显然,我不是 C# 方面的专家。我想通过使用匿名处理程序或 lambda 来简化此代码,不确定。ValueHasChanged
是PropertyChangedCallback
在 dp 更改时使用的,它确保将监视新对象的更新,以便使用相同的代码处理更改和更新ProcessNewValue
:这里的遗憾是创建第二个处理程序ValueHasBeenUpdated
只是为了调用相同的方法。是否有可能删除 的定义ValueHasBeenUpdated
?谢谢。
private static void ValueHasChanged(
DependencyObject sender, DependencyPropertyChangedEventArgs args) {
// get instance
MyClass1 instance = sender as MyClass1;
// unregister on old object
if (args.OldValue != null) (args.OldValue as MyClass2).PropertyChanged -=
instance.ValueHasBeenUpdated;
// register for updates on new object
if (args.NewValue != null) (args.NewValue as MyClass2).PropertyChanged +=
instance.ValueHasBeenUpdated;
// process new value anyway
instance.ProcessNewValue();
}
// value has been updated
private void ValueHasBeenUpdated(object sender, PropertyChangedEventArgs e) {
// just call the actual method that will process it, not elegant...
ProcessNewValue();
}
// process any new or updated object
private void ProcessNewValue() {...}