source: binary-improvements/7dtd-server-fixes/src/PersistentData/PersistentContainer.cs@ 442

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 {
                        get {
                                if (players == null) {
                                        players = new Players ();
                                }

                                return players;
                        }
                }

                public Attributes Attributes {
                        get {
                                if (attributes == null) {
                                        attributes = new Attributes ();
                                }

                                return attributes;
                        }
                }

                private static PersistentContainer instance;

                public static PersistentContainer Instance {
                        get {
                                if (instance == null) {
                                        instance = new PersistentContainer ();
                                }

                                return instance;
                        }
                }

                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 {
                                PersistentContainer obj;
                                Stream stream = File.Open (GameIO.GetSaveGameDir () + "/AllocsPeristentData.bin", FileMode.Open);
                                BinaryFormatter bFormatter = new BinaryFormatter ();
                                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;
                }
        }
}