Question

This question is a follow-up to one I asked and got answered here: How to display XPS document using a selected combobox item

I’ve created a WPF app using VB 2010. I set the comboboxitems via the XAML. However, I can’t seem to figure out how to set the value of each item to a file path.

The objective is for a user to be able to select an item from a drop-down list, then that selection opens an XPS file in the DocumentViewer. The code below was provided to me by COMPETENT_TECH (thanks) to read and display the value of the selected comboboxitem in the DocumentViewer.

The path to the files I want opened is C:\folder\file.xps

Private Sub Button4_Click(sender As System.Object, e As System.Windows.RoutedEventArgs) Handles Button4.Click

    Try
        Dim sFileName As String

        sFileName = DirectCast(ComboBox1.SelectedValue, String)
        If Not String.IsNullOrEmpty(sFileName) Then
            Dim theDocument As New System.Windows.Xps.Packaging.XpsDocument(sFileName, System.IO.FileAccess.Read)

            DocumentViewer1.Document = theDocument.GetFixedDocumentSequence()
        End If
    Catch ex As Exception
        MessageBox.Show("ERROR: " & ex.Message)
    End Try


End Sub

Thanks in advance for your assistance.

Update

Here’s the XAML I’m using:

<ComboBox Width="Auto" IsReadOnly="True" IsEditable="True" Name="ComboBox1" Height="Auto" Margin="0" Padding="1" Grid.Column="2"> 
  <ComboBoxItem>123456</ComboBoxItem> 
  <ComboBoxItem>123457</ComboBoxItem> 
  <ComboBoxItem>123458</ComboBoxItem> 
</ComboBox>

Answer 1

Depending on precisely how the xaml to load the combobox is specified, you will probably want to change this line:

Dim theDocument As New System.Windows.Xps.Packaging.XpsDocument(sFileName, System.IO.FileAccess.Read)

to:

Dim theDocument As New System.Windows.Xps.Packaging.XpsDocument(System.IO.Path.Combine("C:\folder", sFileName & ".xps"), System.IO.FileAccess.Read)

All that we do in the new code is combine the directory where the files are stored with the file name retrieved from the combobox.

Update

The correct way to retrieve the value from the combobox is:

If ComboBox1.SelectedValue IsNot Nothing Then
    sFileName = DirectCast(ComboBox1.SelectedValue, ComboBoxItem).Content.ToString()
End If