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asp.net直接保存文件到客户端
在我们的系统的编写过程中,应该有很多的时候需要客户下载文件.我第一次的做法(应该也是大部分人的做法吧?)是:
1 httpresponse response = httpcontext.current.response;
2 string js = "<script language=javascript>window.open('{0}');</script>";
3 js = string.format(js, url);
4 response.write(js);
5 但是有个问题了,就是会被广告拦截软件直接拦截掉,另我非常的头痛,于是寻找更好的解决方法.看了用response.binarywrite写文件流一文之后觉得确实可以如此,修改代码如下:
1/**//// <summary>
2 /// 下载文件
3 /// </summary>
4 /// <param name="filename">文件物理地址</param>
5
6protected void downloadfile(string filename)
7 {
8 string savefilename = "test.xls";
9 int intstart = filename.lastindexof("\\")+1;
10 savefilename = filename.substring(intstart,filename.length-intstart);
11 filestream myfilestream;
12 long filesize;
13
14 myfilestream = new filestream(filename,filemode.open);
15 filesize = myfilestream.length;
16
17 byte[] buffer = new byte[(int)filesize];
18 myfilestream.read(buffer, 0, (int)filesize);
19 myfilestream.close();
20
21 response.addheader("content-disposition", "attachment;filename="+savefilename);
22 response.contentencoding = system.text.encoding.getencoding("gb2312");
23 response.contenttype = "application/vnd.ms-excel";
24
25 response.binarywrite(buffer);
26 response.flush();
27 response.close();
28 response.end();
29
30 }
31
但是有个严重的问题，就是文件格式。这样只是将流输出，且无法正确识别格式。还好，能人层出不穷， 柚子nan 提出了能否不考虑文件的类型，直接把文件显示到浏览器(response) 的想法正好切中我的要害所在，于是急忙研究了柚子nan的想法，修改出最后代码：
1 /**//// <summary>
2 /// 下载文件
3 /// </summary>
4 /// <param name="filename">文件物理地址</param>
5 protected void downloadfile(string filename)
6 {
7 string savefilename = "test.xls";
8 int intstart = filename.lastindexof("\\")+1;
9 savefilename = filename.substring(intstart,filename.length-intstart);
10
11 response.clear();
12 response.charset = "utf-8";
13 response.buffer= true;
14 this.enableviewstate = false;
15 response.contentencoding = system.text.encoding.utf8;
16
17 response.appendheader("content-disposition","attachment;filename=" + savefilename);
18 response.writefile(filename);
19 response.flush();
20 response.close();
21
22 response.end();
23 }
