我要评论本文实例讲述了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
}
}
希望本文所述对大家的c#程序设计有所帮助。
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