Opening files from RadGrid

[Josue]

Hi Guys,

Hope you can help me with this.

I got a Grid with a GridTemplateColumn and other informational columns, and inside the GridTemplateColumn is a ImageButton that will execute a function that will open documents. Here is the code:

Public Sub OpenDocument(ByVal sAttachmentPath As String)

    Dim sAttachmentExt As String

    Response.Clear()

    Response.ClearHeaders()

    Response.ClearContent()

    sAttachmentExt = sAttachmentPath.Substring(sAttachmentPath.LastIndexOf(CChar(".")))

    Try

        Select Case sAttachmentExt

            Case ".doc"

                Response.ContentType = "application/msword"

            Case ".docx"

                Response.ContentType = "application/vnd.openxmlformats-officedocument.wordprocessingml.document"

            Case ".xls"

                Response.ContentType = "application/vnd.ms-excel"

            Case ".xlsx"

                Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"

            Case ".ppt"

                Response.ContentType = "application/vnd.ms-powerpoint"

            Case ".pptx"

                Response.ContentType = "application/vnd.openxmlformats-officedocument.presentationml.presentation"

            Case ".pdf"

                Response.ContentType = "application/pdf"

            Case ".html"

                Response.ContentType = "application/html"

            Case ".txt"

                Response.ContentType = "application/plain"

            Case ".zip"

                Response.ContentType = "application/zip"

            Case ".rar"

                Response.ContentType = "application/rar"

            Case ".gif"

                Response.ContentType = "application/gif"

            Case ".jpg"

                Response.ContentType = "application/jpeg"

            Case ".png"

                Response.ContentType = "application/png"

            Case ".swf"

                Response.ContentType = "application/x-shockwave-flash"

            Case ".mpeg"

                Response.ContentType = "application/mpeg"

            Case ".avi"

                Response.ContentType = "application/x-msvideo"

            Case Else

                Response.ContentType = "application/plain"

        End Select

 

        Response.AddHeader("Content-Disposition", "attachment;filename=" & sAttachmentPath)


        Dim sourcefile As FileStream = New FileStream(sAttachmentPath, FileMode.Open)

 

        Dim FileSize As Integer

        FileSize = sourcefile.Length

        Dim getContent() As Byte = New Byte(FileSize - 1) {}

 

        sourcefile.Read(getContent, 0, CInt(sourcefile.Length))

        sourcefile.Close()

        Response.BinaryWrite(getContent)

        Response.Flush()

 

    Catch ex As Exception

        Throw ex

    Finally

        Response.End()

    End Try

End Sub

All work fine for the first time. But as soon I do a sorting of columns or filtering or change page, the Response.End() gives me an error of "Unable to evaluate expression". As a postback is made it start working again. Also I used HttpContext.Current.ApplicationInstance.CompleteRequest instead of Response.End() to see if continue working, in this case the error is not given, but still doesn't open the document. I know this is not a error of yours, but maybe there's something I could set to the grid to let me do what i need. Please let me know if you need any other information.

Thanks,
Josue

[Veli]

Hello Josue,

Cannot see anything that RadGrid may be interfering with. Try a simplified process of writing the attachment to the response:

Response.Clear()
Response.ContentType = "application/octet-stream"
Response.AddHeader("content-disposition", "attachment; filename=" + sAttachmentPath)
Response.BinaryWrite(getContent)
Response.End()

This should stream any file type. Let me know if it makes any difference. You may need to send us something we can test locally if this issue persists.

Veli
the Telerik team