/// <summary>
/// Initializes a new instance of the RelayCommand class.
/// </summary>
/// <param name="execute">The execution logic.</param>
/// <param name="canExecute">The execution status logic.</param>
/// <exception cref="ArgumentNullException">If the execute argument is null.</exception>
public RelayCommand(Action <T> execute, Func <T, bool> canExecute)
{
if (execute == null)
{
throw new ArgumentNullException("execute");
}
_execute = new WeakAction <T>(execute);
if (canExecute != null)
{
_canExecute = new WeakFunc <T, bool>(canExecute);
}
}