成品油定价机制,洞螈,日照大润发
1、httphandler
实例1:通过生成一张动态图片输出客户端的ip地址、操作系统类型、浏览器类型
using system;
using system.web;
public class visitor : ihttphandler {
public void processrequest(httpcontext context)
{
context.response.contenttype = "image/jpeg";
using (system.drawing.bitmap bitimage = new system.drawing.bitmap(330, 300))
{
//设置画布
using (system.drawing.graphics g = system.drawing.graphics.fromimage(bitimage))
{
//ip
g.drawstring("ip:" + context.request.userhostaddress, new system.drawing.font("宋体", 20), system.drawing.brushes.red, new system.drawing.pointf(0, 0));
//操作系统
g.drawstring("操作系统:" + context.request.browser.platform, new system.drawing.font("宋体", 20), system.drawing.brushes.red, new system.drawing.pointf(0, 50));
//浏览器
g.drawstring("浏览器:" + context.request.browser.type, new system.drawing.font("宋体", 20), system.drawing.brushes.red, new system.drawing.pointf(0, 100));
}
//保存到输出流中
bitimage.save(context.response.outputstream, system.drawing.imaging.imageformat.jpeg);
}
}
public bool isreusable {
get {
return false;
}
}
}
html代码:<a href="dowload.ashx">下载</a>
using system;
using system.web;
public class dowload : ihttphandler {
public void processrequest(httpcontext context)
{
string filename = httputility.urlencode("悲剧.jpg");
context.response.contenttype = "image/jpeg";
//打开附件对话框 报文头header和设置它的值
context.response.addheader("content-disposition", "attachment:filename=" + filename);
context.response.writefile("苹果.jpg");
}
public bool isreusable {
get {
return false;
}
}
}
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