Unity - 向二进制格式的保存数据添加新变量？

Question

我使用二进制格式化程序来保存用户数据，其中包括一堆嵌套的 classes 和参数。当我需要向任何 class 添加新参数时，对于来自以前版本的用户，游戏会加载损坏的 data/no 数据。

我尝试在加载后对新变量进行 null 检查，如果它为 null 但它不是修复，则从默认数据复制。游戏没有崩溃，但用户数据中的所有价格和等级都丢失了。

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

通过了解您的保存文件版本，您可以轻松确定是否尝试解码给定值。

如果您没有，请添加一个。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。

如果您使用保存版本，您可以先将其读出，然后查询它以查看会发生什么：从二进制数据中读取值或将其设置为默认值。即 way, way easier.

Unity - 向二进制格式的保存数据添加新变量？

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使用保存格式值