We all know how sucky WPF validation is out of the box. I am trying a very simple thing and for some reason it is always failing. I have a TextBox and my only requirement is to validate that the user inputs something in the TextBox. The TextBox is bound to a Customer object with FirstName and LastName properties. We all know how sucky WPF validation is out of
阅读背景：
当文本框为空时，WPF文本框绑定验证规则不会在LostFocus上启动
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