Binding WPF ComboBox to enum and hiding certain values

问题

I have a WPF combobox that is bound to an enum like this:

<Window.Resources>
    <local:EnumDescriptionConverter x:Key="enumDescriptionConverter"/>
    <ObjectDataProvider MethodName="GetValues" ObjectType="{x:Type sys:Enum}" x:Key="cityNamesDataProvider">
        <ObjectDataProvider.MethodParameters>
            <x:Type TypeName="local:MyModel+CityNamesEnum"/>
        </ObjectDataProvider.MethodParameters>
    </ObjectDataProvider>
</Window.Resources>

<ComboBox x:Name="cityNameComboBox" ItemsSource="{Binding Source={StaticResource cityNamesDataProvider}}" SelectionChanged="cityNameComboBox_SelectionChanged">
    <ComboBox.ItemTemplate>
        <DataTemplate>
            <TextBlock Text="{Binding Converter={StaticResource enumDescriptionConverter}}"/>
        </DataTemplate>
    </ComboBox.ItemTemplate>
</ComboBox>

The enum that I'm binding to has description attributes and looks like this:

public enum CityNamesEnum
{
    [Description("New York City")]
    NewYorkCity,
    [Description("Chicago")]
    Chicago,
    [Description("Los Angeles")]
    LosAngeles
}

I don't always want to display each enum value. Is it possible to toggle the visibility of one or more of the enum values? If these were ComboBoxItems, I think I could simply set the .Visibility property to hidden but since they're enum values, I'm not sure if this is possible. Does anyone know?

回答1:

Why not just create a normal C# method which does the filtering for you and then have the ObjectDataProvider point to that method instead

static method IEnumerable<CityNamesEnum> MyFilter() {
  yield return CityNames.NewYorkCity;
  yield return CityNames.Chicago;
}

XAML

<ObjectDataProvider 
   MethodName="MyFilter" 
   ObjectType="{x:Type local:TheType}" 
   x:Key="cityNamesDataProvider">
</ObjectDataProvider>

来源：https://stackoverflow.com/questions/20997898/binding-wpf-combobox-to-enum-and-hiding-certain-values

标签

wpf

binding

combobox

enums