一个自动生成类似的GUID（无重复保障）

 1 public string GetRandStr()
 2         {
 3             System.Text.StringBuilder newRandom = new System.Text.StringBuilder(20);
 4             Random rd = new Random();
 5             char[] dptSysID = { ‘0‘, ‘1‘, ‘2‘, ‘3‘, ‘4‘, ‘5‘, ‘6‘, ‘7‘, ‘8‘, ‘9‘, ‘a‘, ‘c‘, ‘d‘, ‘e‘, ‘A‘, ‘B‘, ‘C‘, ‘D‘, ‘E‘, ‘F‘ };
 6             for (int i = 0; i < 32; i++)
 7             {
 8                 newRandom.Append(dptSysID[rd.Next(20)]);
 9             }
10             string sysID = newRandom.ToString();
11             return sysID.Substring(0, 8).ToString() + "-"
12                  + sysID.Substring(8, 4).ToString() + "-"
13                  + sysID.Substring(12,4).ToString() + "-"
14                  + sysID.Substring(16,4).ToString() + "-"
15                  + sysID.Substring(20,12).ToString();
16         }