cocos2d-x 和cocos2d-xna的一些函数区别

关于actions里的参数问题
cocos2d-xna c#
CCAction action = CCSequence.actions(

                CCSpawn.actions( CCAnimate.actionWithAnimation(ani, false), 

                                 CCMoveBy.actionWithDuration(0.28f,p),

                                 CCCallFuncND.actionWithTarget(this,onWalkDone,tag))

                                 );

            enemy.runAction(action);


cocos2d-x里是这样的（当然，它是用c++写的，我这里是用c#写的伪c++代码）
CCAction action = CCSequence.actions(
                CCSpawn.actions( CCAnimate.actionWithAnimation(ani, false), 
                                 CCMoveBy.actionWithDuration(0.28f,p),null）,
                                 CCCallFuncND.actionWithTarget(this,onWalkDone,tag),null
                                 );
            enemy.runAction(action);
多了两个null，但是在c#（cocos2d-xna）里是不报错的，运行后才报错！