DataGridView populates only first row

[Sonhospa]

Hi, I hope you all had a merry Christmas and nice holidays with your beloved ones! :rose: I try to retrieve data from text files and show them in a Datagrieview control. Each of the files is represented in an instance of "SoundConfigFile", which are collected in a generic List(of SoundConfigFile). The problem is: Only one row (containing the data collected from the first file) shows up in the Datagridview!?! In the forms constructor, I set

    dgvList.AutoGenerateColumns = True
    dgvList.DataBindings.DefaultDataSourceUpdateMode = DataSourceUpdateMode.OnValidation

. The longer task of extracting the required data from files is handled in a separate thread:

Private Sub ThreadFunction()

    Try
        SoundConfigFiles = New List(Of SoundConfigFile)
        Dim dirs As String() = Directory.GetFiles(My.Settings.FSACDir, "sound.cfg", SearchOption.AllDirectories)
        Dim max As Integer = dirs.Count()
        Dim done As Integer = 0
        Dim percent As Integer = 0
        Dim msg As String = String.Empty

        For Each configfile As String In dirs
            SoundConfigFiles.Add(New SoundConfigFile(Me, configfile))
            done += 1
            percent = CInt(done / max \* 100)
            msg = String.Format("{0} finished ({1}%)", configfile, percent)
            'update the UI thread
            UpdateForm(configfile, percent, msg)
        Next
    Catch ex As Exception
    End Try
End Sub 'ThreadFunction

The UI thread is then updated in

Public Sub UpdateForm(ByVal myItem As String, ByVal percent As Integer, ByVal msg As String)

    If Me.InvokeRequired Then
        Dim d As UpdateDelegate = AddressOf UpdateForm
        Me.Invoke(d, {myItem, percent, msg})
    Else
        Me.dgvList.DataSource = SoundConfigFiles
        Me.dgvList.Refresh()
        Me.ProgressBar1.Value = percent
        Me.myLabel.Text = msg
        Me.lblFinalMessage.Text = String.Format("{0} instances still open.", \_
                                       SoundConfigFile.instances)

    End If
End Sub

I tried to find relevant information for hours now, but I can't get it to work. Does anyone of you have a good advice or can tell me what I'm doing wrong here? :confused: Thank you, Mick

[Lost User]

Let's see; we add item to a collection, set the datasource to the collection, get the next item. You stated that you only saw the first one. Try setting the datasource to "null" before assigning the collection :)

Bastard Programmer from Hell :suss: If you can't read my code, try converting it here[^]

[Sonhospa]

This works :-D Thank you, Eddy! :cool: But it's not enough to set the datasource to "Nothing" after startup (same result: only first row seen). I have do that (and afterwards assign the collection again) within the "UpdateUI" Sub. Doesn't that slow down the application massively? Is that a bug?

[Lost User]

Sonhospa wrote:

Doesn't that slow down the application massively?

You're right, it does. It'd be recommended not to set the datasource until the list is completely populated. If you want "smoother" loading using the DataGridView, you could implement a virtual mode[^] :)

Bastard Programmer from Hell :suss: If you can't read my code, try converting it here[^]