.net教程：c#高性能在web端产生验证图片
[size=3]using system;
using system.web;
using system.drawing ;
/// <summary>
/// png 的摘要说明。
public sealed class localpng:ihttphandler
{
#region ihttphandler 成员
public void processrequest(httpcontext context)
{
if(context.request["key"]!=null&&context.request["key"].length ==4)//还有acssi码是1-9的数字和a-z的字母
{
string machine_key=context.request["key"];
context.response.clear();
try
{ //原图
bitmap simage = new bitmap(context.server.mappath("key.png.bmp")); //图片路径
//验证码图
graphics wg = graphics.fromimage(simage);
wg.drawstring(machine_key,new font("comic sans ms",14),new solidbrush(color.royalblue),3,0);
wg.save();
context.response.contenttype = "image/jpeg";
simage.save(context.response.outputstream,system.drawing.imaging.imageformat.jpeg);
wg.dispose();
simage.dispose();
}
catch(exception e)
{context.response.write(e.message);
}
context.response.end();
}
}
public bool isreusable
{
get
{
// todo: 添加 codekey.isreusable getter 实现
return false;
}
}
#endregion
}
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