/// <summary>
/// Initializes a new instance of the RelayCommand class.
/// </summary>
/// <param name="execute">The execution logic. IMPORTANT: If the action causes a closure,
/// you must set keepTargetAlive to true to avoid side effects. </param>
/// <param name="canExecute">The execution status logic. IMPORTANT: If the func causes a closure,
/// you must set keepTargetAlive to true to avoid side effects. </param>
/// <param name="keepTargetAlive">If true, the target of the Action will
/// be kept as a hard reference, which might cause a memory leak. You should only set this
/// parameter to true if the action is causing a closures. See
/// http://galasoft.ch/s/mvvmweakaction. </param>
/// <exception cref="ArgumentNullException">If the execute argument is null.</exception>
public RelayCommand(Action execute, Func <bool> canExecute, bool keepTargetAlive = false)
{
if (execute == null)
{
throw new ArgumentNullException("execute");
}
_execute = new WeakAction(execute, keepTargetAlive);
if (canExecute != null)
{
_canExecute = new WeakFunc <bool>(canExecute, keepTargetAlive);
}
}