无法加载MonoGame中的“加电”，编译过程中没有错误

Question

有一个小问题，使我的电源在屏幕上显示/加载，并且我在VS19中没有错误。蠕虫类继承自与Player和Enemy类相同的父类，并且它们都会加载。它们之间唯一的区别是蠕虫在Update()而不是LoadContent()中加载，所以我只能假设其中的代码有问题。

如果你看到任何奇怪的东西，请让我知道，提前谢谢！

Global声明了一个列表和一个纹理类型：

List<Worm> worms;
Texture2D wormSprite;

在load LoadContent()中，我将纹理赋给一个变量：

wormSprite = Content.Load<Texture2D>("worm");

然后，我假设Update()中的代码有问题：

 protected override void Update(GameTime gameTime)
        {
            if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed || Keyboard.GetState().IsKeyDown(Keys.Escape))
                Exit();

            // TODO: Add your update logic here

            /* player */ 
            player.Update(Window);

            /* power up */
            // worms that spawn in a chance of 200 each loop(60/s)
            Random random = new Random();
            int newWorm = random.Next(1, 200);
            if (newWorm == 1)
            {
                // cordinates for worms to appear
                int rndX = random.Next(0, Window.ClientBounds.Width - wormSprite.Width);
                int rndY = random.Next(0, Window.ClientBounds.Height - wormSprite.Height);
                // add the worm to the list
                worms.Add(new Worm(wormSprite, rndX, rndY, gameTime));
            }
            // loop thru the list of worms
            foreach (Worm w in worms.ToList())
            {
                if (w.IsAlive) // check if worm is alive
                {
                    // w.Update() check if the worm is to old to stay active
                    w.Update(gameTime);

                    // check if the worms collides with the player
                    if (w.CheckCollision(player))
                    {
                        // remove worm if collides
                        worms.Remove(w);
                        player.Points++; // and give the player a point
                    }
                }
                else // remove the worm if it's too inactive
                    worms.Remove(w);
            }
            base.Update(gameTime);
        }

打印到屏幕方法

 protected override void Draw(GameTime gameTime)
        {
            GraphicsDevice.Clear(Color.CornflowerBlue);

            // TODO: Add your drawing code here
            _spriteBatch.Begin();

            player.Draw(_spriteBatch);

            foreach (Enemy e in enemies)
                e.Draw(_spriteBatch);

            foreach (Worm w in worms)
                w.Draw(_spriteBatch);

            printText.Print("Points:" + player.Points, _spriteBatch, 0, 0);

            _spriteBatch.End();

            base.Draw(gameTime);
        }

从PhysicalObject()fd继承的PowerUp()类

    class Worm : PhysicalObject
    {
        double timeToDie; // active time of the worm
        // Worm(), construct to create a worm
        public Worm(Texture2D texture, float X, float Y, GameTime gameTime)
            : base(texture, X, Y, 0, 2f)
        {
            timeToDie = gameTime.TotalGameTime.TotalMilliseconds + 5000;
        }
        /* Update(), check if the worm should stay alive */
        public void Update(GameTime gameTime)
        {
            // kill worm if it stayed alive too long
            if (timeToDie < gameTime.TotalGameTime.TotalMilliseconds)
                isAlive = false;
        }

    }

Answer 1

忘记将bool变量设置为true

protected bool IsAlive; // changed to: protected bool IsAlive = true;