压缩文件的使用

首先引入dll文件icsharpcode.sharpziplib.dll 管理nuget包里面下载

压缩文件

 1 /// <summary>
 2 /// 压缩文件
 3 /// </summary>
 4 /// <param name="filename">要压缩的所有文件（完全路径)</param>
 5 /// <param name="filename">文件名称</param>
 6 /// <param name="name">压缩后文件路径</param>
 7 /// <param name="level">压缩级别</param>
 8 public void zipfilemain(string[] filenames, string[] filename, string name, int level)
 9 {
10     zipoutputstream s = new zipoutputstream(file.create(name));
11     crc32 crc = new crc32();
12     //压缩级别
13     s.setlevel(level); // 0 - store only to 9 - means best compression
14     try
15     {
16         int m = 0;
17         foreach (string file in filenames)
18         {
19             //打开压缩文件
20             filestream fs = file.openread(file);//文件地址
21             byte[] buffer = new byte[fs.length];
22             fs.read(buffer, 0, buffer.length);
23             //建立压缩实体
24             zipentry entry = new zipentry(filename[m].tostring());//原文件名
25             //时间
26             entry.datetime = datetime.now;
27             //空间大小
28             entry.size = fs.length;
29             fs.close();
30             crc.reset();
31             crc.update(buffer);
32             entry.crc = crc.value;
33             s.putnextentry(entry);
34             s.write(buffer, 0, buffer.length);
35             m++;
36         }
37     }
38     catch
39     {
40         throw;
41     }
42     finally
43     {
44         s.finish();
45         s.close();
46     }
47 }

 

文件下载

 

 1 //下载打包文件
 2     private void downloadfile(string filename, string filepath)
 3     {
 4         fileinfo fileinfo = new fileinfo(filepath);
 5         response.clear();
 6         response.clearcontent();
 7         response.clearheaders();
 8         response.addheader("content-disposition", "attachment;filename=" + filename);
 9         response.addheader("content-length", fileinfo.length.tostring());
10         response.addheader("content-transfer-encoding", "binary");
11         response.contenttype = "application/octet-stream";
12         response.contentencoding = system.text.encoding.getencoding("gb2312");
13         response.writefile(fileinfo.fullname);
14         response.flush();
15         file.delete(filepath);//删除已下载文件
16         response.end();
17     }

 

具体使用

 1 protected void btndownloadfiles_click(object sender, eventargs e)
 2     {
 3         list<string> listfj = new list<string>();//保存附件路径
 4         list<string> listfjname = new list<string>();//保存附件名字
 5         for (int i = 0; i < gridview.rows.count; i++)
 6         {
 7             htmlinputcheckbox chk = (page.master.findcontrol("contentplaceholder1").findcontrol("gridview") as gridview).rows[i].findcontrol("checkboxname") as htmlinputcheckbox;
 8             if (chk != null && chk.checked)
 9             {
10                 string temp = gridview.rows[i].cells[14].text.tostring().trim();
11                 if (temp != " ")
12                 {
13                     listfj.add(server.mappath("~") + temp);
14                     listfjname.add(temp);
15                 }
16             }
17         }
18         string time = datetime.now.ticks.tostring();
19         zipfilemain(listfj.toarray(), listfjname.toarray(), server.mappath("~/uploadfiles/" + time + ".zip"), 9);//压缩文件
20         downloadfile(server.urlencode("附件.zip"), server.mappath("~/uploadfiles/" + time + ".zip"));//下载文件
21     }