wpf 绑定到 xaml 中枚举的显示名称属性
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Binding to display name attribute of enum in xaml
提问by mosquito87
I have the following enum:
我有以下枚举：
public enum ViewMode
{
[Display(Name = "Neu")]
New,
[Display(Name = "Bearbeiten")]
Edit,
[Display(Name = "Suchen")]
Search
}
I'm using xaml and databinding to show the enum in my window:
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"/>
But this doesn't show the display name attribute. How can I do so?
但这不会显示显示名称属性。我怎么能这样做？
In my viewModel I can get the display name attribute by using an extension method:
在我的 viewModel 中，我可以使用扩展方法获取显示名称属性：
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;
}
}
Usage is string desc = myEnumVariable.GetAttributeOfType<DescriptionAttribute>().Description;.
However, this doesn't help in XAML.
用法是string desc = myEnumVariable.GetAttributeOfType<DescriptionAttribute>().Description;。但是，这在 XAML 中没有帮助。
回答by Grx70
Create a class implementing the System.Windows.Data.IValueConverterinterface and specify it as the binding's converter. Optionally, for easier usage, you can create a "provider" class implementing System.Windows.Markup.MarkupExtension(actually you can do both with just one class). Your end result could resemble this example:
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“提供者”类实现System.Windows.Markup.MarkupExtension（实际上您可以只用一个类来实现这两个）。您的最终结果可能类似于此示例：
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;
}
}
And then in XAML:
然后在 XAML 中：
<Label Content="{Binding CurrentViewModel.ViewMode, Converter={local:MyConverter}}" Grid.Column="2" VerticalContentAlignment="Bottom" Height="43" HorizontalContentAlignment="Right"/>
