Validate.aspx.cs

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using System;
using System.IO;
using System.Web;
using System.Web.UI;
using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;

	/// <summary>
	/// Validate 的摘要说明。
	/// </summary>
	partial class Validate : System.Web.UI.Page
	{
		private void Page_Load(object sender, EventArgs e)
		{
			string strValidateCode = ValidateCode(4);//取得随机字符串，并设置Session值
			DrawValidateCode(strValidateCode,50,100);//绘图
		}
    
		//绘图
		private void DrawValidateCode(string strValidateCode,int intFgNoise,int intBgNoise)
		{
			if(strValidateCode == null || strValidateCode.Trim() == String.Empty)
			{
				return;
			}
			else
			{
				//建立一个位图文件 确立长宽
				Bitmap bmpImage = new Bitmap((int)Math.Ceiling((strValidateCode.Length * 12.5)), 22);
				Graphics grpGraphics = Graphics.FromImage(bmpImage);
    
				try
				{
					//生成随机生成器
					Random rndRandom = new Random();
    
					//清空图片背景色
					grpGraphics.Clear(Color.White);
    
					//画图片的背景噪音线
					for(int i=0; i<intBgNoise; i++)
					{
						int int_x1 = rndRandom.Next(bmpImage.Width);
						int int_x2 = rndRandom.Next(bmpImage.Width);
						int int_y1 = rndRandom.Next(bmpImage.Height);
						int int_y2 = rndRandom.Next(bmpImage.Height);
    
						grpGraphics.DrawLine(new Pen(Color.Silver), int_x1, int_y1, int_x2, int_y2);
					}
					//把产生的随机数以字体的形式写入画面
					Font font = new Font("Arial", 12, (FontStyle.Bold | FontStyle.Italic));
					LinearGradientBrush brhBrush = new LinearGradientBrush(new Rectangle(0, 0, bmpImage.Width, bmpImage.Height), Color.Blue, Color.DarkRed, 1.2f, true);
					grpGraphics.DrawString(strValidateCode, font, brhBrush, 2, 2);
    
					//画图片的前景噪音点
					for(int i=0; i<intFgNoise; i++)
					{
						int int_x = rndRandom.Next(bmpImage.Width);
						int int_y = rndRandom.Next(bmpImage.Height);