您好，

您是否在MVAM中使用了xaml中对视图模型的引用？

are you using MVVM with a reference to your view-model in your xaml?

I遇到这个问题一次。一种可能的解决方案是在代码隐藏中引用视图模型。

I run into this issue once. One possible solution is to reference the view-model in code-behind.