Upload Image and Insert New Record

ken71683 · June 6th, 2011, 11:24 AM

Okay, in ListView's Insert Item Template I have managed to get it to insert only the information that I need - now I want to incorporate a file upload in the same Insert Item Template - basically want to upload a file and add that files information plus the new record information to the database in one click - getting this error...Object reference not set to an instance of an object.

I am tinkering around with the code but I can upload what I have if that would help.

Any assistance is greatly appreciated. This is so confusing.

Imar · June 6th, 2011, 04:52 PM

Hi there,

That error is really common and can be caused by many different factors. So, it's impossible to say what's going on without seeing you code.

Cheers,

Imar

ken71683 · June 7th, 2011, 07:42 AM

Code:

        <InsertItemTemplate>

            Click Browse to Upload File.<br />

            <asp:FileUpload ID="FileField" runat="server" size="60" /><br />
            <asp:Label runat="server" ID="FileWrite" />

            Title:
            <asp:TextBox ID="FileNameTextBox" runat="server" Text='<%# Bind("FileName") %>' /><br />
            
            Description:
            <asp:TextBox ID="DescriptionTextBox" runat="server" Text='<%# Bind("Description") %>' />


            <asp:Button ID="InsertButton" runat="server" CommandName="Insert" Text="Insert" />
            <asp:Button ID="CancelButton" runat="server" CommandName="Cancel" Text="Clear" />
            
        </InsertItemTemplate>

Code:

Protected Sub ListView1_ItemInserting(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.ListViewInsertEventArgs) Handles ListView1.ItemInserting


            Dim FileField As FileUpload = CType(ListView1.FindControl("FileField"), FileUpload)
            Dim virtualFolder As String = "~/Documents/"
            Dim physicalFolder As String = Server.MapPath(virtualFolder)
            Dim fileName As String = Guid.NewGuid().ToString()
            Dim extension As String = System.IO.Path.GetExtension(FileField.FileName)

            'Upload file:
            FileField.SaveAs(System.IO.Path.Combine(physicalFolder, fileName + extension))
            'Assign url to db:
            e.Values("DocumentURL") = virtualFolder + fileName + extension

            e.Values("UploadDate") = DateTime.Now
            e.Values("UserName") = Membership.GetUser().UserName
            e.Values("DownloadCount") = 0
            e.Values("FileType") = "DOC"


  End Sub

ken71683 · June 7th, 2011, 02:17 PM

I've been reading some forums and it is saying that the fileUpload field is getting dumped in the insert item template because of postback? I'm not entirely clear of what that means - I can upload any file by clicking a standard button control but when I add the fileupload option to the item insert template it fails.

I want the upload file/browse box followed by a Title, Description textbox then "Insert" to be clicked - when I do that it fails and the Upload File box is dumped.

I'm thinking I'm really close to knocking this out - I'm just missing something somewhere.

Imar · June 7th, 2011, 03:28 PM

Did you try FindControl on the InsertItem? E.g. ListView1.InsertItem.FindControl?

And do you what line causes the null reference exception?

Imar

ken71683 · June 7th, 2011, 03:37 PM

I think I'm putting everything in correctly I've read a few other forums that say postback is making it lose the fileUpload capability...

Code:

Protected Sub ListView1_ItemInserting(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.ListViewInsertEventArgs) Handles ListView1.ItemInserting

Dim FileField As FileUpload = ListView1.FindControl("FileField")


            Dim savePath As String = "C:\Inetpub\wwwroot\DotNet_Projects\MyClarkTireResources\Management\Documents\"

            If (FileField.HasFile) Then


                Dim fileName As String = FileField.FileName

                savePath += fileName

                FileField.SaveAs(savePath)

                Label1.Text = "Your File Was uploaded as " + fileName

                Dim virtualFolder As String = "~/Documents/"
                Dim physicalFolder As String = Server.MapPath(virtualFolder)
                Dim fileNameExt As String = Guid.NewGuid().ToString()
                Dim extension As String = System.IO.Path.GetExtension(FileField.FileName)

                'Upload(file)
                FileField.SaveAs(System.IO.Path.Combine(physicalFolder, fileNameExt + extension))

                'Assign url to db:
                e.Values("DocumentURL") = virtualFolder + fileNameExt + extension

                e.Values("DocumentSize") = 100
                e.Values("UploadDate") = DateTime.Now
                e.Values("UserName") = Membership.GetUser().UserName
                e.Values("DownloadCount") = 0
                e.Values("FileType") = "DOC"


            Else

                Label1.Text = "Trash"

           End If
  End Sub

Code:

        <InsertItemTemplate>

            <div id="InfoContainer">
            Click Browse to Upload File.<br />
                <asp:FileUpload ID="FileField" runat="server" size="60" /><br />
            </div>

            <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>

            Title:
            <asp:TextBox ID="FileNameTextBox" runat="server" Text='<%# Bind("Title") %>' /><br />
            
            Description:
            <asp:TextBox ID="DescriptionTextBox" runat="server" Text='<%# Bind("Description") %>' />


            <asp:Button ID="InsertButton" runat="server" CommandName="Insert" Text="Insert" />
            <asp:Button ID="CancelButton" runat="server" CommandName="Cancel" Text="Clear" />
  
        </InsertItemTemplate>

Error:

Object reference not set to an instance of an object.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error:

Line 68: 'Dim UploadDetails As Label
Line 69:
Line 70: FileName.InnerHtml = FileField.PostedFile.FileName <==HERE IS WHERE IT IS RED ################
Line 71: FileContent.InnerHtml = FileField.PostedFile.ContentType
Line 72: FileSize.InnerHtml = FileField.PostedFile.ContentLength

Imar · June 7th, 2011, 04:26 PM

You can't upload a file like this without a postback so it should work. Maybe you are referring to issues with an UpdatePanel?

Did you see my previous post? And what happens when you debug the app? Is the control null, or the PostedFile property?

Imar