Como habilitar o download para uma página ASP.NET
Aqui é como habilitar o download de arquivos do servidor de página aspx.
Arraste um Botão no webform (WebForm1:TWebForm1) e nomeie o próximo código para o evento Click.
procedure TWebForm1.Button1_Click(sender: System.Object; e: System.EventArgs) ;
var
FileToDownload : string;
begin
FileToDownload := c:\ServerTest.txt; //make sure this exists!!!
DownloadFile(FileToDownload,LocalTest.txt) ;
end;
Aqui é a DownloadFile funcionando (tenha certeza de que você acrescentou o namespace System.IO a uses).
procedure DownloadFile(const FilePath : String; const FileName : String =; const ContentType : String = ) ;
type
TStringArray = array of string;
var
DownloadFileName : string;
fi : FileInfo;
StartPos, FileSize, EndPos : System.Int64;
Range : string;
StartEnd : TStringArray;
begin
If Not System.IO.File.Exists(FilePath) Then Exit;
StartPos := 0;
fi := FileInfo.Create(FilePath) ;
FileSize := fi.Length;
EndPos := FileSize;
HttpContext.Current.Response.Clear() ;
HttpContext.Current.Response.ClearHeaders() ;
HttpContext.Current.Response.ClearContent() ;
Range := HttpContext.Current.Request.Headers[Range];
If Assigned(Range) AND (Range <> ) Then
Begin
StartEnd := Range.Substring(Range.LastIndexOf(=) + 1).Split([-]) ;
If Not (StartEnd[0] = ) Then
StartPos := Convert.ToInt64(StartEnd[0]) ;
End;
If (System.Array(StartEnd).GetUpperBound(0) >= 1) And (Not (StartEnd[1] = )) Then
EndPos := Convert.ToInt64(StartEnd[0])
Else
EndPos := FileSize - StartPos;
If EndPos > FileSize Then EndPos := FileSize - StartPos;
HttpContext.Current.Response.StatusCode := 206;
HttpContext.Current.Response.StatusDescription := Partial Content;
HttpContext.Current.Response.AppendHeader(Content-Range, bytes + StartPos.ToString + - + EndPos.ToString + / + FileSize.ToString) ;
If Not (ContentType = ) And (StartPos = 0) Then
Begin
HttpContext.Current.Response.ContentType := ContentType;
End;
If FileName = Then
DownloadFileName := fi.Name
else
DownloadFileName := FileName;
HttpContext.Current.Response.AppendHeader(Content-disposition, attachment; filename= + DownloadFileName) ;
HttpContext.Current.Response.WriteFile(FilePath, StartPos, EndPos) ;
HttpContext.Current.Response.&End;
End;
(*DownloadFile*)
