ValidateCode.aspx.cs

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using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;

namespace SCard
{
	/// <summary>
	/// 验证码生成器
	/// </summary>
	public partial class ValidateCode : System.Web.UI.Page
	{
		protected void Page_Load(object sender, System.EventArgs e)
		{
			this.CreateCheckCodeImage(GenerateCheckCode());
		}
		private string GenerateCheckCode()
		{
			int number;
			char code;
			string checkCode = String.Empty;
			System.Random random = new Random();
			for(int i=0; i<4; i++)
			{
				number = random.Next();
	　　　　　　code = (char)('0' + (char)(number % 10));
				checkCode += code.ToString();
			}
			
			Session["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", 13, (System.Drawing.FontStyle.Bold));