class 参数     {         public void doSome(string str,params int[] values){             if (values != null && values.Length > 0)             {                 for (var i = 0; i < values.Length; i++)                 {                     Console.WriteLine(str + "," + values[i]);                 }             }             else {                 Console.WriteLine(str);             }         }         static void Main() {             参数 c = new 参数();             c.doSome("a");             c.doSome("b",1);             c.doSome("c",1,2,3);             int[] arr = { 1, 5, 7 };             c.doSome("d",arr);         }     }