发布网友 发布时间:2022-12-30 03:39
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热心网友 时间:2023-10-28 23:22
添加一个web窗体 然后将下面的代码添加进去 并重命名该窗体为checkCode aspx; public class ValidateCode : System Web UI Page { private void Page_Load(object sender System EventArgs e) { this CreateCheckCodeImage(GenerateCheckCode()) } #region Web 窗体设计器生成的代码 override protected void OnInit(EventArgs e) { // // CODEGEN: 该调用是 ASP NET Web 窗体设计器所必需的 // InitializeComponent() base OnInit(e) } /// <summary> /// 设计器支持所需的方法 不要使用代码编辑器修改 /// 此方法的内容 /// </summary> private void InitializeComponent() { this Load += new System EventHandler(this Page_Load) } #endregion private string GenerateCheckCode() { int number; char code; string checkCode = String Empty; System Random random = new Random() for(int i= ; i< ; i++) { number = random Next() if(number % == ) code = (char)( + (char)(number % )) else code = (char)( A + (char)(number % )) checkCode += code ToString() } Response Cookies Add(new HttpCookie( 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 * )) ) 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= ; i< ; i++) { int x = random Next(image Width) int x = random Next(image Width) int y = random Next(image Height) int y = random Next(image Height) g DrawLine(new Pen(Color Silver) x y x y ) } Font font = new System Drawing Font( Arial (System Drawing FontStyle Bold | System Drawing FontStyle Italic)) System Drawing Drawing D LinearGradientBrush brush = new System Drawing Drawing D LinearGradientBrush(new Rectangle( image Width image Height) Color Blue Color DarkRed f true) g DrawString(checkCode font brush ) //画图片的前景噪音点 for(int i= ; i< ; 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) image Width image Height ) 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() } } } 在你要显示验证码的窗体中添加一个image控件 并命名为imgCheckCode 用于显示验证码 再添加一个lable 并命名为lblMessage 用于显示错误信息 然后在该窗体的Page_Load中添加 this imgCheckCode ImageUrl = checkCode aspx ; 在登录页面的登录按钮的处理事件中使用以下代码判断验证码 private void btnLogin_Click(object sender System Web UI ImageClickEventArgs e) { if(Request Cookies[ checkCode ] == null) { lblMessage Text = 您的浏览器设置已被禁用 Cookies 您必须设置浏览器允许使用 Cookies 选项后才能使用本系统 ; lblMessage Visible = true; return; } if(String Compare(Request Cookies[ checkCode ] Value txtCheckCode Text true) != ) { lblMessage Text = 验证码错误 请输入正确的验证码 ; lblMessage Visible = true; return; } } 这样就能实现你所要的验证码验证了 lishixin/Article/program/net/201311/13119