AddinManager/AddInManager/RelayCommand.cs

using System;
using System.Windows.Input;

namespace AddInManager
{
    internal class RelayCommand : ICommand
    {
        private Action<object> execute;
        private Func<object, bool> canExecute;

        public event EventHandler CanExecuteChanged;

    
        public RelayCommand(Action<object> execute, Func<object, bool> canExecute = null)
        {
            if (execute == null)
                throw new System.ArgumentNullException();
            this.execute = execute;
            this.canExecute = canExecute;
        }

        public bool CanExecute(object parameter)
        {
            return canExecute == null || canExecute(parameter);
        }

        public void Execute(object parameter)
        {
            execute(parameter);
        }
    }
}