PageNavigationUsingMVVM/Utilities/RelayCommand.cs

（完整代码） 796B 

using System;
using System.Windows.Input;

namespace PageNavigationUsingMVVM.Utilities
{
    class RelayCommand : ICommand
    {
        private readonly Action<object> _execute;
        private readonly Func<object, bool> _canExecute;

        public event EventHandler CanExecuteChanged
        {
            add { CommandManager.RequerySuggested += value; }
            remove { CommandManager.RequerySuggested -= value; }
        }
        public RelayCommand(Action<object> execute, Func<object, bool> canExecute = null)
        {
            _execute = execute;
            _canExecute = canExecute;
        }
        public bool CanExecute(object parameter) => _canExecute == null || _canExecute(parameter);
        public void Execute(object parameter) => _execute(parameter);
    }
}

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