Referencing enum defined in a class from within XAML

In Expression Blend 4 (Silverlight project) I have a UserControl to which I have added a CLR property. This property is an enum type, which is defined within the UC. I have attached a ChangePropertyAction behaviour to an instance of the UC. However, the XAML parser gives the following error (among others):

'+' is not valid in a name

This is because the following XAML (snippet) has been generated:

<local:SomeControl Margin="155,113,317,0" d:LayoutOverrides="Width, Height">
  <i:Interaction.Triggers>
    <i:EventTrigger EventName="MouseLeftButtonDown">
      <ei:ChangePropertyAction PropertyName="MyProp">
        <ei:ChangePropertyAction.Value>
          <local:SomeControl+MyEnum>Second</local:SomeControl+MyEnum> <----- Error on this line caused by the '+' 
        </ei:ChangePropertyAction.Value>
      </ei:ChangePropertyAction>
    </i:EventTrigger>
  </i:Interaction.Triggers>
</local:SomeControl>

The code behind:

public partial class SomeControl : UserControl
{
    public SomeControl()
    {
        // Required to initialize variables
        InitializeComponent();
    }

    public MyEnum MyProp
    {
        get; set;
    }

    开发者_运维问答public enum MyEnum
    {
        First,
        Second,
        Third
    }
}

A simple workround is to "promote" the enum out from within the class (eg SomeControl_MyEnum), but is there a cleaner solution?

Using a nested type name in Xaml is not supported. You can still specify the value of the property without referring to the type name. Either of the following should work:

<local:SomeControl Margin="155,113,317,0" d:LayoutOverrides="Width, Height">
  <i:Interaction.Triggers>
    <i:EventTrigger EventName="MouseLeftButtonDown">
      <ei:ChangePropertyAction PropertyName="MyProp">
        <ei:ChangePropertyAction.Value>Second</ei:ChangePropertyAction.Value>
      </ei:ChangePropertyAction>
    </i:EventTrigger>
  </i:Interaction.Triggers>
</local:SomeControl>

or

<local:SomeControl Margin="155,113,317,0" d:LayoutOverrides="Width, Height">
  <i:Interaction.Triggers>
    <i:EventTrigger EventName="MouseLeftButtonDown">
      <ei:ChangePropertyAction PropertyName="MyProp" Value="Second" />
    </i:EventTrigger>
  </i:Interaction.Triggers>
</local:SomeControl>

If it is important to you to be able to refer to the MyEnum type from Xaml, you will need to move the definition out of the SomeControl class.

You need to make use of the x:Static markup extension, don;t forget to add namespace in XAML as needed.

Sample would be:

"{x:Static Member=MyProject:MyEnum.First}"

If you want to bring in binding into the equation, read this