RadCombobox属性在GotFocus和LostFocus之间失去价值

时间:2017-02-16 21:48:52

标签: wpf telerik radcombobox

我有一个radcombobox,其属性在GotFocus和LostFocus事件之间的某处丢失了它的值。

XAML:

<telerik:RadComboBox x:Name="cboWoodSpecies" 
    FontSize="16"  Margin="0,4,0,0" Background="#F6F8FA" BorderBrush="#D7D8DD" 
    ItemsSource="{Binding}" Text="{Binding woodSpecies, Mode=TwoWay}" 
    telerik:TextSearch.TextPath="WoodSpecies" 
    IsEditable="True" IsReadOnly="True" TabIndex="0"
    Style="{DynamicResource RadComboBoxStyle3}" >

GotFocus事件:

Private Sub cboWoodSpecies_GotFocus(sender As Object, e As RoutedEventArgs) Handles cboWoodSpecies.GotFocus

    BindComboBoxes.WoodSpecies(cboWoodSpecies)  'bind cbo to data


    If thisOrder.woodSpecies <> String.Empty Then   'Property OK here!!
        DisplayWoodSpeciesImage()
    End If
End Sub

DisplayWoodSpeciesImage读取属性的值,但不会将其重置为Nothing。

引发LostFocus:

Private Sub cboWoodSpecies_LostFocus(sender As Object, e As RoutedEventArgs) Handles cboWoodSpecies.LostFocus

    If thisOrder.woodSpecies <> String.Empty Then   'Property = Nothing.  Why?!?!
        'do stuff
    End If

End Sub

我认为它与组合框本身有关。从组合中选择新项目不会导致问题。它正在填充导致问题的现有数据的组合。我必须重新选择该项以绕过错误。

话虽如此,有没有办法刷新组合框,以便它认为该项目已被再次选中?是否需要设置SelectedItem?

感谢您提供任何帮助或建议。

1 个答案:

答案 0 :(得分:2)

尝试将SelectedValuePath的{​​{1}}设置为&#34; WoodSpecies&#34;并将ComboBox(而不是SelectedValue属性)绑定到&#34; woodSpecies&#34;:

Text