C#•11mo ago

✅ How to force C# to copy data?

I am trying to debug code and I have a list of rooms and another list of backup_rooms. They both get initialized at the same time, but when I need use backup room I find that is has changed (It is never used in code). My guess is, that a reference is created to an object rather than a copy of it. So how to force C# to copy?

7 Replies

Jimmacle•11mo ago

do you have an example of your code? in general yes, reference types (classes) work similarly to passing pointers around in C/C++

arch_ilOP•11mo ago

public static void ReloadRooms()
    {
        using (System.IO.StreamReader sr = new System.IO.StreamReader("Rooms.json"))
            {
                GlobalValues.rooms.Clear();
                
                var data = JsonSerializer
                    .Deserialize<JsonReceiver>(
                        sr.ReadToEnd(), 
                        new JsonSerializerOptions { IncludeFields = true }
                    ).ParseData();

                checkpoints = data.Item1;
                rooms = backup_rooms = data.Item2;                
            }
    }

public static void ReloadRooms()
    {
        using (System.IO.StreamReader sr = new System.IO.StreamReader("Rooms.json"))
            {
                GlobalValues.rooms.Clear();
                
                var data = JsonSerializer
                    .Deserialize<JsonReceiver>(
                        sr.ReadToEnd(), 
                        new JsonSerializerOptions { IncludeFields = true }
                    ).ParseData();

                checkpoints = data.Item1;
                rooms = backup_rooms = data.Item2;                
            }
    }

Jimmacle•11mo ago

so if you're creating a room and adding it to both lists, they're referencing the same room object

arch_ilOP•11mo ago

is there a function for creating a deep copy of an object or do I have to make a new object myself?

Jimmacle•11mo ago

you have to make a copy yourself, there's no built in function for that because exactly what a "deep copy" is depends on the object

arch_ilOP•11mo ago

this is the part where the reference is created. thanks

Mkp•11mo ago

I would use copy constructors to aid you in your quest

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✅ How to force C# to copy data?