("00000"));
            Console.WriteLine(i.ToString("D5"));
            Console.WriteLine(i.ToString().PadLeft(5));
            Console.WriteLine(i.ToString().PadLeft(5, '0'));
            Console.WriteLine(i.ToString().PadRight(5));
            Console.WriteLine(i.ToString().PadRight(5,'0'));
            Console.WriteLine();
        }