DependencyPropertyDescriptor descriptor;
descriptor = DependencyPropertyDescriptor.FromProperty(LeftProperty, typeof(Window));
//第一个对象为触发变化的对象
descriptor.AddValueChanged(this, (o, handle) =>
{
var left = this.Left;
Trace.TraceInformation(left.ToString());
});
原文：https://www.cnblogs.com/ives/p/14797632.html