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Lets say you have a form designed that is being run by the installer class.In the form there is a browse button to open the FOLDER BROWSE dialog. If you just drag and drop a folderbrowser control and implement code to open the dialog using SHOWDIALOG method, a dialog will open up with no treeview for folder structure.

To resolve this issue implement the code to start a new thread with ApartmentState as STA (single-threaded ) and open the folder browser dialog using the thread.

[START CODE VB.NET]

    Private Sub btnBrowse_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnBrowse.Click
        txtFilePath.Text = getFilePath()
    End Sub

    '   Function to create a new thread
    Public Function getFilePath() As String
        Try
            Dim pathname As String = Nothing
            Dim FolderDlgThread As System.Threading.Thread = New System.Threading.Thread(AddressOf getFilePathThread)
            FolderDlgThread.ApartmentState = Threading.ApartmentState.STA
            FolderDlgThread.Start()
            FolderDlgThread.Join()
            pathname = dlgFolder.SelectedPath
            Return pathname
        Catch err As Exception
            MsgBox(err.Message)
            Return Nothing
        End Try
    End Function

    <STAThread()> _
    Public Sub getFilePathThread()
        Try
            Dim pathname As String = Nothing
            dlgFolder.Site = Nothing ' dlgFolder is the folder browser control name
            Dim stat As DialogResult = dlgFolder.ShowDialog()   ' open the folder browser dialog
            If stat = DialogResult.OK Then
                pathname = dlgFolder.SelectedPath
            End If
        Catch err As Exception
            MsgBox(err.Message)
        End Try
    End Sub

[END CODE VB.NET]

Related Tags:
VB.NET

Author: Amrita Dash

VB.NET

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