ado.net做验证码

piperzero

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经过这次的实训学到了不少东西，下面来讲讲我学到的做验证码

using System;
using System.Collections.Generic;
using System.Linq;
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;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;

public partial class validate : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)

{

this.CreateCheckCodeImage(GenerateCheckCode());

}

private string GenerateCheckCode()

{

int number;

char code;

string checkCode = String.Empty;

System.Random random = new Random();

for (int i = 0; i < 5; i++)

{

number = random.Next();

if (number % 2 == 0)

code = (char)('0' + (char)(number % 10));

else

code = (char)('a' + (char)(number % 26));

checkCode += code.ToString();

}

Response.Cookies.Add(new HttpCookie("CheckCode", checkCode));

Session["CheckCode"] = checkCode;

return checkCode;

}

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 * 12.5)), 30);

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", 16, (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, 2);

//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();

}

}

}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class UseCheckCode : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

}
protected void Unnamed1_Click(object sender, EventArgs e)
{
if (((string)Session["CheckCode"]) != txtTest.Text)
{
ErrorMsg_CheckCode.Text = "验证码错误！";
}
else
{
ErrorMsg_CheckCode.Text = "验证码正确！";
}

}
protected void Unnamed1_Click1(object sender, EventArgs e)
{
}
}

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="UseCheckCode.aspx.cs" Inherits="UseCheckCode" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

document.getElementById('vcodeimg').src = 'Checkcode.aspx?time=' + Math.random();
</script>
<asp:Button runat="server" Text="提交" Width="98px" Height="35px"
onclick="Unnamed1_Click"/>
<asp:TextBox ID="txtTest" runat="server"></asp:TextBox>
<asp:Label ID="ErrorMsg_CheckCode" runat="server" Text="Label"></asp:Label>
</div>
</form>
</body>
</html>

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