在Monogame中加载内容时出现ArgumentNullException

Question

I can't load textures I don't know why since my code is pretty straightforward.

namespace Rogue_Like_LOL
{
    public class Game1 : Game
    {
        GraphicsDeviceManager graphics;
        ScreenManager screenManager;

        public Game1()
            :base()
        {

            graphics = new GraphicsDeviceManager(this);
            graphics.PreferredBackBufferHeight = 720;
            graphics.PreferredBackBufferWidth = 1280;
            Content.RootDirectory = "Content";

            Art.Load(Content);
        }
    }
}

And the Art.cs :

    namespace Rogue_Like_LOL
    {
        static class Art
        {
            public static Texture2D Player { get; private set; }
            public static Texture2D PlayGame { get; private set; }
            public static Texture2D Exit { get; private set; }

            public static SpriteFont GameFont { get; private set; }

            public static void Load(ContentManager content)
            {
                // Player etc
                PlayGame = content.Load<Texture2D>("playgame");
                Exit = content.Load<Texture2D>("exit");

            }

    }

Here are the Exception details :

System.ArgumentNullException was unhandled HResult=-2147467261
Message=La valeur ne peut pas être null. Nom du paramètre : Graphics Device Cannot Be Null Source=MonoGame.Framework ParamName=Graphics Device Cannot Be Null StackTrace: à Microsoft.Xna.Framework.Graphics.Texture2D..ctor(GraphicsDevice graphicsDevice, Int32 width, Int32 height, Boolean mipmap, SurfaceFormat format, SurfaceType type, Boolean shared, Int32 arraySize) à Microsoft.Xna.Framework.Graphics.Texture2D..ctor(GraphicsDevice graphicsDevice, Int32 width, Int32 height) à Microsoft.Xna.Framework.Graphics.Texture2D.PlatformFromStream(GraphicsDevice graphicsDevice, Stream stream) à Microsoft.Xna.Framework.Graphics.Texture2D.FromStream(GraphicsDevice graphicsDevice, Stream stream) à Microsoft.Xna.Framework.Content.ContentManager.ReadRawAsset[T](String assetName, String originalAssetName) à Microsoft.Xna.Framework.Content.ContentManager.ReadAsset[T](String assetName, Action`1 recordDisposableObject) à Microsoft.Xna.Framework.Content.ContentManager.Load[T](String assetName) à Rogue_Like_LOL.Art.Load(ContentManager conte nt) dans c:\\Users\\Monique Dumont\\Programmation\\Rogue Like LOL\\Rogue Like LOL\\Art Manager\\Art.cs:ligne 22 à Rogue_Like_LOL.Game1..ctor() dans c:\\Users\\Monique Dumont\\Programmation\\Rogue Like LOL\\Rogue Like LOL\\Game1.cs:ligne 34 à Rogue_Like_LOL.Program.Main() dans c:\\Users\\Monique Dumont\\Programmation\\Rogue Like LOL\\Rogue Like LOL\\Program.cs:ligne 17 à System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args) à System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args) à Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly() à System.Threading.ThreadHelper.ThreadStart_Context(Object state) à System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) à System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) à System.Threading.ExecutionContext.Run(E xecutionContext executionContext, ContextCallback callback, Object state) à System.Threading.ThreadHelper.ThreadStart() InnerException:

Thanks for your attention.

Answer 1

I suggest you to load your content after the content manager is ready to be used. I am not sure if this would solve your problem, but it seems like a possible issue to me.

To do so:

protected override void LoadContent()
{
    Art.Load(Content);
}