source: binary-improvements/CoppisAdditions/src/Commands/ListPlayersFriends.cs@ 279

using System;
using System.Collections.Generic;
using System.Reflection;

namespace CoppisAdditions.CustomCommands
{
        public class ListPlayersFriends : ConsoleCmdAbstract
        {
                public override string GetDescription ()
                {
                        return "list friends of a single player or all players";
                }

                public override string GetHelp ()
                {
                        return "Usage:\n" +
                        "  1. lpf <steam id / player name / entity id>" +
                        "  2. lpf (to list all players friends)";
                }

                public override string[] GetCommands ()
                {
                        return new string[] { "listplayerfriends", "lpf" };
                }

                public override void Execute (List<string> _params, CommandSenderInfo _senderInfo)
                {
                        try {
                                if (_params.Count > 1) {
                                        SdtdConsole.Instance.Output ("Usage: listplayerfriends <entityid|playername|steamid> or listplayerfriends");
                                } else {
                                        if (_params.Count == 0) {
                                                Dictionary<int, EntityPlayer>.Enumerator playerEnum = GameManager.Instance.World.Players.dict.GetEnumerator ();
                                                while (playerEnum.MoveNext ()) {
                                                        try {
                                                                KeyValuePair<int, EntityPlayer> pair = playerEnum.Current;
                                                                ClientInfo ci1 = ConsoleHelper.ParseParamIdOrName (pair.Value.entityId.ToString ());
                                                                PersistentPlayerData data = GameManager.Instance.persistentPlayers.GetPlayerData (ci1.playerId);
                                                                HashSet<string>.Enumerator enumeratorFriends = data.ACL.GetEnumerator ();
                                                                String friends = "";
                                                                while (enumeratorFriends.MoveNext ()) {
                                                                        string str = enumeratorFriends.Current;
                                                                        if (str != null) {
                                                                                if (!friends.Equals ("")) {
                                                                                        friends += ",";
                                                                                }
                                                                                friends += str;
                                                                        }
                                                                }
                                                                SdtdConsole.Instance.Output ("FriendsOf id=" + pair.Value.entityId + ", friends=" + friends);
                                                        } catch (Exception e) {
                                
                                                        }
                                                }
                                        } else { 
                                                ClientInfo ci = ConsoleHelper.ParseParamIdOrName (_params [0]);
                                                if (ci == null) {
                                                        SdtdConsole.Instance.Output ("Playername or entity/steamid id not found.");
                                                        return;
                                                }
                                                EntityPlayer ep = GameManager.Instance.World.Players.dict [ci.entityId];
                                                PersistentPlayerData data = GameManager.Instance.persistentPlayers.GetPlayerDataFromEntityID (ci.entityId);

                                                HashSet<string>.Enumerator enumerator = data.ACL.GetEnumerator ();
                                                //int count = 0;
                                                String friends = "";
                                                while (enumerator.MoveNext ()) {
                                                        string str = enumerator.Current;
                                                        if (!friends.Equals ("")) {
                                                                friends += ",";
                                                        }
                                                        friends += str;
                           
                                                        //Player p = PersistentContainer.Instance.Players[str, false];
                                                        //if (p == null)
                                                        //{
                                                        //  continue;
                                                        //}
                                                        //count++;
                                                        //SdtdConsole.Instance.Output(count + ": " + p.EntityID + " - " + p.Name);
                                                }
                                                SdtdConsole.Instance.Output ("FriendsOf id=" + ci.entityId + ", friends=" + friends);
                                        }
                                }
                        } catch (Exception e) {
                                Log.Out ("Error in ListPlayersFriends.Run: " + e);
                        }
                }
        }
}