Analysis of ASP. NET File Download Functions

What is the usage of ASP. NET File Download functions? Add the following code to your Page_Load:

 
 

  
  
Page. Response. Clear ();
  
  
BoolSuccess = ResponseFile (Page. Request, Page. Response,"Target file name",@"Source file path", 1024000 );
  
  
 If(! Success)
  
  
Response. Write ("An error occurred while downloading the file! ");
  
  
Page. Response. End ();
 
 

The function code for downloading ASP. NET files is:

 
 

  
  
Public Static BoolResponseFile (HttpRequest _ Request, HttpResponse _ Response, string _ fileName, string _ fullPath,Long_ Speed)
  
  
{
  
  
Try 
  
  
{
  
  
FileStream myFile =NewFileStream (_ fullPath, FileMode. Open, FileAccess. Read, FileShare. ReadWrite );
  
  
BinaryReader br =NewBinaryReader (myFile );
  
  
Try 
  
  
{
  
  
_ Response. AddHeader ("Accept-Ranges","Bytes");
  
  
_ Response. Buffer =False;
  
  
LongFileLength = myFile. Length;
  
  
LongStartBytes = 0;
  
  

  
  
DoublePack = 10240;// 10 K bytes 
  
  
// Int sleep = 200; // 5 times per second, that is, 5*10 K bytes per second 
  
  
IntSleep = (Int) Math. Floor (1000 * pack/_ speed) + 1;
  
  
If(_ Request. Headers ["Range"]! = Null)
  
  
{
  
  
_ Response. StatusCode = 206;
  
  
String [] range = _ Request. Headers ["Range"]. Split (New Char[] {'=','-'});
  
  
StartBytes = Convert. ToInt64 (range [1]);
  
  
}
  
  
_ Response. AddHeader ("Content-Length", (FileLength-startBytes). ToString ());
  
  
If(StartBytes! = 0)
  
  
{
  
  
// Response. AddHeader ("Content-Range", string. Format ("bytes {0}-{1}/{2}", startBytes, fileLength-1, fileLength )); 
  
  
}
  
  
_ Response. AddHeader ("Connection","Keep-Alive");
  
  
_ Response. ContentType ="Application/octet-stream";
  
  
_ Response. AddHeader ("Content-Disposition","Attachment; filename ="+ HttpUtility. UrlEncode (_ fileName, System. Text. Encoding. UTF8 ));
  
  

  
  
Br. BaseStream. Seek (startBytes, SeekOrigin. Begin );
  
  
IntMaxCount = (Int) Math. Floor (fileLength-startBytes)/pack) + 1;
  
  
 
  
  
For(IntI = 0; I <maxCount; I ++)
  
  
{
  
  
If(_ Response. IsClientConnected)
  
  
{
  
  
_ Response. BinaryWrite (br. ReadBytes (Int. Parse (pack. ToString ())));
  
  
Thread. Sleep (sleep );
  
  
}
  
  
Else 
  
  
{
  
  
I = maxCount;
  
  
}
  
  
}
  
  
}
  
  
Catch 
  
  
{
  
  
Return False;
  
  
}
  
  
Finally
  
  
{
  
  
Br. Close ();
  
  
 
  
  
MyFile. Close ();
  
  
}
  
  
}
  
  
Catch 
  
  
{
  
  
Return False;
  
  
}
  
  
Return True;
  
  
}
 
 

In this way, the open/save window can pop up no matter what format the file is downloaded.

The basic information about ASP. NET File Download functions is introduced here. I hope to help you understand ASP. NET File Download functions.

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