◆如何生成8位随机码◆

hs1983 2008-10-17 11:00:08
求一个由0-9的数字和A-Z的字母随意组合生成随机码的例子。谢谢!
...全文
288 7 打赏 收藏 转发到动态 举报
AI 作业
写回复
用AI写文章
7 条回复
切换为时间正序
请发表友善的回复…
发表回复
蝶恋花雨 2008-10-17
  • 打赏
  • 举报
回复
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

using System.Drawing.Imaging;
using System.Drawing;
using System.IO;
public partial class include_ValidateCode : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
string tmp = RndNum(5).ToUpper();
this.Session["ImageV"] = tmp;
HttpCookie a = new HttpCookie("ImageV", tmp);
Response.Cookies.Add(a);
this.CreateCheckCodeImage(tmp);
}
#region//创建验证码
private void ValidateCode(string VNum)
{
Bitmap Img = null;
Graphics g = null;
MemoryStream ms = null;

int gheight = VNum.Length * 10;
Img = new Bitmap(gheight, 25);
g = Graphics.FromImage(Img);
//背景颜色
g.Clear(Color.White);
//文字字体
Font f = new Font("Arial Black", 10);
//文字颜色
SolidBrush s = new SolidBrush(Color.Black);
g.DrawString(VNum, f, s, 3, 3);
ms = new MemoryStream();
Img.Save(ms, ImageFormat.Jpeg);
Response.ClearContent();
Response.ContentType = "image/Jpeg";
Response.BinaryWrite(ms.ToArray());

g.Dispose();
Img.Dispose();
Response.End();
}
#endregion
#region//生验证码随即数字+字母组合
private string RndNum(int VcodeNum)
{
string Vchar = "a,b,c,d,e,0,1,2,3,4,5,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,0,1,2,3,4,5,6,7,8,9,w,x,y,z,a,b,c,d,e,f,g,h,i,j,k,l,m,1,2,3,4,5,6,7,8,9,n,o,p,q,r,s,t,u,v,w,x,y,z";
string[] VcArray = Vchar.Split(new Char[] { ',' });
string VNum = "";
int temp = -1;

Random rand = new Random();

for (int i = 1; i < VcodeNum + 1; i++)
{
if (temp != -1)
{
rand = new Random(i * temp * unchecked((int)DateTime.Now.Ticks));
}

int t = rand.Next(35);
if (temp != -1 && temp == t)
{
return RndNum(VcodeNum);
}
temp = t;
VNum += VcArray[t];
}
return VNum;
}
#endregion
#region //创建验证码背景图片
private void CreateCheckCodeImage(string checkCode)
{
if (checkCode == null || checkCode.Trim() == String.Empty)
return;

System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 13.0)), 21);
Graphics g = Graphics.FromImage(image);

try
{
//生成随机生成器

Random random = new Random();

//清空图片背景色

g.Clear(Color.White);

//画图片的背景噪音线

for (int i = 0; i < 25; i++)
{
int x1 = random.Next(image.Width);
int x2 = random.Next(image.Width);
int y1 = random.Next(image.Height);
int y2 = random.Next(image.Height);

g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
}

Font font = new System.Drawing.Font("Arial", 12, (System.Drawing.FontStyle.Bold | System.Drawing.FontStyle.Italic));
System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2f, true);
g.DrawString(checkCode, font, brush, 2, 1);

//画图片的前景噪音点

for (int i = 0; i < 100; i++)
{
int x = random.Next(image.Width);
int y = random.Next(image.Height);

image.SetPixel(x, y, Color.FromArgb(random.Next()));
}

//画图片的边框线

g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);

System.IO.MemoryStream ms = new System.IO.MemoryStream();
image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
Response.ClearContent();
Response.ContentType = "image/Gif";
Response.BinaryWrite(ms.ToArray());
}
finally
{
g.Dispose();
image.Dispose();
}
}
#endregion
}

这个是生成5位的。生成8位的自己改改
Eagle_ice 2008-10-17
  • 打赏
  • 举报
回复
[Quote=引用 4 楼 devilli 的回复:]
string[] chars = {"0", "1", ..."Z"};
DateTime dt = new DateTime();
dt = DateTime.Now;
Random rnd = new Random(dt.Millisecond);
string rndNumber = "";
for (int i=0; i <8; i++)
{
rndNumber += chars[rnd.Next(chars.Length)];
}
[/Quote]
正解...
蝶恋花雨 2008-10-17
  • 打赏
  • 举报
回复
#region//生验证码随即数字+字母组合
private string RndNum(int VcodeNum)
{
string Vchar = "a,b,c,d,e,0,1,2,3,4,5,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,0,1,2,3,4,5,6,7,8,9,w,x,y,z,a,b,c,d,e,f,g,h,i,j,k,l,m,1,2,3,4,5,6,7,8,9,n,o,p,q,r,s,t,u,v,w,x,y,z";
string[] VcArray = Vchar.Split(new Char[] { ',' });
string VNum = "";
int temp = -1;

Random rand = new Random();

for (int i = 1; i < VcodeNum + 1; i++)
{
if (temp != -1)
{
rand = new Random(i * temp * unchecked((int)DateTime.Now.Ticks));
}

int t = rand.Next(35);
if (temp != -1 && temp == t)
{
return RndNum(VcodeNum);
}
temp = t;
VNum += VcArray[t];
}
return VNum;
}
#endregion
devilli 2008-10-17
  • 打赏
  • 举报
回复
string[] chars = {"0", "1", ..."Z"};
DateTime dt = new DateTime();
dt = DateTime.Now;
Random rnd = new Random(dt.Millisecond);
string rndNumber = "";
for (int i=0; i<8; i++)
{
rndNumber += chars[rnd.Next(chars.Length)];
}
solomon_jie 2008-10-17
  • 打赏
  • 举报
回复
首先建一个由0-9,A-Z组成的字符数组。
然后以当前时间为随机数种子进行选择
pongid2353345 2008-10-17
  • 打赏
  • 举报
回复
//获得x位随机字符串
public static string GetRandomString(int length)
{
string str="q,w,e,r,t,y,u,i,o,p,a,s,d,f,g,h,j,k,l,m,n,b,v,c,x,z,1,2,3,4,5,6,7,8,9,0";

string [] s=str.Split(",".ToCharArray());

string t="";

Random rm = new Random();

for (int i=0;i<length;i++)
{
t += s[rm.Next(0, 35)];
}

return t;
}
cpio 2008-10-17
  • 打赏
  • 举报
回复
定义一个数组

string[] chars = {"0", "1", ..."Z"};

string rndNumber = "";
for (int i=0; i<8; i++)
{
rndNumber += chars[(new Random).Next(chars.Length)];
}

111,095

社区成员

发帖
与我相关
我的任务
社区描述
.NET技术 C#
社区管理员
  • C#
  • AIGC Browser
  • by_封爱
加入社区
  • 近7日
  • 近30日
  • 至今
社区公告

让您成为最强悍的C#开发者

试试用AI创作助手写篇文章吧