c# - 如果条件在XNA中播放声音，是否不播放声音？

Question

我想在单击鼠标左键后播放枪声，但是我的代码不起作用。(正在运行，没有错误，但没有播放声音)

如果我删除“如果条件”并运行游戏，则一旦游戏运行，第一件事就是枪声。

但是，如果我使用“如果条件”，即使单击鼠标左键也无法正常工作。我需要帮助来解决这一问题。

class Gun
        {
            Texture2D gun;
            Vector2 position;
            SoundEffect soundEffect;

            public Gun(ContentManager Content)
            {
                gun = Content.Load<Texture2D>("Gun");
                position = new Vector2(10, 10);
                MouseState mouse = Mouse.GetState();

                if (mouse.LeftButton == ButtonState.Pressed)
                {
                    soundEffect = Content.Load<SoundEffect>("gunshot");
                    soundEffect.Play();
                }
            }

Answer 1

如原始帖子的评论中所述，仅在创建对象时才检查LeftButton状态。您需要做的是添加一个Update方法来执行检查并播放声音效果。我还会将soundEffect加载移出该循环，并在构造或加载对象时执行该操作，以便您具有以下内容:

    public class Gun
    {
        Texture2D gun;
        Vector2 position;
        SoundEffect soundEffect;
        MouseState _previousMouseState, currentMouseState;

        public Gun(ContentManager Content)
        {
            gun = Content.Load<Texture2D>("Gun");
            soundEffect = Content.Load<SoundEffect>("gunshot");
            position = new Vector2(10, 10);
        } 


        public void Update(GameTime gameTime)
        {
            // Keep track of the previous state to only play the effect on new clicks and not when the button is held down
            _previousMouseState = _currentMouseState;
            _currentMouseState = Mouse.GetState();
            if(_currentMouseState.LeftButton == ButtonState.Pressed && _previousMouseState.LeftButton != ButtonState.Pressed)
               soundEffect.Play();
        }
    }

然后在游戏的Update循环中，仅调用gun.Update(gameTime)(其中gun是您的gun类的实例)