WPF绑定枚举并且显示特性文本

一、文件结构

 

二、文件内容

FlattenMethodEnum.cs

     public enum FlattenMethodEnum
    {
        [Description("单点")]
        SinglePoint = 0,
        [Description("平均")]
        Average = 1,
    }
}

EnumBindingSourceExtension.cs

using System.Windows.Markup;
using System.Diagnostics.CodeAnalysis;

namespace Test.Helper
{
    class EnumBindingSourceExtension : MarkupExtension
    {
        private Type? _enumType;

        public Type? EnumType
        {
            get => _enumType;
            set
            {
                if (value != _enumType)
                {
                    if (value != null)
                    {
                        Type enumType = Nullable.GetUnderlyingType(value) ?? value;
                        if (!enumType.IsEnum)
                            throw new ArgumentException("Type must be for an Enum.");
                    }

                    _enumType = value;
                }
            }
        }

        public EnumBindingSourceExtension() { }

        public EnumBindingSourceExtension(Type enumType)
        {
            EnumType = enumType;
        }

        public override object ProvideValue(IServiceProvider serviceProvider)
        {
            if (_enumType == null)
                throw new InvalidOperationException("The EnumType must be specified.");

            var actualEnumType = Nullable.GetUnderlyingType(_enumType) ?? _enumType;
            var enumValues = System.Enum.GetValues(actualEnumType);

            if (actualEnumType == _enumType)
                return enumValues;

            var tempArray = Array.CreateInstance(actualEnumType, enumValues.Length + 1);
            enumValues.CopyTo(tempArray, 1);
            return tempArray;
        }
    }
}

EnumDescriptionConverter.cs

using System.Windows.Data;
using System.ComponentModel;
using System.Globalization;
using System.Windows;

namespace Test.Helper
{
     class EnumDescriptionConverter:IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value == null)
                return DependencyProperty.UnsetValue;

            return GetEnumDescription(value);
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return string.Empty;
        }

        private string GetEnumDescription(object enumObj)
        {
            var fi = enumObj.GetType().GetField(enumObj.ToString());

            DescriptionAttribute[] attributes = (DescriptionAttribute[])fi.GetCustomAttributes(typeof(DescriptionAttribute), false);

            if (attributes != null && attributes.Length > 0)
                return attributes[0].Description;
            else
                return enumObj.ToString();
        }
    }
}

三、使用

1、在View中引入命名空间

xmlns:enum="clr-namespace:Test.Enum"
xmlns:helper="clr-namespace:Test.Helper"  

2、引入资源； Tip：注意UserControl还是Window等

<UserControl.Resources>
    <helper:EnumBindingSource x:Key="enumDataSource" EnumType="{x:Type enum:SampleTypeEnum}"/>
    <helper:EnumDescriptionConverter x:Key="enumDescriptionConverter"/>
</UserControl.Resources>

3、ViewModel (使用了CommunityToolkit.MVVM包)

[ObservableProperty]
private SampleTypeEnum sampleType;

4、xaml

<ComboBox Width="80" Height="20"
          ItemsSource="{Binding Source={StaticResource enumDataSource}}" 
          SelectedItem="{Binding SampleType}"> <!-- 绑定枚举 -- >
    <ComboBox.ItemTemplate> <!-- 显示特性 -->
        <DataTemplate>
            <TextBlock Text="{Binding Converter={StaticResource enumDescriptionConverter}}"/>
        </DataTemplate>
    </ComboBox.ItemTemplate>
</ComboBox>