执行的时候显示输入字符串格式不正确，有没有人看一下

Question

namespace 第N天
{
internal class Program
{

    public Program()
    {
        Console.WriteLine("请输入十个数字并用逗号分隔");
        

        String shu = Convert.ToString(Console.ReadLine());


        string[] ss = shu.Split(',');

        for (int i = 0; i < shu.Length-1; i++)
        {
            int shu1 = i;
            for (int j = i + 1; j < shu.Length-1-i ; i++)
            {
                if (shu[shu1] > shu[j])
                {
                    shu1 = shu[j];
                }
            }
        }
        for (int i = 0; i < shu.Length; i++)
        {
            Console.WriteLine("运用for循环排序{} ", shu[i]);
        }
        Console.ReadKey();
    }

     
    
    static void Main(string[] args)
    {
    Program pro = new Program();
    }
}

}

Answer 1

运用for循环排序{0}