asp.net response.ContentType 下载文件的四种方法

 protected void Button1_Click(object sender, EventArgs e)

    {



 1

 protected void Button1_Click(object sender, EventArgs e)
 2

    {
 3

        //TransmitFile实现下载
 4


 5

        /*
 6

         微软为Response对象提供了一个新的方法TransmitFile来解决使用Response.BinaryWrite
 7

         下载超过400mb的文件时导致Aspnet_wp.exe进程回收而无法成功下载的问题。
 8

         代码如下：
 9

        */
10


11

        Response.ContentType = "application/x-zip-compressed";
12

        Response.AddHeader("Content-Disposition", "attachment;filename=keji.rar");
13

        string filename = Server.MapPath("keji.rar");
14

        Response.TransmitFile(filename);
15

        Response.Write("<script language=\<
span="" style="word-wrap: break-word;">"javascript\" type=\"text/javascript\">");
16

        Response.Write("alert(\"下载成功\");");
17

        Response.Write("window.location.href=\"C_SC.aspx\";");
18

        Response.Write("");
19


20

    }
21

    protected void Button2_Click(object sender, EventArgs e)
22

    {
23


24

        //WriteFile实现下载
25

        string fileName = "ceshi.rar";//客户端保存的文件名
26

        string filePath = Server.MapPath("keji.rar");//路径
27


28

        FileInfo fileInfo = new FileInfo(filePath);
29

        Response.Clear();
30

        Response.ClearContent();
31

        Response.ClearHeaders();
32

        Response.AddHeader("Content-Disposition", "attachment;filename=" + fileName);
33

        Response.AddHeader("Content-Length", fileInfo.Length.ToString());
34

        Response.AddHeader("Content-Transfer-Encoding", "binary");
35

        Response.ContentType = "application/octet-stream";
36

        Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");
37

        Response.WriteFile(fileInfo.FullName);
38

        Response.Flush();
39

        Response.End();
40


41

    }
42

    protected void Button3_Click(object sender, EventArgs e)
43

    {
44

        //WriteFile分块下载
45


46

        string fileName = "GhostXP.iso";//客户端保存的文件名
47

        string filePath = Server.MapPath("GhostXP7.7.iso");//路径
48


49

         System.IO.FileInfo fileInfo = new System.IO.FileInfo(filePath);
50


51

        if (fileInfo.Exists == true)
52

         {
53

            const long ChunkSize = 409600;//100K 每次读取文件，只读取100Ｋ，这样可以缓解服务器的压力
54

            byte[] buffer = new byte[ChunkSize];
55


56

             Response.Clear();
57

             System.IO.FileStream iStream = System.IO.File.OpenRead(filePath);
58

            long dataLengthToRead = iStream.Length;//获取下载的文件总大小
59

             Response.ContentType = "application/octet-stream";
60

             Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName));
61

            while (dataLengthToRead > 0 && Response.IsClientConnected)
62

             {
63

                int lengthRead = iStream.Read(buffer, 0, Convert.ToInt32(ChunkSize));//读取的大小
64

                 Response.OutputStream.Write(buffer, 0, lengthRead);
65

                 Response.Flush();
66

                 dataLengthToRead = dataLengthToRead - lengthRead;
67

             }
68

             Response.Close();
69

         }
70

     }
71


72

    //字符流方式下载文件
73

    protected void Button4_Click(object sender, EventArgs e)
74

    {
75

        string fileName = "ce2.rar";//客户端保存的文件名
76

        string filePath = Server.MapPath("keji.rar");//路径
77


78

        //以字符流的形式下载文件
79

        FileStream fs = new FileStream(filePath, FileMode.Open);
80

        byte[] bytes = new byte[(int)fs.Length];
81

        fs.Read(bytes, 0, bytes.Length);
82

        fs.Close();
83

        Response.ContentType = "application/octet-stream";
84

        //通知浏览器下载文件而不是打开
85

        Response.AddHeader("Content-Disposition", "attachment;   filename=" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8));
86

        Response.BinaryWrite(bytes);
87

        Response.Flush();
88

        Response.End();
89


90

    }