Web/VCode.aspx.cs

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using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Drawing;
using System.Web.SessionState;

/// <summary>
/// 生成验证码
/// </summary>
public partial class VCode_VCode : System.Web.UI.Page
{
    private int width = 70;
    private int height = 25;

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!string.IsNullOrEmpty(Request.QueryString["width"]))
        {
            width = int.Parse(Request.QueryString["width"]);
            height = int.Parse(Request.QueryString["height"]);
        }
        this.CreateCheckCodeImage(GenerateCheckCode(4));
    }
    private string GenerateCheckCode(int num)
    {
        //char[] s = new char[] { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z' };
        //char[] s = new char[] { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' };
        char[] s = new char[] { 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'j', 'k', 'm', 'n',  'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H','J', 'K', 'L', 'M', 'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z' };
        string checkCode = String.Empty;
        Random random = new Random();
        for (int i = 0; i < num; i++)
        {
            checkCode += s[random.Next(0, s.Length)].ToString();
        }
        Session["CheckCode"] = checkCode.ToLower();
        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);
        System.Drawing.Bitmap image = new System.Drawing.Bitmap(width, height);
        Graphics g = Graphics.FromImage(image);

        try
        {