1 /// <summary> 2 /// 下载文件 TransmitFile 3 /// </summary> 4 /// <param name="filePath"></param> 5 public static void DownloadFile(
string filePath)
6 {
7 string filename = HttpContext.Current.Server.MapPath(filePath);
8 var response = HttpContext.Current.Response;
9 response.ContentType =
"application/x-zip-compressed";
10 response.AddHeader(
"Content-Disposition",
"attachment;filename=" + Path.GetFileName(filename) );
11 response.TransmitFile(filename);
12 }
13 14 /// <summary>15 /// 下载大文件16 /// </summary>17 /// <param name="filePath"></param>18 public static void DownloadBigFile(
string filePath)
19 {
20 filePath = HttpContext.Current.Server.MapPath(filePath);
//路径21 string fileName = Path.GetFileName(filePath);
//客户端保存的文件名22 var response = HttpContext.Current.Response;
23 System.IO.FileInfo fileInfo =
new System.IO.FileInfo(filePath);
24 if (fileInfo.Exists ==
true)
25 {
26 const long ChunkSize =
102400;
//100K 每次读取文件，只读取100K，这样可以缓解服务器的压力27 28 byte[] buffer =
new byte[ChunkSize];
29 30 response.Clear();
31 System.IO.FileStream iStream = System.IO.File.OpenRead(filePath);
32 long dataLengthToRead = iStream.Length;
//获取下载的文件总大小33 response.ContentType =
"application/octet-stream";
34 response.AddHeader(
"Content-Disposition",
"attachment; filename=" + HttpUtility.UrlEncode(fileName));
35 while (dataLengthToRead >
0 && response.IsClientConnected)
36 {
37 //读取的大小 Response.OutputStream.Write(buffer, 0, lengthRead);38 int lengthRead = iStream.Read(buffer,
0, Convert.ToInt32(ChunkSize));
39 response.Flush();
40 dataLengthToRead = dataLengthToRead - lengthRead;
41 }
42 43 response.Close();
44 }
45 }
46 47 /// <summary>48 /// 流方式下载49 /// </summary>50 /// <param name="filePath"></param>51 public static void DownloadFileStream(
string filePath)
52 {
53 filePath = HttpContext.Current.Server.MapPath(filePath);
//路径54 string fileName = Path.GetFileName(filePath);
//客户端保存的文件名55 var response = HttpContext.Current.Response;
56 FileStream fs =
new FileStream(filePath, FileMode.Open);
57 58 byte[] bytes =
new byte[(
int)fs.Length]; fs.Read(bytes,
0, bytes.Length);
59 60 fs.Close();
61 response.ContentType =
"application/octet-stream";
62 //通知浏览器下载文件而不是打开63 response.AddHeader(
"Content-Disposition",
"attachment; filename=" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8));
64 response.BinaryWrite(bytes);
65 response.Flush();
66 response.End();
67 }
68 69 /// <summary>70 /// 将文本作为某文件下载71 /// </summary>72 /// <param name="text"></param>73 /// <param name="fileName"></param>74 public static void DownloadText(
string text ,
string fileName)
75 {
76 byte[] bytes = Encoding.Default.GetBytes(text);
77 var response = HttpContext.Current.Response;
78 response.ContentType =
"application/octet-stream";
79 //通知浏览器下载文件而不是打开80 response.AddHeader(
"Content-Disposition",
"attachment; filename=" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8));
81 response.BinaryWrite(bytes);
82 response.Flush();
83 response.End();
84 }
转载于:https://www.cnblogs.com/davidyang78/archive/2011/09/21/2183134.html
相关资源：Asp.net及C#全局变量使用方法汇总
