由Foreach引起的巨型红色X Winform / MonoGames

Question

到目前为止，我向foreach语句下去，这导致了巨大的红色X.即使我/*评论一切都期望构造者。我不明白为什么foreach会在我的应用程序中创建所有问题。

public class Map
{
    [XmlElement("Layer")]
    public List<Layer> Layers;
    public Vector2 TileDimensions;

    public void Initialize(ContentManager content)
    {
        foreach (Layer l in Layers)
            l.Initialize(content, TileDimensions);
    }

    public void Draw(SpriteBatch spriteBatch)
    {
        foreach (Layer l in Layers) //This is causing the problems
            l.Draw(spriteBatch); 
    }
  }
}

Layer类是

public class Layer
{
  /*  public class TileMap // For some reason it still gets the giant red X even know it commented out.
    {
        [XmlElement("Row")]
        public List<string> Row;
    }

    Vector2 tileDimensions;
    [XmlElement("TileMap")]
    List<List<Vector2>> tileMap;

    TileMap tileLayout = new TileMap();

    public Image image;

   public Layer()
    {
        tileDimensions = new Vector2();
        tileMap = new List<List<Vector2>>();
    }
    */
    public void Initialize(ContentManager content, Vector2 tileDimensions)
    {
       /* foreach (string row in tileLayout.Row)
        {
            string[] split = row.Split(']');
            List<Vector2> tempTileMap = new List<Vector2>();
            foreach (string s in split)
            {
                int value1, value2;
                if (s != String.Empty && !s.Contains('x'))
                {
                    string str = s.Replace("[", String.Empty);
                    value1 = int.Parse(str.Substring(0, str.IndexOf(':')));
                    value2 = int.Parse(str.Substring(str.IndexOf(':') + 1));
                }
                else
                    value1 = value2 = -1;
                tempTileMap.Add(new Vector2(value1, value2));
            }
            tileMap.Add(tempTileMap);
        }
        image.Initialize(content);
        this.tileDimensions = tileDimensions;*/
    }

    public void Draw(SpriteBatch spriteBatch)
    { 
      /*  for (int i = 0; i < tileMap.Count; i++)
        {
            for (int j = 0; j < tileMap[i].Count; j++)
            {
               if (tileMap[i][j] != -Vector2.One)
                {
                    image.position = new Vector2(j* tileDimensions.X, i* tileDimensions.Y);
                    image.SourceRect = new Rectangle((int)(tileMap[i][j].X * tileDimensions.X),
                        (int)(tileMap[i][j].Y * tileDimensions.Y), (int)tileDimensions.X, 
                        (int)tileDimensions.Y);
                    image.Draw(spriteBatch);
                }
            }
         }*/
       }
    }
  }

为什么foreach循环会显示Giant Red X？我需要该功能使Map显示部分工作，所以我可以编辑地图。所以非常重要。我创建了另一个帖子，在我发现foreach循环打破它之前。我希望有人可以帮我解决这个问题。我花了3天时间试着理解它为什么会破碎。