我一直在研究行为(Behaviors),最近遇到了一个有趣的问题。
这是我的行为代码:
public class AddNewBehavior : BaseBehavior<RadGridView, AddNewBehavior>
{
public static readonly DependencyProperty IsEnabledProperty = DependencyProperty.RegisterAttached("IsEnabled", typeof(bool), typeof(AddNewBehavior), new FrameworkPropertyMetadata(false, OnIsEnabledChanged));
public static void SetIsEnabled(DependencyObject obj, bool isEnabled)
{
obj.SetValue(IsEnabledProperty, isEnabled);
}
public static bool GetIsEnabled(DependencyObject obj)
{
return (bool)obj.GetValue(IsEnabledProperty);
} ... OnIsEnabledChanged(...)}
当我设置以下样式时,这将非常有效:
<Style TargetType="telerikGridView:RadGridView">
<Setter Property="Behaviors:AddNewBehavior.IsEnabled" Value="true" />
</Style>
但是如果我把这个放在一个抽象类中
public abstract class BaseBehavior<TObj, TBehavior> : Behavior<TObj>
where TObj : DependencyObject
where TBehavior : BaseBehavior<TObj, TBehavior>, new()
{
public static readonly DependencyProperty IsEnabledProperty = DependencyProperty.RegisterAttached("IsEnabled", typeof(bool), typeof(TBehavior), new FrameworkPropertyMetadata(false, OnIsEnabledChanged));
public static void SetIsEnabled(DependencyObject obj, bool isEnabled)
{
obj.SetValue(IsEnabledProperty, isEnabled);
}
public static bool GetIsEnabled(DependencyObject obj)
{
return (bool)obj.GetValue(IsEnabledProperty);
}
public static void OnIsEnabledChanged(DependencyObject dpo, DependencyPropertyChangedEventArgs e)
{
BehaviorCollection behaviorCollection = Interaction.GetBehaviors(dpo);
if ((bool)e.NewValue)
{
var firstOrDefault = behaviorCollection.Where(b => b.GetType() == typeof(TBehavior)).FirstOrDefault();
if (firstOrDefault == null)
{
behaviorCollection.Add(new TBehavior());
}
}
}
}
不知道我做错了什么,如果能在基类中使用IsEnabled代码会很好。
谢谢。