Console.writeLine();求解释

Question

        static void Main(string[] args)
        {
            double d = 0.234;
            Console.WriteLine("{0:#.00}", d);
            Console.ReadLine();
            //输出为.23 
        }
求解释 为什么不是0.23？

Answer 1

        
static void Main(string[] args)
        {
            double d = 1.234;
            Console.WriteLine("{0:0.#0}", d);
            Console.ReadLine();
            //输出为1.23 
        }这个字符“#”怎么用？

Answer 2

double d = 5.234;
Console.WriteLine("{0:0.00}", d);
Console.ReadLine();

Answer 3

 Console.WriteLine(d.ToString("#,##.00"));

Answer 4

或者用：
double d = 15.234;
Console.WriteLine("{0:F2}", d);
Console.ReadLine();

Answer 5

        static void Main(string[] args)
        {
            double d = 0.234;
            Console.WriteLine(d.ToString("#,##.00"));
            Console.ReadLine();
            //输出为.23 
        }