source: binary-improvements/7dtd-server-fixes/src/PersistentData/PersistentContainer.cs@ 143

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

namespace AllocsFixes.PersistentData
{
        [Serializable]
        public class PersistentContainer
        {
                public Dictionary<string, KnownPlayers> players = new Dictionary<string, KnownPlayers> ();
                private static PersistentContainer instance;

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

                private PersistentContainer ()
                {
                        Log.Out ("new PersistentContainer()");
                }

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

                public static bool Load ()
                {
                        if (File.Exists (StaticDirectories.GetSaveGameDir () + "/AllocsPeristentData.bin")) {
                                PersistentContainer obj;
                                Stream stream = File.Open (StaticDirectories.GetSaveGameDir () + "/AllocsPeristentData.bin", FileMode.Open);
                                BinaryFormatter bFormatter = new BinaryFormatter ();
                                obj = (PersistentContainer)bFormatter.Deserialize (stream);
                                stream.Close ();
                                instance = obj;
                                return true;
                        } else
                                return false;
                }

        }
}