CommHelper

18位流水号：

        public static string GenerateTransId(int i)
        {
            string transId = DateTime.Now.ToString("yyyyMMddHHmmss");
            int l = i - 14;
            return transId + CreateRandCode(l);

        }

        public static string CreateRandCode(int codeLen)
        {
            string codeSerial = "1,2,3,4,5,6,7,a,c,d,e,f,h,i,j,k,m,n,p,r,s,t,A,C,D,E,F,G,H,J,K,M,N,P,Q,R,S,U,V,W,X,Y,Z";
            if (codeLen == 0)
            {
                codeLen = 16;
            }
            string[] arr = codeSerial.Split(',');
            string code = "";
            int randValue = -1;
            Random rand = new Random(unchecked((int)DateTime.Now.Ticks));
            for (int i = 0; i < codeLen; i++)
            {
                randValue = rand.Next(0, arr.Length - 1);
                code += arr[randValue];
            }
            return code;
        }