显示枚举说明而不是名称

Question

我有这样的数据绑定设置:

ItemsSource="{Binding Source={my:Enumeration {x:Type credit:OccupationCategory}}}"
                      DisplayMemberPath="Description"
                      SelectedValue="{Binding EmplType}"
                      SelectedValuePath="Value"/>

它工作得很好.对更大的软件设计进行更改我不能再生成任何生成INotifyPropertyChanged事件的内容,因此数据绑定类型不起作用.相反,我手动设置selectedIndex并从代码构建选项,如下所示:

ItemsSource="{Binding Source={StaticResource ResidenceOwnershipType}}"/>

哪些参考

<UserControl.Resources>
    <ObjectDataProvider x:Key="ResidenceOwnershipType" MethodName="GetValues" ObjectType="{x:Type System:Enum}" >
        <ObjectDataProvider.MethodParameters>
            <x:Type TypeName="credit:ResidenceOwnershipType" />
        </ObjectDataProvider.MethodParameters>
    </ObjectDataProvider>
</UserControl.Resources>

就列表选项的构建和所有数据的链接而言,这是有效的,但我无法让组合框在枚举中显示描述标记而不是实际文本.

我尝试过这样的事情:

DisplayMemberPath="Description"

但这不正确.我该怎么做呢？

编辑:

我的枚举:

[DataContract]
public enum ResidenceOwnershipType
{
    [Description("")]
    None = 0,
    [Description("Owns Home Outright")]
    OwnsHomeOutright = 1,
    [Description("Buying Home")]
    BuyingHome = 2,
    [Description("Renting/Leasing")] //Weird order here reflects RouteOne website
    RentingLeasing = 4,
    [Description("Living w/Relatives")]
    LivingWithRelatives = 3,
    [Description("Owns/Buying Mobile Home")]
    MobileHome = 5,
    [Description("Unknown")]
    Unknown = 6
}

Answer 1

如果你保留这个,ItemsSource你将不得不定义一个自定义,ItemTemplate因为DisplayMemberPath它只是一个你将无法检索描述的路径.

至于什么模板应该是这样的:你可以绑定TextBlock到枚举值(当前DataContext)和管道通过该ValueConverter使用Binding.Converter.该代码将只是一些反映检索Description(GetType,GetCustomAttributes等等)

替代方案是一种自定义方法,可以立即返回可用的集合(并在其中使用ObjectDataProvider)或自定义标记扩展,它可以执行相同的操作.

方法示例如果我们谈论的是ComponentModel.DescriptionAttribute:

public static class EnumUtility
{
    // Might want to return a named type, this is a lazy example (which does work though)
    public static object[] GetValuesAndDescriptions(Type enumType)
    {
        var values = Enum.GetValues(enumType).Cast<object>();
        var valuesAndDescriptions = from value in values
                                    select new
                                        {
                                            Value = value,
                                            Description = value.GetType()
                                                .GetMember(value.ToString())[0]
                                                .GetCustomAttributes(true)
                                                .OfType<DescriptionAttribute>()
                                                .First()
                                                .Description
                                        };
        return valuesAndDescriptions.ToArray();
    }
}

<ObjectDataProvider x:Key="Data" MethodName="GetValuesAndDescriptions"
                    ObjectType="local:EnumUtility">
    <ObjectDataProvider.MethodParameters>
        <x:TypeExtension TypeName="local:TestEnum" />
    </ObjectDataProvider.MethodParameters>
</ObjectDataProvider>

<ListBox ItemsSource="{Binding Source={StaticResource Data}}"
         DisplayMemberPath="Description"
         SelectedValuePath="Value"/>