您需要执行 INotifyPropertyChanged的在您的视图模型以通知认为，属性已更改

You need to implement INotifyPropertyChanged in your ViewModel order to notify the View that the property has changed.

下面是到MSDN页面的链接吧：的System.ComponentModel.INotifyPropertyChanged

Here's a link to the MSDN page for it: System.ComponentModel.INotifyPropertyChanged

要注意的最重要的事情是，你应该提高你的属性setter的的PropertyChanged 事件。

The most important thing to note is that you should raise the PropertyChanged event in your property setter.