source: binary-improvements2/7dtd-server-fixes/src/PersistentData/PersistentContainer.cs@ 402

using System;
using System.IO;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters.Binary;

namespace AllocsFixes.PersistentData {
        [Serializable]
        public class PersistentContainer {
                private Players players;
                [OptionalField] private Attributes attributes;

                public Players Players => players ?? (players = new Players ());

                public Attributes Attributes => attributes ?? (attributes = new Attributes ());

                private static PersistentContainer instance;

                public static PersistentContainer Instance => instance ?? (instance = new PersistentContainer ());

                private PersistentContainer () {
                }

                public void Save () {
                        Stream stream = File.Open ($"{GameIO.GetSaveGameDir ()}/AllocsPeristentData.bin", FileMode.Create);
                        BinaryFormatter bFormatter = new BinaryFormatter ();
                        bFormatter.Serialize (stream, this);
                        stream.Close ();
                }

                public static bool Load () {
                        if (!File.Exists ($"{GameIO.GetSaveGameDir ()}/AllocsPeristentData.bin")) {
                                return false;
                        }

                        try {
                                Stream stream = File.Open ($"{GameIO.GetSaveGameDir ()}/AllocsPeristentData.bin", FileMode.Open);
                                BinaryFormatter bFormatter = new BinaryFormatter ();
                                PersistentContainer obj = (PersistentContainer) bFormatter.Deserialize (stream);
                                stream.Close ();
                                instance = obj;
                                return true;
                        } catch (Exception e) {
                                Log.Error ("Exception in PersistentContainer.Load");
                                Log.Exception (e);
                        }

                        return false;
                }
        }
}