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Open different content type of files. vb.net

Posted on 2008-11-18
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Last Modified: 2013-12-17
I have the following:

Protected Sub GridViewAttachments_RowCommand(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewCommandEventArgs) Handles GridViewAttachments.RowCommand
        If e.CommandName = "Browse" Then

            Dim myConnection As New SqlConnection(ConfigurationManager.ConnectionStrings("ConnectionString").ConnectionString)

            Dim index As Integer = Convert.ToInt32(lblInterviewID.Text)
            Try

                Dim ds As New DataSet

                Dim da As SqlClient.SqlDataAdapter

                Dim arrContent As Byte()

                Dim dr As DataRow

                Dim strSql As String
               
                strSql = "Select * from [tbl_dotnet_attachments] Where [AttachmentID]='" + e.CommandArgument.ToString() + "'"

                Dim myCommand As New SqlCommand(strSql, myConnection)

                da = New SqlClient.SqlDataAdapter(strSql, myConnection)

                da.Fill(ds)

                dr = ds.Tables(0).Rows(0)

                arrContent = CType(dr.Item("ImageContent"), Byte())

                Dim filePath As String = dr.Item("Filename").ToString()

                Dim dotPosition As Integer = filePath.LastIndexOf(".")

                Dim filenameOnly As String = filePath.Substring(dotPosition + 1)

                Select Case filenameOnly
                    Case "zip"
                        Response.ContentType = "application/x-zip-compressed"
                    Case "pdf"
                        Response.ContentType = "application/pdf"
                    Case "csv"
                        Response.ContentType = "application/csv"
                    Case "doc"
                        Response.ContentType = "application/doc"
                    Case "docx"
                        Response.ContentType = "application/docx"
                    Case "xls"
                        Response.ContentType = "application/xls"
                    Case "xlsx"
                        Response.ContentType = "application/xlsx"
                    Case "png"
                        Response.ContentType = "application/png"
                    Case "gif"
                        Response.ContentType = "application/gif"
                    Case "jpg"
                        Response.ContentType = "application/jpg"
                    Case "csv"
                        Response.ContentType = "application/csv"
                    Case "txt"
                        Response.ContentType = "application/txt"
                End Select

                Response.BinaryWrite(arrContent)
                Response.Flush()
                Response.Close()



            Catch ex As Exception

         
            End Try



           
        End If

    End Sub

it fails when I try to write the binary content.
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Comment
Question by:mathieu_cupryk
2 Comments
 
LVL 2

Accepted Solution

by:
AshleighGreen earned 2000 total points
ID: 22990114
Hello,

There are a couple of bits of code I see missing in your example above:

I would try replacing;
Response.BinaryWrite(arrContent)
Response.Flush()
Response.Close()
with:
The content type can always be octet-stream from my experience. Consider giving that a go. The users system generally works out what sort of file it is based on the extension.

Response.AddHeader("Content-disposition", "attachment;filename=" & strFriendlyName) //Make sure to give a filename
Response.ContentType = "application/octet-stream"
Response.BinaryWrite(arrContent)
Response.End()

Response.AddHeader("Content-disposition", "attachment; filename=" + sGenName);
Response.BinaryWrite(arrContent)
Response.End()

Also, new microsoft formats (docx etc). It throws an exception with the above code, I forget what it is but have a feeling it's a thread exception. You need to catch and ignore this exception as it doesn't actually cause any issues to the file. Having any Response.Write or HTML generation in the exception will append that to the BinaryWrite which will corrupt the document you are sending so be sure not to do that.
0
 

Author Comment

by:mathieu_cupryk
ID: 22991886
i was missing Response.AddHeader("Content-disposition", "attachment;filename=" & strFriendlyName) //Make sure to
it is working.
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