mvc3的验证码
mvc3 验证码,用Html扩展来实现
1.类代码如下
public static class ValidateCode { /// <summary> /// 验证码的最大长度 /// </summary> public static int MaxLength { get { return 10; } } /// <summary> /// 验证码的最小长度 /// </summary> public static int MinLength { get { return 1; } } /// <summary> /// 生成验证码 /// </summary> /// <returns></returns> public static MvcHtmlString GetValidateCode(this HtmlHelper helper) { return MvcHtmlString.Create("/Home/ValidateCode"); } /// <summary> /// 生成验证码 /// </summary> /// <param name="length">指定验证码的长度</param> /// <returns></returns> public static string CreateValidateCode(int length) { int[] randMembers = new int[length]; int[] validateNums = new int[length]; string validateNumberStr = ""; //生成起始序列值 int seekSeek = unchecked((int)DateTime.Now.Ticks); Random seekRand = new Random(seekSeek); int beginSeek = (int)seekRand.Next(0, Int32.MaxValue - length * 10000); int[] seeks = new int[length]; for (int i = 0; i < length; i++) { beginSeek += 10000; seeks[i] = beginSeek; } //生成随机数字 for (int i = 0; i < length; i++) { Random rand = new Random(seeks[i]); int pownum = 1 * (int)Math.Pow(10, length); randMembers[i] = rand.Next(pownum, Int32.MaxValue); } //抽取随机数字 for (int i = 0; i < length; i++) { string numStr = randMembers[i].ToString(); int numLength = numStr.Length; Random rand = new Random(); int numPosition = rand.Next(0, numLength - 1); validateNums[i] = Int32.Parse(numStr.Substring(numPosition, 1)); } //生成验证码 for (int i = 0; i < length; i++) { validateNumberStr += validateNums[i].ToString(); } return validateNumberStr; } /// <summary> /// 创建验证码的图片 /// </summary> /// <param name="validateCode">验证码</param> public static byte[] CreateValidateGraphic(string validateCode) { Bitmap image = new Bitmap((int)Math.Ceiling(validateCode.Length * 12.0), 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); //画图片的干扰线 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 Font("Arial", 12, (FontStyle.Bold | FontStyle.Italic)); LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2f, true); g.DrawString(validateCode, font, brush, 3, 2); //画图片的前景干扰点 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); //保存图片数据 MemoryStream stream = new MemoryStream(); image.Save(stream, ImageFormat.Jpeg); //输出图片流 return stream.ToArray(); } finally { g.Dispose(); image.Dispose(); } } /// <summary> /// 得到验证码图片的长度 /// </summary> /// <param name="validateNumLength">验证码的长度</param> /// <returns></returns> public static int GetImageWidth(int validateNumLength) { return (int)(validateNumLength * 12.0); } /// <summary> /// 得到验证码的高度 /// </summary> /// <returns></returns> public static double GetImageHeight() { return 22.5; } }
2.定义个Action
/// <summary> /// 验证码的action /// </summary> /// <returns></returns> public ActionResult ValidateCode() { return File(Framework.UI.ValidateCode.CreateValidateGraphic(Framework.UI.ValidateCode.CreateValidateCode(4)), @"image/jpeg"); }
3.Razor调用
<img src="@Html.GetValidateCode()" alt="" id="vadimg" title="看不清楚请刷新!" onclick="this.src='@Html.GetValidateCode()?';+(new Date().getTime());" style="cursor:pointer" align="absmiddle">
(7)条评论 订阅
是应该搞个代码的插件,要不复制过去担心不好使。
这个只是示例代码,命名空间需要自己修改一下
挺不错的代码段
向博主学习
return File(Framework.这里报Framework不存在。
你的网站速度很快啊?用的是什么.net 程序?
这个我拷到VS中试一下。
为什么不整个代码高亮显示的插件呢!