从目录下载文件 [英] Download file from a directory
问题描述
我遇到了无法通过指定文件路径来下载文件的情况，但问题是该文件是以未知格式下载的.下面的代码显示了下载过程:
如果(e.CommandName =="ViewFiles")
{
int索引= Convert.ToInt32(e.CommandArgument);
GridViewRow行= gvunclassified.Rows [index];
字符串除法= row.Cells [4] .Text;
字符串文件名= row.Cells [1] .Text;
字符串路径= @"NewFolder1" +"\\" +除法+"\\" +未分类" +"\\" +文件名；
字符串驱动器= @"C:\ Website2 \ RecordsManagement";
字符串temppath = Path.Combine(驱动器，路径);
//要下载的文件路径.
字符串filepath = temppath;
//用于将文件保存到客户端系统的文件名.
字符串文件名= Path.GetFileName(filepath);
System.IO.Stream stream = null;
试试
{
//将文件打开到流中.
stream =新的FileStream(filepath，System.IO.FileMode.Open，System.IO.FileAccess.Read，System.IO.FileShare.Read);
//读取的总字节数:
long bytesToRead = stream.Length;
Response.ContentType =应用程序/八位字节流";
Response.AddHeader("Content-Disposition"，"attachment; filename =" + filename);
//从一小部分读取流中的字节.
while(bytesToRead> 0)
{
//确保客户端仍处于连接状态.
如果(Response.IsClientConnected)
{
//将数据读入缓冲区并写入
//输出流.
byte []缓冲区=新的Byte [10000];
int length = stream.Read(buffer，0，10000);
Response.OutputStream.Write(buffer，0，length);
Response.Flush();
//我们已经读取了一些字节..需要读取
//仅剩下.
bytesToRead = bytesToRead-长度;
}
其他
{
//如果用户不再连接，则退出循环.
bytesToRead = -1;
}
}
}
catch(ex ex例外)
{
Response.Write(ex.Message);
//发生错误..
}
终于
{
如果(流！=空)
{
stream.Close();
}
}
任何建议将不胜感激.实际上，最令人惊讶的部分是，如果我使用google chrome作为浏览器，则文件将以正确的格式下载，但是如果我使用IE或Mozilla firefox，则会下载未知格式的文件.
I have ran into a situation where im able to download a file by specifying the file path but the issue is that the file is download in a unknown format. The code below shows the downloading process:
if (e.CommandName == "ViewFiles")
{
int index = Convert.ToInt32(e.CommandArgument);
GridViewRow row = gvunclassified.Rows[index];
string division = row.Cells[4].Text;
string filenames = row.Cells[1].Text;
string paths = @"NewFolder1" + "\\" + division + "\\" + "UnClassified" + "\\" + filenames;
string drive = @"C:\Website2\RecordsManagement";
string temppath = Path.Combine(drive, paths);
// The file path to download.
string filepath = temppath;
// The file name used to save the file to the client''s system..
string filename = Path.GetFileName(filepath);
System.IO.Stream stream = null;
try
{
// Open the file into a stream.
stream = new FileStream(filepath, System.IO.FileMode.Open, System.IO.FileAccess.Read, System.IO.FileShare.Read);
// Total bytes to read:
long bytesToRead = stream.Length;
Response.ContentType = "application/octet-stream";
Response.AddHeader("Content-Disposition", "attachment; filename=" + filename);
// Read the bytes from the stream in small portions.
while (bytesToRead > 0)
{
// Make sure the client is still connected.
if (Response.IsClientConnected)
{
// Read the data into the buffer and write into the
// output stream.
byte[] buffer = new Byte[10000];
int length = stream.Read(buffer, 0, 10000);
Response.OutputStream.Write(buffer, 0, length);
Response.Flush();
// We have already read some bytes.. need to read
// only the remaining.
bytesToRead = bytesToRead - length;
}
else
{
// Get out of the loop, if user is not connected anymore..
bytesToRead = -1;
}
}
}
catch (Exception ex)
{
Response.Write(ex.Message);
// An error occurred..
}
finally
{
if (stream != null)
{
stream.Close();
}
}
Any suggestion would be highly appreciated. Actually the most surprising part is that if I use google chrome as my browser then the file is downloaded in the right format but an unknown format file is download if I use IE or Mozilla firefox.
推荐答案
代码以下载文件
Code to Download the File
Response.ClearContent();
Response.AddHeader("Content-Disposition", "attachment; filename=" + filename);
BinaryWriter bw = new BinaryWriter(Response.OutputStream);
bw.Write(fileData);
bw.Close();
Response.ContentType = ReturnExtension(ext);
Response.End();
用于扩展的功能，使功能通用，以便您可以在整个项目中使用它，下面的功能是我从Code Project获得的，有些来源我现在不记得了，现在在我的项目中使用它，它非常适合我在任何浏览器中
Function used to get extension , make a function as common so u can use it in youer entire project , the below function i got it from Code Project some source i dont remember it now , and i am using it in my project it works perfectly for me in any browser
public string ReturnExtension(string fileExtension)
{
switch (fileExtension)
{
case ".htm":
case ".html":
case ".log":
return "text/HTML";
case ".txt":
return "text/plain";
case ".doc":
return "application/ms-word";
case ".tiff":
case ".tif":
return "image/tiff";
case ".asf":
return "video/x-ms-asf";
case ".avi":
return "video/avi";
case ".zip":
return "application/zip";
case ".xls":
case ".csv":
return "application/vnd.ms-excel";
case ".gif":
return "image/gif";
case ".jpg":
case "jpeg":
return "image/jpeg";
case ".bmp":
return "image/bmp";
case ".wav":
return "audio/wav";
case ".mp3":
return "audio/mpeg3";
case ".mpg":
case "mpeg":
return "video/mpeg";
case ".rtf":
return "application/rtf";
case ".asp":
return "text/asp";
case ".pdf":
return "application/pdf";
case ".fdf":
return "application/vnd.fdf";
case ".ppt":
return "application/mspowerpoint";
case ".dwg":
return "image/vnd.dwg";
case ".msg":
return "application/msoutlook";
case ".xml":
case ".sdxl":
return "application/xml";
case ".xdp":
return "application/vnd.adobe.xdp+xml";
default:
return "application/octet-stream";
}
}
让我知道它有效
Let me know of it works
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