Simple production of asp.net verification code

In fact, there are already many articles about the production of asp.net verification code, but today I still want to share it with you. Dear, you can combine several examples to write an ASP.NET verification code suitable for your own website, probably There are only two parts:

First create an asp.net form ValidateCode.aspx; do not write anything. Write the following code directly in the background ValidateCode.aspx.cs:

protected void Page_Load(object sender, EventArgs e) { string validateCode = CreateValidateCode();//生成验证码 Bitmap bitmap = new Bitmap(imgWidth,imgHeight);//生成Bitmap图像 DisturbBitmap(bitmap); //图像背景 DrewValidateCode(bitmap,validateCode);//绘制验证码图像 bitmap.Save(Response.OutputStream,ImageFormat.Gif);//保存图像，等待输出 } private int codeLen = 4;//验证码长度 private int fineness = 85;//图片清晰度 private int imgWidth = 48;//图片宽度 private int imgHeight = 24;//图片高度 private string fontFamily = "Times New Roman";//字体名称 private int fontSize = 14;//字体大小 //private int fontStyle = 0;//字体样式 private int posX = 0;//绘制起始坐标X private int posY = 0;//绘制坐标Y private string CreateValidateCode() //生成验证码 { string validateCode = ""; Random random = new Random();// 随机数对象 for (int i = 0; i < codeLen; i++)//循环生成每位数值 { int n = random.Next(10);//数字 validateCode += n.ToString(); } Session["vcode"] = validateCode;//保存验证码 这Session是在前台调用的。 return validateCode;// 返回验证码 } private void DisturbBitmap(Bitmap bitmap)//图像背景 { Random random = new Random();//通过随机数生成 for (int i = 0; i < bitmap.Width; i++)//通过循环嵌套，逐个像素点生成 { for (int j = 0; j < bitmap.Height; j++) { if (random.Next(90) <= this.fineness) bitmap.SetPixel(i, j, Color.LightGray); } } } private void DrewValidateCode(Bitmap bitmap, string validateCode)//绘制验证码图像 { Graphics g = Graphics.FromImage(bitmap);//获取绘制器对象 Font font = new Font(fontFamily, fontSize, FontStyle.Bold);//设置绘制字体 g.DrawString(validateCode, font, Brushes.Black, posX, posY);//绘制验证码图像 }

Login.aspx form front desk:

//这个函数是在点击验证码图片就会更换验证码 //可以使用微软自带的jqury.js 下面jquery-1.4.1.min.js版本之上的。或者在jquery官网上下载就可以。  function f_refreshtype() { var Image1 = document.getElementByIdx_x_x_x("img"); if (Image1 != null) { Image1.src = Image1.src + "?"; } } ---//调用函数，实现更换验证码

Backend code: Click login to verify whether the user input is correct .

string usercode = txtcode.Text.Trim(); if (usercode == Session["vcode"].ToString())//Session["vcode"] { }

Other codes are the same as others.

The above is the process of generating ASP.NET verification code shared with you. I hope you can apply what you have learned.

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