Unity -将新变量添加到二进制格式的保存数据？

Question

我使用二进制格式化程序保存用户数据，其中包括一堆嵌套的类和参数。当我需要向任何类添加新参数时，游戏会加载损坏的数据/对于来自以前版本的用户根本没有数据。

我尝试在加载后检查新变量，如果默认数据为空但不能修复，则从默认数据复制。游戏不会崩溃，但用户数据中的所有价格和关卡都会丢失。

public void Load()
{
    GameData = new GameDataModel();

    if (File.Exists(GameFilePath + "/" + GameFileName))
    {
        var bf = new BinaryFormatter();
        var file = File.Open(GameFilePath + "/" + GameFileName, FileMode.Open);
        var gameData = (GameDataModel)bf.Deserialize(file);
        file.Close();

        if (string.IsNullOrEmpty(gameData.WorldName))
        {
            GameData = CreateDefaultGameData();
        }
        else
        {
            GameData = gameData;
        }
    }
    else
    {
        GameData = CreateDefaultGameData();
    }

    for (int i = 0; i < GameData.Cities.Count; i++)
    {
        if (GameData.Cities[i].FoodStall == null)
            GameData.Cities[i].FoodStall = CreateDefaultGameData().Cities[i].FoodStall;
        if (GameData.Cities[i].Billboard == null)
            GameData.Cities[i].Billboard = CreateDefaultGameData().Cities[i].Billboard;
        if (GameData.Cities[i].Trees == null)
            GameData.Cities[i].Trees = CreateDefaultGameData().Cities[i].Trees;
        if (GameData.Cities[i].Decorations == null)
            GameData.Cities[i].Decorations = CreateDefaultGameData().Cities[i].Decorations;
        if (GameData.Cities[i].Station.StationBuildingTypeCosts == null)
            GameData.Cities[i].Station.StationBuildingTypeCosts = CreateDefaultGameData().Cities[i].Station.StationBuildingTypeCosts;
        if (GameData.Cities[i].Station.StationBuildingType == 0)
            GameData.Cities[i].Station.StationBuildingTypeCosts = CreateDefaultGameData().Cities[i].Station.StationBuildingTypeCosts;
        if (GameData.Cities[i].Station.CapacityMultiplier == 0)
            GameData.Cities[i].Station.CapacityMultiplier = 1;
        if (GameData.Cities[i].People.DensityMultiplier == 0)
            GameData.Cities[i].People.DensityMultiplier = 1;
        if (GameData.Cities[i].Bus.ProfitMultiplier == 0)
            GameData.Cities[i].Bus.ProfitMultiplier = 1;

        GameData.Cities[i].Station.Parameters = DefaultGameData.Cities[i].Station.Parameters;
        GameData.Cities[i].Bus.Parameters = DefaultGameData.Cities[i].Bus.Parameters;
        GameData.Cities[i].People.Parameters = DefaultGameData.Cities[i].People.Parameters;
    }
}

我希望以前版本的用户保留他们的数据，并拥有新变量的默认数据。您将如何处理向现有序列化数据添加新数据？

Answer 1

使用保存格式值

通过了解保存文件的版本，您可以很容易地确定是否尝试解码给定值。

如果你没有，那就添加一个。否则你将不得不这样做：

public static void deserialize(ref SerializationInfo info, ref StreamingContext context) {
    SerializationInfoEnumerator infoEnum = info.GetEnumerator();
    Hashtable values = new Hashtable();
    while(infoEnum.MoveNext()) {
        SerializationEntry val = infoEnum.Current;
        values.Add(val.Name, val.Value);
    }
    ...
}

然后使用哈希表来确定给定值是否存在。

如果您使用的是保存版本，您可以先读出它，然后查询它，看看会发生什么:从二进制数据中读出值或将其设置为默认值。那就是way, way easier。