添加行graphic.ApplyChanges()时的NoSuitableGraphicsDeviceException；

Question

我刚刚开始学习xna中的c#，我正在制作一个简单的塔防游戏。当我添加这一行时，我收到一条错误消息。

graphic.ApplyChanges();

Here是指向错误消息屏幕截图的链接。当我启动游戏时，它会运行几秒钟，然后关闭，并向我显示以下消息。在这个之前，我已经做了一些其他的游戏，我以前从来没有遇到过这个问题。我是编程的初学者，所以如果你还有什么需要帮助的，请让我知道。

更新:我尝试在一个新项目中重现这个错误，但没有成功。我将在这里发布我的代码，这样比我知识更多的人可以阅读它，也许可以找到导致错误的原因。

Game1类：

using System;
using System.Collections.Generic;
using System.Linq;
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 AdventureGame
{
/// <summary>
/// This is the main type for your game
/// </summary>
public class Game1 : Microsoft.Xna.Framework.Game
{


    GraphicsDeviceManager graphics;
    SpriteBatch spriteBatch;
    Texture2D tilegraphic;
    MouseState oldmouse;
    MouseState currentmouse;
    Point mouseposition;
    Color defaultcolor;
    Color selectedcolor;
    Color pathcolor;




    public Game1()
    {
        graphics = new GraphicsDeviceManager(this);
        Content.RootDirectory = "Content";
        graphics.PreferredBackBufferWidth = 800;
        graphics.PreferredBackBufferHeight = 600;




    }


    /// <summary>
    /// Allows the game to perform any initialization it needs to before starting to run.
    /// This is where it can query for any required services and load any non-graphic
    /// related content.  Calling base.Initialize will enumerate through any components
    /// and initialize them as well.
    /// </summary>
    protected override void Initialize()
    {

        IsMouseVisible = true;
        // TODO: Add your initialization logic here
        base.Initialize();
        oldmouse = new MouseState();
        currentmouse = new MouseState();
        defaultcolor = new Color();
        selectedcolor = new Color();
        defaultcolor = Color.LawnGreen;
        selectedcolor = Color.DarkGreen;
        pathcolor = Color.SaddleBrown;


    }


    /// <summary>
    /// LoadContent will be called once per game and is the place to load
    /// all of your content.
    /// </summary>
    protected override void LoadContent()
    {

        // Create a new SpriteBatch, which can be used to draw textures.
        spriteBatch = new SpriteBatch(GraphicsDevice);
        tilegraphic = Content.Load<Texture2D>("tilegraphic") as Texture2D;



        // TODO: use this.Content to load your game content here
    }


    /// <summary>
    /// UnloadContent will be called once per game and is the place to unload
    /// all content.
    /// </summary>
    protected override void UnloadContent()
    {
        // TODO: Unload any non ContentManager content here
    }


    /// <summary>
    /// Allows the game to run logic such as updating the world,
    /// checking for collisions, gathering input, and playing audio.
    /// </summary>
    /// <param name="gameTime">Provides a snapshot of timing values.</param>
    protected override void Update(GameTime gameTime)
    {


        oldmouse = currentmouse;
        currentmouse = Mouse.GetState();
        mouseposition = new Point(currentmouse.X, currentmouse.Y);


        // Allows the game to exit
        if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed)
            this.Exit();

        // TODO: Add your update logic here

        base.Update(gameTime);
    }


    /// <summary>
    /// This is called when the game should draw itself.
    /// </summary>
    /// <param name="gameTime">Provides a snapshot of timing values.</param>
    protected override void Draw(GameTime gameTime)
    {
        GraphicsDevice.Clear(Color.White);

        spriteBatch.Begin();



        DrawMap();






        spriteBatch.End();
        // TODO: Add your drawing code here

        base.Draw(gameTime);
    }


    public bool MouseJustPressed()
    {
        if (oldmouse.LeftButton == ButtonState.Released && currentmouse.LeftButton == ButtonState.Pressed)
        {
            return true;
        }
        else
        {
            return false;
        }
    }



    public void DrawMap()
    {
        Map1 map = new Map1();
        map.Layout();
        map.CreateRectangles();
        for (int x = 0; x < map.mapwidth; x++)
        {
            for (int y = 0; y < map.mapheight; y++)
            {
                switch (map.tiles[x, y])
                {
                    case 0:
                        if (map.tilerectangles[x, y].Contains(mouseposition))
                        {
                            spriteBatch.Draw(tilegraphic, map.tilerectangles[x, y], selectedcolor);
                        }
                        else
                        {
                            spriteBatch.Draw(tilegraphic, map.tilerectangles[x, y], defaultcolor);
                        }
                        break;
                    case 1:
                        spriteBatch.Draw(tilegraphic, map.tilerectangles[x, y], pathcolor);
                        break;
                }


            }   

        }
    }
}
}

Map1类：

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 AdventureGame
{
class Map1
{
    public int[,] tiles = new int[7, 7];
    public Rectangle[,] tilerectangles = new Rectangle[8, 8];
    Game1 game = new Game1();
    public int mapwidth = 8;
    public int mapheight = 8;
    public void Layout()
    {
        tiles = new int[,] {
        {0,1,0,0,0,0,0,0},
        {0,1,0,1,1,1,1,1},
        {0,1,0,1,0,0,0,0},
        {0,1,0,1,1,1,1,0},
        {0,1,0,0,0,0,1,0},
        {0,1,0,0,0,0,1,0},
        {0,1,1,1,1,1,1,0},
        {0,0,0,0,0,0,0,0},};
    }

    public void CreateRectangles()
    {
        for (int x = 0; x < mapwidth; x++)
        {
            for (int y = 0; y < mapheight; y++)
            {
                tilerectangles[x, y] = new Rectangle(x * 70, y * 70, 70, 70);
            }

        }




    }
}
}

Answer 1

我已经找到了代码中的错误之处。当我在我的方法DrawMap()中添加行Game1 game = new Game1();来快速测试它到目前为止是否正常工作时，程序显然不喜欢它，并给了我一个错误。因此，当我用我的其他变量声明它，并将行map = new Map1();放入initialize方法中时，它工作得很好。谢谢你给我的帮助。

Answer 2

在Initialize()方法中，将行Graphics.ApplyChanges()放在base.Initialize()行之后，或放在LoadContent()方法的开头。