C # generates non-repeating random string classes

This example describes C # generation of non-repeating random string classes. Share to everyone for your reference. Specific as follows:

This C # class is used to randomly generate non-repeating strings, you can specify a range of strings, you can specify the length of the string to be generated

Using System;namespace dotnet.utilities{public class Randomoperate {//One: randomly generates a non-repeating numeric string private int rep = 0; public string generatecheckcodenum (int codecount) {string str = string.      Empty;      Long num2 = DateTime.Now.Ticks + this.rep;      this.rep++; Random random = new Random (((int) (((ULONG) num2) & 0xffffffffL) |      (int) (num2 >> this.rep)); for (int i = 0; i < Codecount; i++) {int num = random.        Next (); str = str + ((char) (0x30 + ((ushort) (num% 10))).      ToString ();    } return str; }//Method Two: randomly generated strings (mixed numbers and letters) public string generatecheckcode (int codecount) {string str = string.      Empty;      Long num2 = DateTime.Now.Ticks + this.rep;      this.rep++; Random random = new Random (((int) (((ULONG) num2) & 0xffffffffL) |      (int) (num2 >> this.rep));        for (int i = 0; i < Codecount; i++) {char ch; int num = random.        Next (); if (num% 2) = = 0) {ch = (cHAR) (0x30 + ((ushort) (num% 10));        } else {ch = (char) (0x41 + ((ushort) (num% 0x1a)); } str = str + ch.      ToString ();    } return str;    } #region///<summary>///The string of the specified number from the string.     </summary>//<param name= "Allchar" ></param>//<param name= "Codecount" ></param> <returns></returns> private String Getrandomcode (string allchar, int codecount) {//string      Allchar = "1,2,3,4,5,6,7,8,9,a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z";      string[] Allchararray = Allchar.split (', ');      String randomcode = "";      int temp =-1;      Random rand = new Random (); for (int i = 0; i < Codecount; i++) {if (temp! =-1) {rand = new Random (temp * i * (int)        DateTime.Now.Ticks)); } int t = rand.        Next (allchararray.length-1); while (temp = = t) {t = rand. Next (Allchararray.length-1);        } temp = t;      Randomcode + = allchararray[t];    } return Randomcode; } #endregion}}

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C # generates non-repeating random string classes

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C # generates non-repeating random string classes