C# - Force Download Of A File From Memory With Support For Downloading More Than Once?
Feb 20, 2011
I am dynamically generating a file from server based on user input. I need to provide a download button which, upon clicking, downloads a file to the user's file system. Also, the user might click the same button twice, upon which the file should download again.The dynamic generation of file rules out the HttpResponse.TransmitFile() option, which suports mutliple download.Almost every other option I have come across needs Response.End() to be invoked, which prevents a second download.How do I satisfy the 'multiple download" requirement?Read up on Virtual Path providers, which might enable me to use TransmitFile(), but that looks like an overkill for such a simple requirement.
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Code:
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<%@ Page language="vb" runat="server" explicit="true" strict="true" %><script language="vb" runat="server">Sub Page_Load(Sender As Object, E As EventArgs)Dim strRequest As String = Request.QueryString("file") '-- if something was passed to the file querystringIf strRequest <> "" Then 'get absolute path of the fileDim path As String = Server.MapPath(strRequest) 'get file object as FileInfoDim file As System.IO.FileInfo = New System.IO.FileInfo(path) '-- if the file exists on the serverIf file.Exists Then 'set appropriate headersResponse.Clear()Response.AddHeader("Content-Disposition", "attachment; filename=" & file.Name)Response.AddHeader("Content-Length", file.Length.ToString())Response.ContentType = "application/octet-stream"Response.WriteFile(file.FullName)Response.End 'if file does not existElseResponse.Write("This file does not exist.")End If 'nothing in the URL as HTTP GETElseResponse.Write("Please provide a file to download.")End IfEnd Sub</script>
Source: http://www.xefteri.com/articles/show.cfm?id=8
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