WPF 自定义Command

无参Command:

 1 internal class DelegateCommand : ICommand
 2     {
 3         private readonly Action _execute;
 4         private readonly Func<bool> _canExecute;
 5 
 6         public DelegateCommand(Action execute) : this(execute, null) { }
 7         public DelegateCommand(Action execute, Func<bool> canExecute)
 8         {
 9             _execute = execute ?? throw new ArgumentNullException(nameof(execute));
10             _canExecute = canExecute;
11         }
12 
13         public void Execute(object parameter)
14         {
15             _execute();
16         }
17         public bool CanExecute(object parameter)
18         {
19             if (_canExecute == null) return true;
20             return _canExecute();
21         }
22 
23 
24         public event EventHandler CanExecuteChanged
25         {
26             add => CommandManager.RequerySuggested += value;
27             remove => CommandManager.RequerySuggested -= value;
28         }
29     }

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