ASPNET验证码生成器
验证码生成器:
调用页Default.aspx
<
body
>
<form id="form1" runat="server">
<div>
<asp:TextBox ID="TextBox1" runat="server">asp:TextBox>
<asp:Image ID="Image1" runat="server" ImageUrl="~/check.aspx" />
<br />
<asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" />
<br />
<asp:Label ID="Label1" runat="server" Text="Label">asp:Label>
div>
form>
body
>
html
>
Default.aspx.cs
文件
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;
public
partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
if (Page.Session.Contents["CheckCode"].ToString().ToLower() != this.TextBox1.Text.ToLower())
{
this.Label1.Text = "
错误"
;
}
else
{
this.Label1.Text = "
正确"
;
}
}
}
Check.aspx
页面为默认内容
Check.aspx.cs
文件,生成验证证图片
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;
public
partial class check : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
this.CreateCheckCodeImage(GenerateCheckCode(8,false));
}
private string GenerateCheckCode(int codeCount, bool isSaveCookies)
{
int number;
char code;
string checkCode = String.Empty;
System.Random randdom = new Random();
for (int i = 0; i < codeCount; i++)
{
number = randdom.Next();
if (number % 2 == 0)
code = (char)('0'+(char)(number%10));
else
code=(char)('A'+(char)(number%26));
checkCode += code.ToString();
}
if (isSaveCookies)
{
Response.Cookies.Add(new HttpCookie("CheckCode", checkCode));
}
else
{
Page.Session.Contents["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)),22);
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(image);
try
{
Random random = new Random();
g.Clear(System.Drawing.Color.White);
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 System.Drawing.Pen(System.Drawing.Color.Silver), x1, y1, x2, y2);
}
System.Drawing.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 System.Drawing.Rectangle(0, 0, image.Width, image.Height), System.Drawing.Color.Blue, System.Drawing.Color.DarkRed, 1.2f, true);
g.DrawString(checkCode, font, brush, 2, 2);
for (int i = 0; i < 100; i++)
{
int x = random.Next(image.Width);
int y = random.Next(image.Height);
image.SetPixel(x, y, System.Drawing.Color.FromArgb(random.Next()));
}
g.DrawRectangle(new System.Drawing.Pen(System.Drawing.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();
}
}
}