创建随机字符串

1/**//// <summary>
 2        /// 创建随机字符串
 3        /// </summary>
 4        /// <param name="codeCount">随机数的位数</param>
 5        /// <returns></returns>
 6        public static string CreateRandomCode_Len54(int codeCount) 
 7        { 
 8            string allChar = "1,A,2,S,3,D,4,F,5,G,6,H,7,J,8,K,9,L,8,M,7,N,6,B,5,V,4,C,3,X,2,Z,1,P,9,Q,8,Z,7,W,6,I,5,E,4,U,3,R,2,Y,1,T,E,X,G,Q"; 
 9            string[] allCharArray = allChar.Split(','); 
10            string randomCode = ""; 
11            int temp = -1; 
12
13            Random rand = new Random(); 
14            for(int i = 0; i < codeCount; i++) 
15            { 
16                if(temp != -1) 
17                { 
18                    rand = new Random(i*temp*((int)DateTime.Now.Ticks)); 
19                } 
20                int t = rand.Next(54); 
21                if(temp == t) 
22                { 
23                    return CreateRandomCode_Len54(codeCount); 
24                } 
25                temp = t; 
26                randomCode += allCharArray[t]; 
27            } 
28            return randomCode; 
29        }