XNA未知内存泄漏导致游戏崩溃

你好
我正在XNA制作一款太空射击游戏。游戏正常运行我在代码中找不到任何错误。然而，当我从我的宇宙飞船发射了太多子弹时，游戏崩溃了。

我确实在子弹离开屏幕时删除了它们，但它们仍然会导致游戏崩溃。

我得到的错误信息是：

"System.Drawing.dll中发生类型为"System.ComponentModel.Win32Exception"的未处理异常"附加信息：进程已结束"

标记线是：

public Bullet(Texture2D texture, Color color, float speed, int scale)  

这是子弹的相关代码：

Game1.cs

   // This is a member variable at the top of my program
   public List<Bullet> bullets = new List<Bullet>();  
   // Further down
    public void UpdateBullets()
    {
        foreach (Bullet bullet in bullets)
        {
            bullet.position.Y += bullet.speed;
            if (bullet.position.Y >= GraphicsDevice.Viewport.Height || bullet.position.Y + bullet.height <= 0
            || bullet.position.X < 0 || bullet.position.X - bullet.width > GraphicsDevice.Viewport.Width)
                bullet.isVisible = false;
        }
        for (int i = 0; i < bullets.Count(); i++)
        {
            if (!bullets[i].isVisible)
            {
                bullets[i].texture = null;
                bullets[i] = null;
                bullets.Remove(bullets[i]);
            }
        }
    }  
    public void Shoot(Entity e, Texture2D texture)
    {
        Bullet newBullet = new Bullet(texture, e.color, e.bulletSpeed, 16);
        newBullet.owner = e;
        newBullet.SetPositionByBottom(e.bulletPoint);
        newBullet.isVisible = true;
        if (bullets.Count() < maxBullets)
        {
            bullets.Add(newBullet);
        }
    }  
        public void DrawBullets()
    {
        foreach (Bullet bullet in bullets)
        {
            bullet.Draw(spriteBatch);
        }
    }  

Bullet.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Audio;
using Microsoft.Xna.Framework.Content;
using Microsoft.Xna.Framework.GamerServices;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;
using Microsoft.Xna.Framework.Media;
namespace SpaceShooter
{
    class Bullet : GameObject
    {
        public float speed;
        public bool isVisible;
        public Entity owner;
        public Bullet(Texture2D texture, Color color, float speed, int scale)
        {
            this.color = color;
            this.texture = texture;
            this.speed = speed;
            width = scale;
            height = scale * 2;
            isVisible = false;
        }
    }
}  

关于内存泄漏的来源，或者它是否是内存泄漏，有什么想法吗

for (int i = bullets.Count()-1; i >= 0; i--)
{
    if (!bullets[i].isVisible)
    {
        bullets[i].texture = null;
        bullets[i] = null;
        bullets.Remove(bullets[i]);
    }
}