在xaml中访问DisplayName

Question

如何在XAML中访问DisplayName的值？

我有:

public class ViewModel {
  [DisplayName("My simple property")]
  public string Property {
    get { return "property";}
  }
}

XAML:

<TextBlock Text="{Binding ??Property.DisplayName??}"/>
<TextBlock Text="{Binding Property}"/>

有没有办法以这种或类似的方式绑定DisplayName？最好的想法是使用此DisplayName作为Resources的关键,并从Resources中提供一些内容.

Answer 1

我会使用标记扩展名:

public class DisplayNameExtension : MarkupExtension
{
    public Type Type { get; set; }

    public string PropertyName { get; set; }

    public DisplayNameExtension() { }
    public DisplayNameExtension(string propertyName)
    {
        PropertyName = propertyName;
    }

    public override object ProvideValue(IServiceProvider serviceProvider)
    {
        // (This code has zero tolerance)
        var prop = Type.GetProperty(PropertyName);
        var attributes = prop.GetCustomAttributes(typeof(DisplayNameAttribute), false);
        return (attributes[0] as DisplayNameAttribute).DisplayName;
    }
}

用法示例:

<TextBlock Text="{m:DisplayName TestInt, Type=local:MainWindow}"/>

public partial class MainWindow : Window
{
   [DisplayName("Awesome Int")]
   public int TestInt { get; set; }
   //...
}

Answer 2

不确定这会扩展得多好,但您可以使用转换器来获取您的DisplayName.转换器看起来像:

public class DisplayNameConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        PropertyInfo propInfo = value.GetType().GetProperty(parameter.ToString());
        var attrib = propInfo.GetCustomAttributes(typeof(System.ComponentModel.DisplayNameAttribute), false);

        if (attrib.Count() > 0)
        {
            return ((System.ComponentModel.DisplayNameAttribute)attrib.First()).DisplayName;
        }

        return String.Empty;
    }

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

然后你在XAML中的绑定看起来像:

Text="{Binding Mode=OneWay, Converter={StaticResource ResourceKey=myConverter}, ConverterParameter=MyPropertyName}"