C#生成指定长度随机数

 public static string GetRandomString(int iLength)
 {
     string buffer = "";// 随机字符中也可以为汉字（任何）
     StringBuilder sb = new StringBuilder();
     Random r = new Random();
     int range = buffer.Length;
     for (int i = ; i < iLength; i++)
     {
         sb.Append(buffer.Substring(r.Next(range),));
     }
     return sb.ToString();
 }

借鉴原文：https://blog.csdn.net/sds15732622190/article/details/51426527