Login 图片验证码， 用一个aspx页面作为图片验证码
第二种是：比较简单，生成的不是图片，是span和文字版的验证码
1、类库文件
<ccid_code>using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web.UI;
using System.ComponentModel;
using System.Web.UI.WebControls;
using System.Drawing;
using System.Web;
using System.IO;
namespace MyControls
{
[ParseChildren(false)]
[DefaultProperty("Text")]
[ToolboxData("<{0}:ValidateControl runat=server></{0}:ValidateControl>")]
public class ValidateControl : WebControl
{
public ValidateControl() : base(HtmlTextWriterTag.Img)
{ }
#region 属性
[Category("Appearance"),
PersistenceMode(PersistenceMode.InnerDefaultProperty),
Bindable(true), DefaultValue("GBK5"),
Localizable(true), Description("Label_Text")]
public virtual string Text
{
get
{
String s = (String)ViewState["Text"];
return ((s == null) ? "GK4W" : s);
}
set
{
ViewState["Text"] = value;
}
}
[BrowsableAttribute(true)]
[DescriptionAttribute("背景图片")]
[CategoryAttribute("Appearance")]
public virtual String ImageUrl
{
get { return ViewState["ImageUrl"] != null ? (string)ViewState["ImageUrl"] : ""; }
set { ViewState["ImageUrl"] = value; }
}
[BrowsableAttribute(true)]
[DescriptionAttribute("数据位数")]
[CategoryAttribute("Appearance")]
public virtual int Step
{
get { return ViewState["Step"] != null ? (int)ViewState["Step"] : 4; }
set { ViewState["Step"] = value; }
}
[BrowsableAttribute(true)]
[DescriptionAttribute("文本位置")]
[CategoryAttribute("Appearance")]
public virtual TextAlign TextAlign
{
get { return ViewState["TextAlign"] != null ?
(TextAlign)ViewState["TextAlign"] :
DX.GO.Portal.Web.Controls.TextAlign.center; }
set { ViewState["TextAlign"] = value; }
}
protected override HtmlTextWriterTag TagKey
{
get
{
return HtmlTextWriterTag.Span;
}
}
#endregion
#region 初始化
protected override void OnLoad(EventArgs e)
{
Text = GenerateCheckCode(Step);
//CreateCheckCodeImage(Text);
base.OnLoad(e);
}
#endregion
#region 内部方法
/// <summary>
/// 产生随机字符串
/// </summary>
/// <param name="num">int</param>
/// <returns>string</returns>
private string GenerateCheckCode(int num)
{
#region
//string[] source ={"0","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 code = "";
//Random rd = new Random();
//for (int i = 0; i < num; i++)
//{
// code += source[rd.Next(0, source.Length)];
//}
//return code;
#endregion
int number;
char code;
string checkCode = String.Empty;
Random random = new Random();
for (int i = 0; i < num; i++)
{
number = random.Next();
if (number % 2 == 0)
code = (char)('0' + (char)(number % 10));
else
code = (char)('A' + (char)(number % 26));
checkCode += code.ToString();
}
return checkCode;
}
/// <summary>
/// 生成图片
/// </summary>
/// <param name="checkCode">string</param>
private void CreateCheckCodeImage(string checkCode)
{
if (checkCode == null || checkCode.Trim() == String.Empty)
return;
//Bitmap image = new Bitmap((int)Math.Ceiling((checkCode.Length * 12.5)), 22);
Bitmap image = new Bitmap((int)this.Width.Value,(int)this.Height.Value);
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.GreenYellow), x1, y1, x2, y2);
}
Font font = new System.Drawing.
Font("Verdana", 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, 2);
//画图片的前景噪音点
for (int i = 0; i < 80; 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.Red), 0, 0, image.Width - 1, image.Height - 1);
System.IO.MemoryStream ms = new System.IO.MemoryStream();
image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
System.Web.HttpContext.Current.Response.ClearContent();
System.Web.HttpContext.Current.Response.ContentType = "image/Gif";
System.Web.HttpContext.Current.Response.BinaryWrite(ms.ToArray());
System.Web.HttpContext.Current.Response.End();
}
finally
{
g.Dispose();
image.Dispose();
}
}
#endregion
#region 呈现
/// <summary>
/// 应用最外层标签的属性和样式属性
/// </summary>
/// <param name="writer"></param>
protected override void AddAttributesToRender(System.Web.UI.HtmlTextWriter writer)
{
writer.AddAttribute(HtmlTextWriterAttribute.Name, this.UniqueID);
writer.AddStyleAttribute(HtmlTextWriterStyle.Height, Convert.ToString(Height));
writer.AddStyleAttribute(HtmlTextWriterStyle.Width, Convert.ToString(Width));
writer.AddStyleAttribute(HtmlTextWriterStyle.BackgroundImage, ImageUrl);
writer.AddStyleAttribute(HtmlTextWriterStyle.TextAlign, Convert.ToString(TextAlign));
base.AddAttributesToRender(writer);
}
/// <summary>
/// 过滤
/// </summary>
/// <param name="obj"></param>
protected override void AddParsedSubObject(object obj)
{
//if (!(obj is LiteralControl))
// return;
//base.AddParsedSubObject(obj);
}
/// <summary>
/// 呈现最外层标签的内容
/// </summary>
/// <param name="output"></param>
protected override void RenderContents(HtmlTextWriter output)
{
output.Write(Text);
base.RenderContents(output);
}
#endregion
}
}
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace MyControls
{
public enum TextAlign
{
right, center, left
}
}
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2、生成文件，添加到工具箱，拖到页面就可以使用
<ccid_code><go:ValidateControl ID="ValidateControl1"
runat="server" BackColor="#CC3300"
BorderStyle="Solid" BorderWidth=
"1px" Font-Bold="True" Font-Italic="True"
Font-Names="Arial Black" Font-Size="Small" Step="5" Width="70px">
</go:ValidateControl>
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3、验证方法
<ccid_code>string vcode = string.Empty;
protected void Page_Load(object sender, EventArgs e)
{
vcode = ((ValidateControl)this.Login.FindControl("ValidateControl1")).Text.ToLower();
}
protected void Login_Authenticate(object sender, AuthenticateEventArgs args)
{
string Codetext = ((TextBox)this.Login.FindControl("txtValidateCode")).Text.ToLower();
if (Codetext == null)
{
this.Login.FailureText = "验证码不能为空！";
args.Authenticated = false;
return;
}
if (vcode == Codetext)
{
AuthLogCount(mycount.LogCounts, args);
}
else
{
this.Login.FailureText = "验证码输入不正确！";
args.Authenticated = false;
return;
}
}
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