问题似乎是没有调用CanExecute()进行验证.它只验证一次,就像加载窗口时一样.
这可能是最近更新中的错误还是我需要在XAML中更改某些内容？
在更新之前一切正常.我正在使用WPF.
解决方法
WPF is the only XAML framework that uses the CommandManager to
automagically raise the CanExecuteChanged event on ICommands. I never
liked that approach,because of the “magic” part,but this is a
“feature” of WPF and of course I have to support it. No question here.In V5,I moved to portable class library for all the newest versions
of the XAML frameworks,including WPF4.5. Unfortunately,there is no
CommandManager in PCL,and I have to admit that I didn’t realize that
at first sight. So of course now the automagical part doesn’t work
anymore. Again,so sorry about that.I am not expecting you to raise CanExecuteChanged everywhere now,not
after using the CommandManager in your application,which is what the
WPF team intended. So I will try to find a way to restore the
CommandManager usage in the WPF4.5 version of the toolkit.Definitely not looking for excuses 原文链接：https://www.f2er.com/csharp/92583.html
