source: binary-improvements/7dtd-server-fixes/src/PersistentData/PersistentContainer.cs@ 300

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 (GameUtils.GetSaveGameDir () + "/AllocsPeristentData.bin", FileMode.Create);
                        BinaryFormatter bFormatter = new BinaryFormatter ();
                        bFormatter.Serialize (stream, this);
                        stream.Close ();
                }

                public static bool Load ()
                {
                        if (File.Exists (GameUtils.GetSaveGameDir () + "/AllocsPeristentData.bin")) {
                                try {
                                        PersistentContainer obj;
                                        Stream stream = File.Open (GameUtils.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;
                }

        }
}