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更新时间：2022-09-17 19:51:42
http://***.com/questions/2444927/wpf-prism-canexecute-method-not-being-called
It is most likely that the bound control is never asking for the CanExecute state again. You need to call the RaiseCanExecuteChanged method on the DelegateCommand whenever you detect a condition that changes the command's CanExecute state. This signals the bound control to update theCanExecute state.
solution
private void RaiseCanExecuteChanged() { DelegateCommand<object> command = LoginCommand as DelegateCommand<object>; command.RaiseCanExecuteChanged(); } public const string UsernameProperty = "Username"; private String _username; public String Username { get { return _username; } set { _username = value; this.NotifyPropertyChanged(UsernameProperty); RaiseCanExecuteChanged(); } }