asp.net mvc项目使用到验证码，为了让以前的WebForm代码能利用上代码经过稍微的改动即可使用代码如下：
using System; using System.Collections.Generic; using System.Web; using System.Web.Mvc; using System.Web.UI; using System.Web.UI.WebControls; using System.Drawing; namespace Angel.Web.Controllers { public class CheckCodeController : Controller { // // GET: /CheckCode/ public ActionResult Index() { this.CreateCheckCodeImage(GenerateCheckCode()); return View(); } 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)); if (code == '0' || code == 'o' || code == 'L' || code == 'I') { i = i - 1; } else { checkCode += code.ToString(); } } // Response.Cookies.Add(new HttpCookie("CheckCode", checkCode)); 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); 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, 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(); } } } }
最后别忘了session的获取设置，需要在Global.asax.cs文件中新增如下代码：
/// <summary> /// MVC为了获取session参数 /// </summary> public override void Init() { PostAuthenticateRequest += (s, e) => HttpContext.Current.SetSessionStateBehavior(SessionStateBehavior.Required); base.Init(); } void MvcApplication_PostAuthenticateRequest(object sender, EventArgs e) { HttpContext.Current.SetSessionStateBehavior(SessionStateBehavior.Required); }
html页面代码：
html代码
<img alt="单击图片刷新验证码" src="https://www.jb51.net/CheckCode/Index" <br>onclick="JavaSccript:reloadImage('https://www.jb51.net/CheckCode/Index');" /><br><script type="text/javascript"> function reloadImage(url) { document.getElementById("img1").src = url + '?abc=' + Math.random(); } </script>
总结
以上所述是小编给大家介绍的asp.net MVC 在Controller控制器中实现验证码输出功能，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对脚本之家网站的支持！
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