如果不存在从反序列化文件中获取值的问题

Question

我目前正在尝试设置一个“firstRun”布尔值，以仅在第一次启动应用程序时运行一段代码。

游戏数据文件

[System.Serializable]
 public class GameData
 {
     
     public static string saveFileName = "Pixel.pixel";
 
     public double money;
     public bool firstRun;
 
     public GameData()
     {
         money = GameController.Instance.CurrentCash;
     }
 }

保存系统文件

 using System.IO;
 using System.Runtime.Serialization.Formatters.Binary;
 
 public static class SaveSystem
 {
 
     public static void SaveData()
     {
         BinaryFormatter formatter = new BinaryFormatter();
 
         string path = Application.persistentDataPath + "/" + GameData.saveFileName;
         FileStream stream = new FileStream(path, FileMode.Create);
 
         GameData data = new GameData();
         formatter.Serialize(stream, data);
 
         stream.Close();
     }
 
     public static GameData LoadData()
     {
         string path = Application.persistentDataPath + "/" + GameData.saveFileName;
         if (File.Exists(path))
         {
             BinaryFormatter formatter = new BinaryFormatter();
             
             FileStream stream = new FileStream(path, FileMode.Open);
 
             GameData data = formatter.Deserialize(stream) as GameData;
             
             stream.Close();
 
             return data;
         }
         else
         {
             return null;
         }
     }
 }

GameController.cs 部分

 public void Start()
     {
         Setup(START_CASH);
         /*AddCash(START_CASH);*/
     }
 
     private void Setup(double value)
     {
         GameData data = SaveSystem.LoadData();
         if (!data.firstRun)
         {
             CurrentCash += value;
             SaveSystem.SaveData();
         }
         else
         {
             CurrentCash = data.money;
             SaveSystem.SaveData();
         }
         UI.CashDisplay.text = ShortScaleString.parseDouble(CurrentCash, 1, 1000, scientificFormat);
     }

我的问题是我需要检查“data.firstRun”是否为假/不存在来运行设置部分，但我真的不知道如何实现

Answer 1

您应该只返回一个新的“GameData”，带有您喜欢的值（true 或 false）：

public static GameData LoadData()
{
    string path = Application.persistentDataPath + "/" + GameData.saveFileName;
    if (File.Exists(path))
    {
        BinaryFormatter formatter = new BinaryFormatter();

        FileStream stream = new FileStream(path, FileMode.Open);

        GameData data = formatter.Deserialize(stream) as GameData;

        stream.Close();

        return data;
    }
    else
    {
        return new GameData { firstRun = true };
    }
}