ResourceDictionary 作为 ValueConverter 中的 ContentProperty

Question

要将枚举转换为图标，我使用这样的值转换器：

public class IconConverter : IValueConverter
{
    public ResourceDictionary Items { get; set; }

    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {

        string key = Enum.GetName(value.GetType(), value);
        return Items[key];

    }

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

我在 XAML 中使用它，如下所示：

<UserControl.Resources>
    <local:IconConverter x:Key="IconConverter">
        <ResourceDictionary Source="/Leister.WPFControls;component/ButtonStyles.xaml" />
    </local:IconConverter>
</UserControl.Resources>

当我启动应用程序时，一切正常，转换器转换值的名称，并通过其键从 ResourceDictionary 获取图标。但在我的设计器中，Visual Studio 2010 总是抱怨：

The object of type System.Windows.ResourceDictionary" can not be cast to type "Microsoft.Expression.DesignModel.DocumentModel.DocumentNode".
at Microsoft.Expression.DesignModel.Core.InstanceBuilderOperations.SetValue(Object target, IProperty propertyKey, Object value)
at Microsoft.Expression.DesignModel.InstanceBuilders.ClrObjectInstanceBuilder.ModifyValue(IInstanceBuilderContext context, ViewNode target, IProperty propertyKey, Object value, PropertyModification modification)
at Microsoft.Expression.DesignModel.InstanceBuilders.ClrObjectInstanceBuilder.UpdateProperty(IInstanceBuilderContext context, ViewNode viewNode, IProperty propertyKey, DocumentNode valueNode)

这太烦人了！有什么想法吗？是否有更简单的解决方案将枚举转换为 XAML 图标资源？

Answer 1

我知道已经晚了，但也许 ContentPropertyAttribute 会对设计者有所帮助：

[ContentProperty("Items")]
public class IconConverter : IValueConverter
{
    public ResourceDictionary Items { get; set; }

http://msdn.microsoft.com/en-us/library/system.windows.markup.contentpropertyattribute.aspx