C＃ArgumentNullException未處理（SpriteBatch.Draw）

我其實是XNA的新生，發現這個庫非常有趣，但我仍然缺乏一些知識去進一步，因爲我覺得我無法自己解決一個問題:(C＃ArgumentNullException未處理（SpriteBatch.Draw）

spriteBatch.Draw（）方法說我的紋理爲空，但是我已經將它加載到Resources.cs類中，並在MainMenu.cs中傳遞了紋理，所以我不知道問題出在哪裏，如果有人可以幫助我，我會非常感激！

Resources.cs

class Resources 
{ 
    public static Texture2D pixel; 
    public static Texture2D startButton, loadButton, quitButton; 

    public static SpriteFont consoleFont; 

    public static void LoadContent(ContentManager Content) 
    { 
     pixel = Content.Load<Texture2D>("Pixel"); 
     consoleFont = Content.Load<SpriteFont>("Console"); 

     // UI Ressources : 
     startButton = Content.Load<Texture2D>("UI/StartButton"); 
     loadButton = Content.Load<Texture2D>("UI/LoadButton"); 
     quitButton = Content.Load<Texture2D>("UI/QuitButton"); 
    } 
}

個

MainMenu.cs

class MainMenu 
{ 
    // Fields 
    List<Button> buttons = new List<Button>(); 

    // Constructors 
    public MainMenu() 
    { 
     this.buttons.Add(new Button(new Vector2(480, 132), 256, 48, Resources.startButton)); 
     this.buttons.Add(new Button(new Vector2(480, 212), 256, 48, Resources.loadButton)); 
     this.buttons.Add(new Button(new Vector2(480, 292), 256, 48, Resources.quitButton)); 
    } 

    // Methods 

    // Update 
    public void Update() 
    { 
    } 

    // Draw 
    public void Draw(SpriteBatch spriteBatch) 
    { 
     foreach (Button button in buttons) 
     { 
      button.Draw(spriteBatch); 
     } 
    } 
}

Button.cs

class Button : UIElement 
{ 
    int width, height; 
    Texture2D texture; 

    public Button() 
    { 
    } 

    public Button(Vector2 b_position, int b_width, int b_height, Texture2D b_texture) 
    { 
     this.position = b_position; 
     this.width = b_width; 
     this.height = b_height; 
     this.texture = b_texture; 
    } 

    public void Update() 
    { 
    } 

    public void Draw(SpriteBatch spriteBatch) 
    { 
     spriteBatch.Draw(texture, position, Color.White); 
    } 
}

來源

2016-04-20 Jean Meier

簡單真的
你一定要知道的Game1函數的調用順序。首先，調用Game1構造函數。這就是你放置mainMenu = new MainMenu();的地方。之後去Initialize，Load等。您必須將mainMenu = new MainMenu();從Game1構造函數移動到Load函數，在Resources.LoadContent(Content);之後，因此在使用MainMenu之前可以加載資源。你Game1.cs代碼應該是這樣的：

public class GameMain : Microsoft.Xna.Framework.Game 
{ 
    GraphicsDeviceManager graphics; 
    SpriteBatch spriteBatch; 

    MainMenu mainMenu; 

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

     this.IsMouseVisible = true; 
    } 

    protected override void Initialize() 
    { 
     // TODO: Add your initialization logic here 

     base.Initialize(); 
    } 

    protected override void LoadContent() 
    { 
     // Create a new SpriteBatch, which can be used to draw textures. 
     spriteBatch = new SpriteBatch(GraphicsDevice); 

     // TODO: use this.Content to load your game content here 
     Resources.LoadContent(Content); 
     mainMenu = new MainMenu(); 
    } 

    protected override void UnloadContent() 
    { 
     // TODO: Unload any non ContentManager content here 
    } 

    protected override void Update(GameTime gameTime) 
    { 
     // 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); 
    } 

    protected override void Draw(GameTime gameTime) 
    { 
     GraphicsDevice.Clear(Color.CornflowerBlue); 

     // TODO: Add your drawing code here 
     spriteBatch.Begin(); 
     mainMenu.Draw(spriteBatch); 
     spriteBatch.End(); 
     base.Draw(gameTime); 
    } 
}

來源

2016-04-21 14:41:11 Monset

謝謝你的工作！我不知道我可以這樣做，我一直在尋找一個視頻，其中的人在遊戲構造函數中聲明瞭他的菜單，我發現它並不總是這樣，當我考慮它時是邏輯：D –

@JeanMeier人可能沒有資源類：D順便說一句，這是一個很好的概念！（你可以使它靜態）資源類。保持！ – Monset

雖然我沒有看到你的遊戲類我的第一個假設是，你永遠不會調用公共靜態無效LoadContent（ContentManager內容）裏面的方法資源類。由於此功能正在實例化您的紋理，因此可能不會被調用。

來源

2016-04-20 22:33:12 Lockdowne

我認爲這將這個遺憾，我已經添加了遊戲級以上:)之後添加了新的消息！ –

謝謝您的回覆！的確，我忘了包含Game類，這是調用資源的正確方式嗎？

public class GameMain : Microsoft.Xna.Framework.Game 
{ 
    GraphicsDeviceManager graphics; 
    SpriteBatch spriteBatch; 

    MainMenu mainMenu; 

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

     this.IsMouseVisible = true; 

     mainMenu = new MainMenu(); 
    } 

    protected override void Initialize() 
    { 
     // TODO: Add your initialization logic here 

     base.Initialize(); 
    } 

    protected override void LoadContent() 
    { 
     // Create a new SpriteBatch, which can be used to draw textures. 
     spriteBatch = new SpriteBatch(GraphicsDevice); 

     // TODO: use this.Content to load your game content here 
     Resources.LoadContent(Content); 
    } 

    protected override void UnloadContent() 
    { 
     // TODO: Unload any non ContentManager content here 
    } 

    protected override void Update(GameTime gameTime) 
    { 
     // 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); 
    } 

    protected override void Draw(GameTime gameTime) 
    { 
     GraphicsDevice.Clear(Color.CornflowerBlue); 

     // TODO: Add your drawing code here 
     spriteBatch.Begin(); 
     mainMenu.Draw(spriteBatch); 
     spriteBatch.End(); 
     base.Draw(gameTime); 
    } 
}

來源

2016-04-21 07:41:36

C＃ArgumentNullException未處理（SpriteBatch.Draw）

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