SiteAdmin/code.aspx.cs

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using System;
using System.Collections.Generic;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Drawing;

public partial class SiteAdmin_code : System.Web.UI.Page
{
    //  <summary>
    ///  完美随机验证码  0.10
    ///  Verion:0.10
    ///  Description:随机生成设定验证码，并随机旋转一定角度，字体颜色不同
    ///  </summary>
    protected void Page_Load(object sender, EventArgs e)
    {
        string randomcode = this.CreateRandomCode(4);
        Session["safecode"] = randomcode;
        //ViewState["ValidateCode"]  =  randomcode;
        this.CreateImage(randomcode);
    }

    ///  <summary>
    ///  生成随机码
    ///  </summary>
    ///  <param  name="length">随机码个数</param>
    ///  <returns></returns>
    private string CreateRandomCode(int length)
    {
        int rand;
        char code;
        string randomcode = String.Empty;

        //生成一定长度的验证码
        System.Random random = new Random();
        for (int i = 0; i < length; i++)
        {
            rand = random.Next();

            if (rand % 3 == 0)
            {
                code = (char)('a' + (char)(rand % 26));
            }
            else
            {
                code = (char)('0' + (char)(rand % 10));
            }

            randomcode += code.ToString();
        }
        return randomcode;
    }

    ///  <summary>
    ///  创建随机码图片
    ///  </summary>
    ///  <param  name="randomcode">随机码</param>
    private void CreateImage(string randomcode)
    {
        int randAngle = 45; //随机转动角度