我有以下枚举:
public enum ViewMode
{
[Display(Name = "Neu")]
New,
[Display(Name = "Bearbeiten")]
Edit,
[Display(Name = "Suchen")]
Search
}
我正在使用xaml和数据绑定在我的窗口中显示枚举:
<Label Content="{Binding CurrentViewModel.ViewMode}" Grid.Column="2" VerticalContentAlignment="Bottom" Height="43" HorizontalContentAlignment="Right"/>
但这不会显示显示名称属性。我该怎么做?
在我的viewModel中,我可以通过使用扩展方法获得显示名称属性:
public static class EnumHelper
{
/// <summary>
/// Gets an attribute on an enum field value
/// </summary>
/// <typeparam name="T">The type of the attribute you want to retrieve</typeparam>
/// <param name="enumVal">The enum value</param>
/// <returns>The attribute of type T that exists on the enum value</returns>
public static T GetAttributeOfType<T>(this Enum enumVal) where T : System.Attribute
{
var type = enumVal.GetType();
var memInfo = type.GetMember(enumVal.ToString());
var attributes = memInfo[0].GetCustomAttributes(typeof(T), false);
return (attributes.Length > 0) ? (T)attributes[0] : null;
}
}
用法为string desc = myEnumVariable.GetAttributeOfType<DescriptionAttribute>().Description;
。但是,这在XAML中没有帮助。
创建一个实现System.Windows.Data.IValueConverter
接口的类,并将其指定为绑定的转换器。或者,为了更容易使用,您可以创建一个实现System.Windows.Markup.MarkupExtension
的"提供者"类(实际上,只需一个类就可以同时实现这两个)。您的最终结果可能类似于以下示例:
public class MyConverter : MarkupExtension, IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
return ((Enum)value).GetAttributeOfType<DisplayAttribute>().Name;
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
throw new NotSupportedException();
}
public override object ProvideValue(IServiceProvider serviceProvider)
{
return this;
}
}
然后在XAML中:
<Label Content="{Binding CurrentViewModel.ViewMode, Converter={local:MyConverter}}" Grid.Column="2" VerticalContentAlignment="Bottom" Height="43" HorizontalContentAlignment="Right"/>