How to load object data saved in Unity C#? - unity3d

Question

I want to create a universal storage system in Unity C#.
What my code not work? Object can't define or did I write wrong?
If not use functions from SaveExtensions then everything will work.
https://drive.google.com/open?id=1hLFRB2rHj7XcJT6et7TskEa7sLwdmJhP

Answer 1

While your saving works the problem is in your Load method.
obj = bf.Deserialize(fs);
this change is only applied locally inside the method but it doesn't actually change the value of the calling ex in
ex.Load("asd", ".dat", SaveExtension.Path.PersistentDataPath);
Unfortuanetly ref and out are not allowed in extension methods so one workaround might be giving the method a proper return value instead (I also made some changes to the rest of your code):
[System.Serializable]
internal static class SaveExtension
{
public enum Path
{
PersistentDataPath,
TemporaryCachePath
}
public static void Save(this object obj, string name, string type, Path path)
{
var pathString = "";
switch (path)
{
case Path.PersistentDataPath:
pathString = Application.persistentDataPath;
break;
case Path.TemporaryCachePath:
pathString = Application.temporaryCachePath;
break;
}
// There is no need to create the file
// in a dedicated if block since it will be created anyway
// Additionally: You did only create a new file but due to
// if-else you didn't write to it the first time
Debug.Log("[SaveSystem]: File " + name + type + " already exist!");
Debug.Log("[SaveSystem]: Location: " + pathString + "/" + name + type);
var bf = new BinaryFormatter();
using (var fs = File.Open(pathString + "/" + name + type, FileMode.Open, FileAccess.Write))
{
bf.Serialize(fs, obj);
}
Debug.Log("[SaveSystem]: Object succesful serialized!");
}
public static T Load<T>(this T obj, string name, string type, Path path)
{
var output = default(T);
var pathString = "";
switch (path)
{
case Path.PersistentDataPath:
pathString = Application.persistentDataPath;
break;
case Path.TemporaryCachePath:
pathString = Application.temporaryCachePath;
break;
}
if (!File.Exists(pathString + "/" + name + type))
{
Debug.LogFormat("File " + pathString + "/" + name + type + " not found! returning default value.");
return output;
}
var bf = new BinaryFormatter();
using (var fs = File.Open(pathString + "/" + name + type, FileMode.Open))
{
output = (T)bf.Deserialize(fs);
}
Debug.Log("[SaveSystem]: Object succesful deserialized!");
return output;
}
}
and use it like
ex = ex.Load("asd", ".dat", SaveExtension.Path.PersistentDataPath);
This way the this T obj is only used to define the type T
Just a hint: You should never use Debug.Log inside of Update ... for debugging simply switch the Inspector in Unity to the Debug mode than you can directly see private fields.