Question

我是XNA的初学者，正在尝试为C＃XNA游戏创建screenManager。我的代码中的所有内容似乎都能正常工作，直到我的LoadContent类中的MainMenu方法从Screen派生，这是一个自定义的独立类。这是我的GraphicsDevice组件未找到ContentLoad例外的地方。

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，这个语句和程序就可以了。但是，我只想加载一次纹理，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中有一些注释掉的语句几乎完全相同，都会产生相同的错误。我在这里发布我的全部代码。希望它不会充斥论坛。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();

            }
        }




    }
}

Screen.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);
        }
    }
}

提前致谢....

修改
我发现了我的错误。我在ScreenController.Add的{{1}}之前致电LoadContent。我把它放在GameController base.LoadContent之后，现在可以了。我希望这可以帮助别人，但如果有人知道更好的方法来解决这个问题，请告诉我。

Answer 1

您从MainMenu.LoadContent的构造函数中调用ScreenController，Game's的构造函数又由LoadContent构造函数调用。应在适当的时候调用AddScreen。因此，将LoadContent的呼叫转移到GameController的{{1}}方法。

xna从非GameComponent类加载内容

1 个答案: