WPF绑定一个ListBox到一个枚举，显示描述属性 [英] WPF Binding a ListBox to an enum, displaying the Description Attribute

问题描述

是否有可能使用ObjectDataProvider的方法将列表框绑定到一个枚举，款式它在某种程度上显示说明attriibute？如果是的话怎么总会有去这样做...？

Is it possible to use the ObjectDataProvider method to bind a ListBox to an enum, and style it somehow to display the Description attriibute? If so how would one go about doing this...?

推荐答案

是的，这是可能的。这将做到这一点。假设我们有枚举

Yes, it is possible. This will do it. Say we have the enum

public enum MyEnum
{
    [Description("MyEnum1 Description")]
    MyEnum1,
    [Description("MyEnum2 Description")]
    MyEnum2,
    [Description("MyEnum3 Description")]
    MyEnum3
}

然后我们可以使用的ObjectDataProvider为

Then we can use the ObjectDataProvider as

xmlns:MyEnumerations="clr-namespace:MyEnumerations"

<ObjectDataProvider MethodName="GetValues"
                ObjectType="{x:Type sys:Enum}"
                x:Key="MyEnumValues">
    <ObjectDataProvider.MethodParameters>
        <x:Type TypeName="MyEnumerations:MyEnum" />
    </ObjectDataProvider.MethodParameters>
</ObjectDataProvider>

和为ListBox我们设置的ItemsSource为MyEnumValues​​和一个转换器适用于一个ItemTemplate。

And for the ListBox we set the ItemsSource to MyEnumValues and apply an ItemTemplate with a Converter.

<ListBox Name="c_myListBox" SelectedIndex="0" Margin="8"
        ItemsSource="{Binding Source={StaticResource MyEnumValues}}">
    <ListBox.ItemTemplate>
        <DataTemplate>
            <TextBlock Text="{Binding Converter={StaticResource EnumDescriptionConverter}}"/>
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

和转炉我们得到的信息，并将其返回

And in the converter we get the description and return it

public class EnumDescriptionConverter : IValueConverter
{
    private string GetEnumDescription(Enum enumObj)
    {
        FieldInfo fieldInfo = enumObj.GetType().GetField(enumObj.ToString());

        object[] attribArray = fieldInfo.GetCustomAttributes(false);

        if (attribArray.Length == 0)
        {
            return enumObj.ToString();
        }
        else
        {
            DescriptionAttribute attrib = attribArray[0] as DescriptionAttribute;
            return attrib.Description;
        }
    }

    object IValueConverter.Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        Enum myEnum = (Enum)value;
        string description = GetEnumDescription(myEnum);
        return description;
    }

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

该GetEnumDescription方法也许应该去别的地方，但你的想法：）

The GetEnumDescription method should probably go somewhere else but you get the idea :)

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