Question

我要为自己创造一个游戏来学习，但我遇到了一个问题，我真的不知道如何修复它。

错误是：

This method does not accept null for this parameter.

我已经搜索了它，它告诉我我没有正确加载纹理，我想我做了。因为它在Draw命令之前。

继承我的Game1.cs：

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 Eggt_Fast

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

            Player player = new Player();

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

                graphics.PreferredBackBufferHeight = 600;
                graphics.PreferredBackBufferWidth = 800;
                this.Window.Title = "Eggt Fast";
                graphics.ApplyChanges();
            }

            /// <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()
            {
                // TODO: Add your initialization logic here

                base.Initialize();
            }

            /// <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);

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

                // TODO: Add your update logic here

                player.Update(gameTime);
                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.CornflowerBlue);

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

                base.Draw(gameTime);
            }
        }
    }

这是我的Player.cs：

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


namespace Eggt_Fast
{
    class Player
    {
        public Texture2D texture;
        public Vector2 position;
        public int speed;

        public Rectangle boundingBox;
        public bool isColliding;


        public Player()
        {
            texture = null;
            position = new Vector2(300, 300);
            speed = 14;
            isColliding = false;
        }

        public void LoadContent(ContentManager Content)
        {
            texture = Content.Load<Texture2D>("Player");
        }

        public void Draw(SpriteBatch spriteBatch)
        {
            spriteBatch.Draw(texture, position, Color.White); //THE ERROR IS HERE.
        }


        public void Update(GameTime gameTime)
        {

        }
    }
}

Answer 1

我认为您的问题可能是您从未致电Player.LoadContent()。由于您没有从Game1.LoadContent()调用此内容，因此永远不会加载纹理，这是导致错误的原因。要解决您的问题，您可以尝试这样的事情：

在Game1中

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
            player.LoadContent(Content);
        }

这将调用你的播放器类中的LoadContent void，这是我认为你最初想到的会自动发生的。不会像Game1 LoadContent()那样自动调用LoadContent，因为Player只是一个普通类，并且不会继承其他类，例如Game1。

此方法不接受此参数的null。但在我看来，纹理被编程为加载？

1 个答案: