WPF OpenFileDialog in VB.NET

This article shows how to use an OpenFileDialog control in WPF and VB.NET to browse files.
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The OpenFileDialog is used to browse files on a machine.

The OpenFileDialog class defined in Microsoft.Win32.OpenFileDialog namespace represents an OpenFileDialog control in WPF.


Let's add a TextBox and a Button control to a XAML page. The window looks like this.



When you click the Browse button, we will browse text files and set the TextBox.Text to the selected file name.


<TextBox Height="32" HorizontalAlignment="Left" Margin="6,10,0,0" Name="FileNameTextBox"

                 VerticalAlignment="Top" Width="393" />

        <Button Content="Browse" Height="32" HorizontalAlignment="Left" Margin="405,10,0,0"

                Name="button1" VerticalAlignment="Top" Width="88" Click="button1_Click" />


The code listed in Listing 1 creates an OpenFileDialog, set its default extension and filter properties and calls ShowDialog method that displays the dialog. Once the OpenFileDialog is displayed, you can use it to browse files. Once file is selected, the FileName property of the OpenFileDialog is set to the selected file name. This code sets the selected file name as a TextBox.Text property.

    ' Create OpenFileDialog
    Dim dlg As New Microsoft.Win32.OpenFileDialog()

    ' Set filter for file extension and default file extension
dlg.DefaultExt = ".txt"
dlg.Filter = "Text documents (.txt)|*.txt"

    ' Display OpenFileDialog by calling ShowDialog method
    Dim result As Nullable(Of Boolean) = dlg.ShowDialog()
    ' Get the selected file name and display in a TextBox
If result = True Then
    ' Open document
    Dim filename As String = dlg.FileName
    FileNameTextBox.Text = filename
End If


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