我将使用EventTrigger和InvokeCommand操作来执行此操作，以这种方式在您的视图模型ElementLoaded中调用(由于缺少更好的名称)，并传递了适当的枚举内.

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>

在ViewModel中，您将拥有ICommand类型的属性，称为ElementLoaded，然后在构造函数中将其初始化为

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);

和ElementLoadedMethod可以这样

and the ElementLoadedMethod can be as so

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

这应该是您要做的所有事情.

This should be all you have to do.