Bind UWP ComboBox ItemsSource to Enum

问题

It's possible to use the ObjectDataProvider in a WPF application to bind an enum's string values to a ComboBox's ItemsSource, as evidenced in this question.

However, when using a similar snippet in a UWP application, the ff. error message is displayed:

"ObjectDataProvider is not supported in a Windows Universal project."

Is there a simple alternative to do this in UWP?

回答1:

Below is a working example from one of my prototypes.

ENUM

public enum GetDetails
{
    test1,
    test2,
    test3,
    test4,
    test5
}

ItemsSource

var _enumval = Enum.GetValues(typeof(GetDetails)).Cast<GetDetails>();
cmbData.ItemsSource = _enumval.ToList();

This will bind combobox to Enum Values.

回答2:

If you try to set your SelectedItem via xaml and Bindings, make sure that you set the ItemsSource first!

Example:

<ComboBox ItemsSource="{Binding ...}" SelectedItem="{Binding ...}"/>

回答3:

ComboBox with ItemSource to Enum, also with SelectedItem. And with option to replace Enum's name with custom string (e.g. translation). Respecting MVVM pattern.

Enum:

public enum ChannelMark
{
   Undefinned,Left, Right,Front, Back
}

ViewModel

private ChannelMark _ChannelMark = ChannelMark.Undefinned;

public ChannelMark ChannelMark
{
    get => _ChannelMark;
    set => Set(ref _ChannelMark, value);
}

private List<int> _ChannelMarksInts = Enum.GetValues(typeof(ChannelMark)).Cast<ChannelMark>().Cast<int>().ToList();

public List<int> ChannelMarksInts
{
    get => _ChannelMarksInts;
    set => Set(ref _ChannelMarksInts, value);
}

XAML

<ComboBox ItemsSource="{x:Bind ViewModel.ChannelMarksInts}"  SelectedItem="{x:Bind ViewModel.ChannelMark, Converter={StaticResource ChannelMarkToIntConverter}, Mode=TwoWay}">
    <ComboBox.ItemTemplate>
        <DataTemplate>
            <TextBlock Text="{Binding  Converter={StaticResource IntToChannelMarkConverter}}"/>
        </DataTemplate>
    </ComboBox.ItemTemplate>
</ComboBox>

Converters:

switch ((ChannelMark)value)
{
    case ChannelMark.Undefinned:
        return "Undefinned mark";
    case ChannelMark.Left:
        //translation
        return Windows.ApplicationModel.Resources.ResourceLoader.GetForCurrentView().GetString("ChannelMarkEnumLeft");
    case ChannelMark.Right:
        return "Right Channel";
    case ChannelMark.Front:
        return "Front Channel";
    case ChannelMark.Back:
        return "Back Channel";
    default:
        throw new NotImplementedException();
}



public class IntToChannelMarkConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, string language) => ((ChannelMark)value).ToString();
    public object ConvertBack(object value, Type targetType, object parameter, string language) => throw new NotImplementedException();
}

来源：https://stackoverflow.com/questions/39209844/bind-uwp-combobox-itemssource-to-enum

标签

combobox

enums

uwp

uwp-xaml