把下面代碼存為一個(gè)文件code.aspx。另一個(gè)文件里調(diào)用<img src="code.aspx">


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 Default4 : System.Web.UI.Page
{
??? protected void Page_Load(object sender, EventArgs e)
??? {
??????? if(!Page.IsPostBack)
??????? {
??????????? getimg(getcode(4));
??????? }
??? }

??? public string getcode(int num)
??? {

??????? string[] source ={ "1", "A", "B", "4", "C", "6", "7", "8", "9", "Q", "W", "Y", "U", "O", "P" };
??????? //string[] source ={ "A", "B", "C", "Q", "W", "Y", "U", "O", "P" };
??????? string code = "";
??????? Random rm = new Random();
??????? for(int i = 0; i < num; i++)
??????? {
??????????? code += source[rm.Next(0, source.Length)];
??????? }
??????? return code;
??? }

??? public void getimg(string code)
??? {
??????? Bitmap myPalette = new Bitmap(60, 20);
??????? Graphics gh = Graphics.FromImage(myPalette);
??????? Rectangle rc = new Rectangle(0, 0, 60, 20);
??????? gh.FillRectangle(new SolidBrush(Color.Silver), rc);
??????? gh.DrawString(code, new Font("宋體", 16), new SolidBrush(Color.Gray), rc);
??????? myPalette.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);
??????? Session["ValidataCode"] = code;
??????? gh.Dispose();
??????? myPalette.Dispose();

??? }
}

轉(zhuǎn)載于:https://www.cnblogs.com/eebb/archive/2007/04/12/710888.html

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