我将如何在Loaded =“”上传递参数？

Question

I want to be able to pass an enum parameter upon Loaded=" " so I can easily identify the section that is loading without having to do string trickery on the name.

My Expander XAML:

<Expander Loaded="ExpanderLoaded" x:Name="Greeting_And_Opening_Expander" ExpandDirection="Down" IsExpanded="True" FontSize="14" FontWeight="Bold" Margin="5" BorderThickness="1" BorderBrush="#FF3E3D3D">

The Method I want it to call:

    private void ExpanderLoaded(object sender, RoutedEventArgs e, Sections section)
    {
        //Do stuff
    }

My Enum (It will be significantly larger, this is just a test run):

public enum Sections
{
    Default = 0,
    Opening = 1,
    Verify = 2
}

How do I go about passing the enum as a parameter upon Loading?

Answer 1

I would do this using EventTrigger and InvokeCommand action, that way in your view model ElementLoaded (For lack of a better name) gets called and the appropriate Enumeration gets passed in.

<Expander>
    <i:Interaction.Triggers>
        <i:EventTrigger EventName="Loaded">
            <i:InvokeCommandAction Command="{Binding ElementLoaded}" 
                               CommandParameter="{x:Static local:Sections.Default}"/>
        </i:EventTrigger>
    </i:Interaction.Triggers>
</Expander>

In your ViewModel, you will have a property of type ICommand called ElementLoaded, then in your constructor you initialize it as so

ElementLoaded = new ActionCommand(ElementLoadedMethod);

and the ElementLoadedMethod can be as so

    private void ElementLoadedMethod(object section)
    {
        var sectionEnumVal =  (Sections)section;
    }

This should be all you have to do.