fCraft.PlayerDB.FindByPartialNameOrPrintMatches C# (CSharp) Method

        public static PlayerInfo FindByPartialNameOrPrintMatches( [NotNull] Player player, [NotNull] string partialName ) {
            if( player == null ) throw new ArgumentNullException( "player" );
            if( partialName == null ) throw new ArgumentNullException( "partialName" );
            CheckIfLoaded();
            if( partialName == "-" ) {
                if( player.LastUsedPlayerName != null ) {
                    partialName = player.LastUsedPlayerName;
                } else {
                    player.Message( "Cannot repeat player name: you haven't used any names yet." );
                    return null;
                }
            }
            if( !Player.ContainsValidCharacters( partialName ) ) {
                player.MessageInvalidPlayerName( partialName );
                return null;
            }
            PlayerInfo target = FindExact( partialName );
            if( target == null ) {
                PlayerInfo[] targets = FindByPartialName( partialName ).ToArray();
                if( targets.Length == 0 ) {
                    player.MessageNoPlayer( partialName );
                    return null;

                } else if( targets.Length > 1 ) {
                    Array.Sort( targets, new PlayerInfoComparer( player ) );
                    player.MessageManyMatches( "player", targets );
                    return null;
                }
                target = targets[0];
            }
            player.LastUsedPlayerName = target.Name;
            return target;
        }

        static void InfoSwapHandler(Player player, CommandReader cmd)
        {
            string p1Name = cmd.Next();
            string p2Name = cmd.Next();

            if (p1Name == null || p2Name == null)
            {
                CdInfoSwap.PrintUsage(player);
                return;
            }

            PlayerInfo p1 = PlayerDB.FindByPartialNameOrPrintMatches(player, p1Name);

            if (p1 == null)
            {
                return;
            }
            PlayerInfo p2 = PlayerDB.FindByPartialNameOrPrintMatches(player, p2Name);

            if (p2 == null)
            {
                return;
            }

            if (p1 == p2)
            {
                player.Message("InfoSwap: Please specify 2 different players.");
                return;
            }

            if (p1.IsOnline || p2.IsOnline)
            {
                player.Message("InfoSwap: Both players must be offline to swap info.");
                return;
            }

            if (!cmd.IsConfirmed)
            {
                player.Confirm(cmd, "InfoSwap: Swap stats of players {0}&S and {1}&S?", p1.ClassyName, p2.ClassyName);
            }
            else
            {
                PlayerDB.SwapPlayerInfo(p1, p2);
                player.Message("InfoSwap: Stats of {0}&S and {1}&S have been swapped.",
                               p1.ClassyName, p2.ClassyName);
            }
        }