未添加到列表中的项目[重复]

我有定制课程 Map 其中包含2个自定义类列表 Bricks 和 Dangers . 问题是我的代码并没有向那个自定义类添加元素。

public class Map
{
    public string mapName;
    public List<Brick> bricks;
    public List<Danger> dangers;

    public Map()
    {
        bricks = new List<Brick>();
        dangers = new List<Danger>();
    }
}

public class Brick
{
    public Vector2 Position;
}

public class Danger
{
    public Vector2 Position;
}
private void CreateMap()
{
    Map map = new Map();
    map.mapName = "test";

    map.bricks.Add(new Brick { Position = new Vector2(1, 1) });
    map.bricks.Add(new Brick { Position = new Vector2(2, 1) });
    map.bricks.Add(new Brick { Position = new Vector2(5, 1) });
    map.bricks.Add(new Brick { Position = new Vector2(6, 1) });
    map.bricks.Add(new Brick { Position = new Vector2(7, 1) });

    map.dangers.Add(new Danger { Position = new Vector2(3, 1) });
    map.dangers.Add(new Danger { Position = new Vector2(4, 1) });

    Debug.Log(JsonUtility.ToJson(map));
    AddMap(map);
}

Debug.Log 我明白了 {"mapName:": "test"}