wpf - Enum 的 DataStateBehavior 而不是 bool？字符串？

Question

WPF 中是否有一种简单的方法可以将 VisualStates 绑定(bind)到枚举值？有点像 DataStateBehavior，但对于枚举？

Answer 1

最好的方法是继续执行一个 Behavior 来做到这一点 -

public class EnumStateBehavior : Behavior<FrameworkElement>
{
    public object EnumProperty
    {
        get { return (object)GetValue(EnumPropertyProperty); }
        set { SetValue(EnumPropertyProperty, value); }
    }

    // Using a DependencyProperty as the backing store for EnumProperty.  This enables animation, styling, binding, etc...
    public static readonly DependencyProperty EnumPropertyProperty =
        DependencyProperty.Register("EnumProperty", typeof(object), typeof(EnumStateBehavior), new UIPropertyMetadata(null, EnumPropertyChanged));

    static void EnumPropertyChanged(object sender, DependencyPropertyChangedEventArgs e)
    {
        if (e.NewValue == null) return;

        EnumStateBehavior eb = sender as EnumStateBehavior;

        VisualStateManager.GoToElementState(eb.AssociatedObject, e.NewValue.ToString(), true);
    }

}

用法非常简单——使用如下:

<i:Interaction.Behaviors>
        <local:EnumStateBehavior EnumProperty="{Binding MyEnumProperty}" />
</i:Interaction.Behaviors>