public string ConverNo(string str) { string result = ""; char[] chars = new char[7]; for (int i = 0; i < chars.Length; i++) chars[i] = '0'; char[] chars1 = str.ToArray(); //字符串生成数组 string str0 = "0000000"; result = str0.Substring(0,str0.Length-str.Length); result = result += str; return ""; }