C# 更有效的文件下载代码
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转自http://blog.csdn.net/littlehb/archive/2007/04/20/1572440.aspx
1.普通下载:
//下载文件的路径
string path=Server.MapPath("广告.jpg");
//下载文件的名称
string filename = "广告.jpg";
System.IO.FileInfo toDownload = new System.IO.FileInfo(path);
Response.Clear();
if (System.IO.Path.GetExtension(filename) == ".jpg")
...{
Response.AddHeader("Content-Disposition", "attachment;filename=NEW_" + HttpUtility.UrlEncode(toDownload.Name));
Response.ContentType = "application/x-zip-compressed";
Response.TransmitFile(path);
Response.End();
}
string path=Server.MapPath("广告.jpg");
//下载文件的名称
string filename = "广告.jpg";
System.IO.FileInfo toDownload = new System.IO.FileInfo(path);
Response.Clear();
if (System.IO.Path.GetExtension(filename) == ".jpg")
...{
Response.AddHeader("Content-Disposition", "attachment;filename=NEW_" + HttpUtility.UrlEncode(toDownload.Name));
Response.ContentType = "application/x-zip-compressed";
Response.TransmitFile(path);
Response.End();
}
2.大文件分成小块下载:
//下载文件的路径
string path = Server.MapPath("广告.jpg");
//下载文件的名称
string filename = "广告.jpg";
System.IO.FileInfo toDownload = new System.IO.FileInfo(path);
if (toDownload.Exists == true)
...{
const long ChunkSize = 10000;
byte[] buffer = new byte[ChunkSize];
Response.Clear();
System.IO.FileStream iStream = System.IO.File.OpenRead(path);
long dataLengthToRead = iStream.Length;
Response.ContentType = "application/octet-stream";
Response.AddHeader("Content-Disposition", "attachment; filename=new_" + HttpUtility.UrlEncode(toDownload.Name));
while (dataLengthToRead > 0 && Response.IsClientConnected)
...{
int lengthRead = iStream.Read(buffer, 0, Convert.ToInt32(ChunkSize));
Response.OutputStream.Write(buffer, 0, lengthRead);
Response.Flush();
dataLengthToRead = dataLengthToRead - lengthRead;
}
Response.Close();
}
string path = Server.MapPath("广告.jpg");
//下载文件的名称
string filename = "广告.jpg";
System.IO.FileInfo toDownload = new System.IO.FileInfo(path);
if (toDownload.Exists == true)
...{
const long ChunkSize = 10000;
byte[] buffer = new byte[ChunkSize];
Response.Clear();
System.IO.FileStream iStream = System.IO.File.OpenRead(path);
long dataLengthToRead = iStream.Length;
Response.ContentType = "application/octet-stream";
Response.AddHeader("Content-Disposition", "attachment; filename=new_" + HttpUtility.UrlEncode(toDownload.Name));
while (dataLengthToRead > 0 && Response.IsClientConnected)
...{
int lengthRead = iStream.Read(buffer, 0, Convert.ToInt32(ChunkSize));
Response.OutputStream.Write(buffer, 0, lengthRead);
Response.Flush();
dataLengthToRead = dataLengthToRead - lengthRead;
}
Response.Close();
}
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