c# - XNA未知内存泄漏导致游戏崩溃

Question

您好!
我正在 XNA 开发一款太空射击游戏。游戏运行正常，我在代码中找不到任何错误。但是，当我从我的宇宙飞船发射太多子弹时，游戏就会崩溃。

当子弹离开屏幕时，我确实删除了它们，但它们仍然导致游戏崩溃。

我得到的错误信息是:

"An unhandled exception of type 'System.ComponentModel.Win32Exception' occurred in System.Drawing.dll" "Additional information: The process has ended"

标记的行是:

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

这里是子弹的相关代码:

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);
        }
    }  

子弹.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有任何想法，或者它是否根本就是内存泄漏？

Answer 1

尝试向后迭代项目符号列表:

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

当您删除列表中第 i 处的项目时，第 i+1 处的项目将被下推到 i，但您现在将跳过该项目。我认为这可能会导致您的内存泄漏。逆向工作应该可以避免这个问题。