xna 从非 GameComponent 类加载内容

Question

我是 XNA 的相对初学者，正在尝试为 C# XNA 游戏创建screenManager。我的代码中的一切似乎都可以正常工作，直到我到达我的MainMenu 类中的LoadContent 方法，该方法派生自Screen，这是一个自定义的独立类。这是我得到我的GraphicsDevice 组件未找到ContentLoad 异常的地方。

这是在声明中：texture = c.Load<Texture2D>("Textures/Start"); 其中 c 是 ContentManager。

如果我把它放在我班级的 Update 方法中，这个语句和程序可以正常工作。但是，我只想加载这个纹理一次，而不是每次调用Update(GameTime)。我想我必须在初始化一些内容信息之前调用 load 但我不确定是什么。 MainMenu.LoadContent 中有一些被注释掉的语句，它们的作用几乎相同，并且都产生相同的错误。我在这里发布我的整个代码。希望不会充斥论坛。 这是 Game1.cs：

namespace RoomGame
{
    /// <summary>
    /// This is the main type for your game
    /// </summary>
    public class Game1 : Microsoft.Xna.Framework.Game
    {
        public static GraphicsDeviceManager graphics;
        SpriteBatch spriteBatch;
        GameController gameController;

        public Game1()
        {
            graphics = new GraphicsDeviceManager(this);
            Content.RootDirectory = "Content";

            gameController = new GameController(this,this.Content);
            this.Components.Add(gameController);
        }

    }
}

GameController.cs：

namespace RoomGame
{
    public class GameController : DrawableGameComponent
    {
        public Game game;
        public ContentManager content;
        public ScreenController screenController;
        public MainMenu menu;
        public GameController(Game game,ContentManager c)
            : base(game)
        {
            this.game = game;
            content = c;
            screenController = new ScreenController(this);
            menu = new MainMenu(this,this.content);
            screenController.AddScreen(menu);
        }

        public override void Initialize()
        {
            base.Initialize();
            screenController.Initialize();
        }

        protected override void LoadContent()
        {
            base.LoadContent();
        }

        protected override void UnloadContent()
        {
            base.UnloadContent();
        }

        public override void Update(GameTime gameTime)
        {
            screenController.Update(gameTime);
            base.Update(gameTime);
        }

        public override void Draw(GameTime gameTime)
        {
            base.Draw(gameTime);
            screenController.Draw(gameTime);
        }
    }
}

screenController.cs：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;

namespace RoomGame
{

    public class ScreenController
    {
        public List<Screen> screens = new List<Screen>();
        GameController gameController;
        SpriteBatch spriteBatch;

        public ScreenController(GameController gc)
        {
            this.gameController = gc;
        }

        public void Initialize()
        {

            spriteBatch = new SpriteBatch(this.gameController.GraphicsDevice);
        }

        public void Update(GameTime gameTime)
        {
            foreach (Screen screen in screens)
            {
                if (screen.isUpdating)
                    screen.Update(gameTime);
            }
        }

        public void Draw(GameTime gameTime)
        {
            foreach (Screen screen in screens)
            {
                if (screen.isDrawn)
                {
                    spriteBatch.Begin();
                    screen.Draw(gameTime,spriteBatch);
                    spriteBatch.End();
                }
            }
        }

        public void AddScreen(Screen screen)
        {
            if (!screens.Contains(screen))
            {
                screen.LoadContent(this.gameController.game.Content);
                screens.Add(screen);
                //screen.Initialize();

            }
        }




    }
}

屏幕.cs：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Content;

namespace RoomGame
{
    public class Screen
    {
        public ScreenController screenController;
        public bool isUpdating=true;
        public bool isDrawn=true;
        public GraphicsDeviceManager graphics;

        /*public Screen(ScreenController sc)
        {
            this.screenController = sc;
            this.isActive = true;
        }*/

        public virtual void Initialize()
        { }

        public virtual void LoadContent(ContentManager c)
        { }


        public virtual void Update(GameTime gameTime)
        { }

        public virtual void Draw(GameTime gameTime,SpriteBatch sb)
        { }
    }
}

MainMenu.cs：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Content;

namespace RoomGame
{
    public class MainMenu : Screen
    {
        GameController gameController;
        Texture2D texture;
        Vector2 position;
        ContentManager content;
        //public GraphicsDeviceManager graphics;

        public MainMenu(GameController gc,ContentManager c)
        {
            this.gameController = gc;
            this.content = c;
            this.isUpdating = true;
            this.isDrawn = true;
            //this.graphics = this.gameController.game.graphics;
        }

        public override void LoadContent(ContentManager c)
        {

            texture = c.Load<Texture2D>("Textures/Start");
            //texture = this.gameController.game.Content.Load<Texture2D>("Textures/Start");
            //texture=this.gameController.content.Load<Texture2D>("Textures/Start");
            //texture = this.gameController.Game.Content.Load<Texture2D>("Textures/Start");
        }


        public override void Update(GameTime gameTime)
        {
            //texture = this.gameController.content.Load<Texture2D>("Textures/Start");
            position = new Vector2(100, 100);
        }

        public override void Draw(GameTime gameTime,SpriteBatch sb)
        {
            sb.Draw(texture, position, Color.White);
        }
    }
}

提前谢谢....

编辑
我发现了我的错误。我在GameController 中的LoadContent 之前调用了ScreenController.Add。我把它放在gameController 中的base.LoadContent 之后，它现在可以工作了。我希望这可以帮助某人，但如果有人知道更好的解决方法，请告诉我。

Answer 1

您从ScreenController 的构造函数调用MainMenu.LoadContent，而Game's 构造函数又调用它。 LoadContent 应该在适当的时候调用。因此，将对AddScreen 的调用移至GameController 的LoadContent 方法。