yz.aspx.cs

ASP.NET2.0开发一个类似BtoC、CtoC的企业产品信息发布系统。

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;
using System.IO;
using System.Drawing.Imaging;

public partial class yz : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        string strNum = Rndnum();
        Session["Num"] = strNum;
        ValidateCode(strNum);
    }

    public void ValidateCode(string vnum)
    {
        MemoryStream ms = new MemoryStream();
        double Height = (vnum.Length) * 11;
        int gHeight = Convert.ToInt32(Height);
        Bitmap img = new Bitmap(gHeight, 20);
        Graphics g = Graphics.FromImage(img); g.DrawString(vnum, (new Font("幼圆", 13)), (new SolidBrush(Color.Blue)), 0, 0);
        img.Save(ms, ImageFormat.Png);
        Response.ClearContent();
        Response.ContentType = "image/Bmp";
        Response.BinaryWrite(ms.ToArray());
        g.Dispose();
        img.Dispose();
        Response.End();
    }

    public string Rndnum()
    {
        int j1;
        string strChoice = "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";
        string[] strResult = strChoice.Split(new Char[] { ',' });
        string strReturn = "";
        Random rnd = new Random(unchecked((int)DateTime.Now.Ticks));
        for (int i = 0; i < 4; i++)
        {
            Random rnd1 = new Random(rnd.Next() * unchecked((int)DateTime.Now.Ticks));
            j1 = rnd1.Next(35);
            rnd = new Random(rnd.Next() * unchecked((int)DateTime.Now.Ticks));
            strReturn = strReturn + strResult[j1].ToString();
        }
        return strReturn;
    }

}