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c# .net 生成图片验证码的代码

.net framework 的类库真是太强了, 用 GDI+ 可以干N多N多事情。
    代码如下:
    <%@ Page Language="C#" AutoEventWireup="True" %>
    <%@ import Namespace="System.Drawing"%>
    <%@ import Namespace="System.Drawing.Drawing2D"%>
    <%@ import Namespace="System.Web"%>
    <script runat="server">
    private void Page_Load(object sender, System.EventArgs e)
    {
    String sRndStr=checkcode.rndStr(4);
    checkcode.general(sRndStr);
    }
    /*-----------------------------------------------------------------------------------*
    * shawl.qiu c# .net checkcode class v1.0
    *-----------------------------------------------------------------------------------*/
    //---------------------------------------------------------------------begin class checkcode
    public class checkcode
    {
    //-----------------------------------begin event
    public checkcode()
    {
    }
    ~checkcode()
    {
    }
    //-----------------------------------end event
    //-----------------------------------begin public constant
    //-----------------------begin about
    public const String auSubject="shawl.qiu c# .net checkcode class";
    public const String auVersion="v1.0";
    public const String au="shawl.qiu";
    public const String auEmail="shawl.qiu@gmail.com";
    public const String auBlog="http://blog.csdn.net/btbtd";
    public const String auCreateDate="2007-2-1";
    //-----------------------end about
    //-----------------------------------end public constant
    //-----------------------------------begin public static method
    public static void general(String sCc)
    {
    Int32 ccLen=sCc.Length;
    String ccFtFm="Arial";
    Int32 ccFtSz=12;
    Int32 ccWidth=ccLen*ccFtSz+1;
    Int32 ccHeight=ccFtSz+5;
    using(Bitmap oImg = new Bitmap(ccWidth, ccHeight))
    {
    using(Graphics oGpc=Graphics.FromImage(oImg))
    {
    HatchBrush hBrush = new HatchBrush(HatchStyle.DashedVertical,
    Color.Yellow, Color.Silver);
    oGpc.FillRectangle(hBrush, 0, 0, ccWidth, ccWidth);
    oGpc.DrawString(sCc,new System.Drawing.Font(ccFtFm,ccFtSz, FontStyle.Bold),
    new System.Drawing.SolidBrush(Color.Black),0,0);
    //-----------------------边框
    Pen blackPen = new Pen(Color.Black, 1);
    oGpc.DrawLine(blackPen, 0, ccHeight, 0, 0); // 左竖线
    oGpc.DrawLine(blackPen, 0,0,ccWidth,0); // 顶横线
    oGpc.DrawLine(blackPen, ccWidth-1,0,ccWidth-1,20); // 右竖线
    oGpc.DrawLine(blackPen, 0, ccHeight-1, ccWidth, ccHeight-1); // 底横线
    writeImg(oImg);
    }
    }
    } // end public static void general
    public static String rndStr(Int32 len)
    {
    String sTemp="";
    String sForRnd="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[] aRnd=sForRnd.Split(,);
    Random oRnd=new Random();
    Int32 iArLen=aRnd.Length;
    for(Int32 i=0; i<len; i++)
    {
    sTemp+=aRnd[oRnd.Next(0,iArLen)];
    }
    return sTemp;
    } // end public static String rndStr
    //-----------------------------------end public static method
    //-----------------------------------begin private static method
    private static void writeImg(Bitmap oImg)
    {
    using(System.IO.MemoryStream ms=new System.IO.MemoryStream())
    {
    oImg.Save(ms,System.Drawing.Imaging.ImageFormat.Png);
    HttpContext.Current.Response.ClearContent();
    HttpContext.Current.Response.ContentType="image/Png";
    HttpContext.Current.Response.BinaryWrite(ms.ToArray());
    }
    } // end private static void writeImg
    }
    //---------------------------------------------------------------------end class checkcode
补充:Web开发 , ASP.Net ,
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