Question

如何在MyDP1_Changed和MyDP1_Changed中禁用调用回调方法？当我从其他回调方法

更改值时，我需要可调回调

class MyDependencyObject : DependencyObject
{

        public object MyDP1 {
           get{ return GetValue(MyDP1Property); }
           set{ return SetValue(MyDP1Property, value); }
        }

        public object MyDP2 {
           get{ return GetValue(MyDP2Property); }
           set{ return SetValue(MyDP2Property, value); }
        }

        public static readonly DependencyProperty MyDP1Property =
            DependencyProperty.Register("MyDP1", typeof(object), typeof(MyDependencyObject )
            , new UIPropertyMetadata(MyDP1_Changed));

        public static readonly DependencyProperty MyDP2Property =
            DependencyProperty.Register("MyDP2", typeof(object), typeof(MyDependencyObject )
            , new UIPropertyMetadata(MyDP2_Changed));

        private static void MyDP1_Changed(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            d.SetValue(MyDP2Property, e.NewValue);
        }

        private static void MyDP2_Changed(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            d.SetValue(MyDP1Property, e.OldValue);
        }
}

Answer 1

首先，您需要使用SetCurrentValue而不是SetValue - 否则您将破坏绑定。

其次，您可以使用这些方法临时添加和删除回调

TypeDescriptor.GetProperties(d)["MyDP1"].RemoveValueChanged(d, MyDP1_Changed)

TypeDescriptor.GetProperties(d)["MyDP1"].AddValueChanged(d, MyDP1_Changed)

如何处理DependencyProperty回调

1 个答案: