codecheck.aspx.cs

很好的毕业设计拿了可以直接用

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

public partial class Default2 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
         string checkCode = CreateRandomCode(4);
          Session["CheckCode"] = checkCode;
          CreateImage(checkCode);
    }
     private string CreateRandomCode(int codeCount)
    {

        // 函数功能:产生数字和字符混合的随机字符串
        string allChar = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
        char[] allCharArray = allChar.ToCharArray();
        string randomCode = "";
        Random rand = new Random();
        for (int i = 0; i < codeCount; i++)
        {
           int r=rand.Next(61);
           randomCode+=allCharArray.GetValue(r);
        }
         return randomCode;
        
     }
         

    private void CreateImage(string checkCode)
    {

        // 生成图象验证码函数
       int iwidth = (int)(checkCode.Length * 11.5);
        System.Drawing.Bitmap image = new System.Drawing.Bitmap(iwidth, 20);
        Graphics g = Graphics.FromImage(image);
        Font f = new System.Drawing.Font("Arial", 10, System.Drawing.FontStyle.Bold);
        Brush b = new System.Drawing.SolidBrush(Color.Azure);//字母白色
        //g.FillRectangle(new System.Drawing.SolidBrush(Color.Blue),0,0,image.Width, image.Height);
        g.Clear(Color.Brown);//背景灰色
        g.DrawString(checkCode, f, b, 3, 3);

        Pen blackPen = new Pen(Color.Black, 0);
        Random rand = new Random();
        System.IO.MemoryStream ms = new System.IO.MemoryStream();
        image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
        Response.ClearContent();
        Response.ContentType = "image/Jpeg";
        Response.BinaryWrite(ms.ToArray());
        g.Dispose();
        image.Dispose();

        

    }
}