source: binary-improvements/7dtd-server-fixes/src/PersistentData/Player.cs@ 200

using System;
using System.Runtime.Serialization;
using UnityEngine;

namespace AllocsFixes.PersistentData
{
        [Serializable]
        public class Player
        {
                private readonly string steamId;
                private int entityId;
                private string name;
                private string ip;
                private long totalPlayTime;
                [OptionalField]
                private DateTime
                        lastOnline;
                private Inventory inventory;
                [OptionalField]
                private int
                        lastPositionX, lastPositionY, lastPositionZ;
                [NonSerialized]
                private ClientInfo
                        clientInfo;

                public string SteamID {
                        get { return steamId; }
                }

                public int EntityID {
                        get { return entityId; }
                }

                public string Name {
                        get { return name == null ? string.Empty : name; }
                }

                public string IP {
                        get { return ip == null ? string.Empty : ip; }
                }

                public Inventory Inventory {
                        get {
                                if (inventory == null)
                                        inventory = new Inventory ();
                                return inventory;
                        }
                }

                public bool IsOnline {
                        get { return clientInfo != null; }
                }

                public ClientInfo ClientInfo {
                        get { return clientInfo; }
                }

                public EntityPlayer Entity {
                        get {
                                if (IsOnline) {
                                        return CommonMappingFunctions.GetEntityPlayer (clientInfo);
                                } else {
                                        return null;
                                }
                        }
                }

                public long TotalPlayTime {
                        get {
                                if (IsOnline) {
                                        return totalPlayTime + (long)(Time.timeSinceLevelLoad - Entity.CreationTimeSinceLevelLoad);
                                } else {
                                        return totalPlayTime;
                                }
                        }
                }

                public DateTime LastOnline {
                        get {
                                if (IsOnline)
                                        return DateTime.Now;
                                else
                                        return lastOnline;
                        }
                }

                public Vector3i LastPosition {
                        get {
                                if (IsOnline)
                                        return new Vector3i (Entity.GetPosition ());
                                else
                                        return new Vector3i (lastPositionX, lastPositionY, lastPositionZ);
                        }
                }

                public void SetOffline ()
                {
                        if (clientInfo != null) {
                                Log.Out ("Player set to offline: " + steamId);
                                lastOnline = DateTime.Now;
                                try {
                                        Vector3i lastPos = new Vector3i (Entity.GetPosition ());
                                        lastPositionX = lastPos.x;
                                        lastPositionY = lastPos.y;
                                        lastPositionZ = lastPos.z;
                                        totalPlayTime += (long)(Time.timeSinceLevelLoad - Entity.CreationTimeSinceLevelLoad);
                                } catch (NullReferenceException) {
                                        Log.Out ("Entity not available. Something seems to be wrong here...");
                                }
                                clientInfo = null;
                        }
                }

                public void SetOnline (ClientInfo ci)
                {
                        Log.Out ("Player set to online: " + steamId);
                        clientInfo = ci;
                        entityId = CommonMappingFunctions.GetEntityID (ci);
                        name = CommonMappingFunctions.GetPlayerName (ci);
                        ip = ci.networkPlayer.ipAddress;
                }

                public Player (string steamId)
                {
                        this.steamId = steamId;
                        this.inventory = new Inventory ();
                }


        }
}