feige 通过本文主要向大家介绍了c#随机生成字符串,c#随机数字字符串,c#随机字符串,c#字符串类,c#字符串截取等相关知识,希望对您有所帮助,也希望大家支持linkedu.com www.linkedu.com
本文实例讲述了C#生成不重复随机字符串类。分享给大家供大家参考。具体如下：
这个C#类用于随机产生不重复的字符串，可以指定字符串范围，可以指定要产生字符串的长度
using System;
namespace DotNet.Utilities
{
public class RandomOperate
{
// 一：随机生成不重复数字字符串
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;
}
//方法二：随机生成字符串（数字和字母混和）
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>
/// 从字符串里随机得到，规定个数的字符串.
/// </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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希望本文所述对大家的C#程序设计有所帮助。
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