FmcmsUi/images/Checkcode.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();
               // if (number % 2 == 0)
                //{
                    code = (char)('0' + (char)(number % 10));
                //}
                //else
                //{
                //    if (number % 3 == 0)
                //    {
                //        code = (char)('A' + (char)(number % 26));
                //    }
                //    else
                //    {
                //        code = (char)('a' + (char)(number % 26));
                //    }
                //}
                Response.Write(number);
                checkCode += code.ToString();

            }
			Session["CheckCode"]=checkCode;//保存CheckCode用于在登陆页面使用
			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