产卵敌人+导弹射击的限制

Question

我遇到了产生敌人的问题。我试图用Timer和for循环生成它们，但似乎它不会在游戏中产生我的敌人。这是代码，我现在不知道如何产生它们：

    private void startButton_Click(object sender, EventArgs e)
    {
        startButtonWasClicked = true;
        logo.Visible = false;
        startButton.Visible = false;
        startButton.Enabled = false;
        spaceship.Visible = true;
        PictureBox enemy = new PictureBox();
        enemy.BackColor = Color.White;
        enemy.Height = 20;
        enemy.Width = 20;
        Random position = new Random();
        int enemyPositionX = position.Next(0, 330);
        enemy.Location = new Point(enemyPositionX, 5);
        this.Controls.Add(enemy);
        System.Timers.Timer t3 = new System.Timers.Timer();
        t3.Interval = 500;
        t3.Elapsed += (sender3, args) =>
            {
                if (enemy.Location.Y <= 400)
                {
                    enemy.Location = new Point(enemy.Location.X, enemy.Location.Y + 2);
                }
                else
                {
                    enemy.Visible = false;
                }
            }; t3.Start();
    }

我还有一个导弹射击问题。我试图连续5次阻挡我的拍摄作为最大值，它只能在第一次使用，然后用户可以快速按空间然后轻松赢得游戏。

        if (e.KeyCode == Keys.Space)
        {
            e.Handled = true;
            e.SuppressKeyPress = true;
            if (startButtonWasClicked == true)
            {
                if (shoots < 5)
                {
                    shoots++;
                    PictureBox missile = new PictureBox();
                    missile.Location = new Point(spaceship.Location.X+28, spaceship.Location.Y+5);
                    missile.Image = (Image)Space_Defender_3.Properties.Resources.ResourceManager.GetObject("Missile");
                    missile.Height = 42;
                    missile.Width = 12;
                    this.Controls.Add(missile);
                    System.Timers.Timer t1 = new System.Timers.Timer();
                    t1.Interval = 50;
                    t1.Elapsed += (sender1, args) =>
                    {
                        if (missile.Location.Y > 0)
                        {
                            missile.Location = new Point(missile.Location.X, missile.Location.Y - 5);
                        }
                        else
                        {
                            missile.Visible = false;
                        }
                    };
                    t1.Start();
                }
                else if(shoots >= 5)
                {
                    System.Timers.Timer t2 = new System.Timers.Timer();
                    t2.Interval = 2000;
                    t2.Elapsed += (sender2, args) =>
                        {
                            shoots = 0;
                        };
                    t2.Start();
                }

请帮助我，如果有人可以帮助我，我会很高兴。

更新

我在想它，但它仍然没有产生我的敌人。

    private void startButton_Click(object sender, EventArgs e)
    {
        startButtonWasClicked = true;
        logo.Visible = false;
        startButton.Visible = false;
        startButton.Enabled = false;
        spaceship.Visible = true;
        enemy.BackColor = Color.Black;
        enemy.Image = Space_Defender_3.Properties.Resources.Enemy;
        enemy.Height = 36;
        enemy.Width = 29;
        System.Timers.Timer t4 = new System.Timers.Timer();
        t4.Interval = 500;
        t4.Elapsed += (sender4, args) =>
            {
                for(int i = 0; i<50; i++)
                {
                    Random position = new Random();
                    int enemyPositionX = position.Next(0, 330);
                    enemy.Location = new Point(enemyPositionX, 5);
                    this.Controls.Add(enemy);
                }
            };
        t4.Start();
        System.Timers.Timer t3 = new System.Timers.Timer();
        t3.Interval = 500;
        t3.Elapsed += (sender3, args) =>
            {
                if (enemy.Location.Y <= 400)
                {
                    enemy.Location = new Point(enemy.Location.X, enemy.Location.Y + 2);
                }
                else
                {
                    enemy.Visible = false;
                }
            }; t3.Start();
    }