有可能,您的防火墙正在阻止这种情况(您可能没有运行IDENTD服务器).这不是一个大问题,尽管一个成熟的IRC客户端将实现它.你可以找到更多的here.这更详细.实施起来相对简单.

大多数IRC服务器都会放弃,如果它无法连接到你,我已经忘记了它的确切副作用(它已经有一段时间了),但你想要注意的下一条消息是MOTD_START / MOTD / MOTD_END和ERR_NOMOTD.只有在收到当天消息的结尾或处理了ERR_NOMOTD(没有一个)之后,才能使用JOIN加入频道.

顺便提一下,这是一个很好的RegEx,用于匹配来自IRC服务器的输入：

^(?:[:@]([^\\s]+) )?([^\\s]+)(?: ((?:[^:\\s][^\\s]* ?)*))?(?: ?:(.*))?$

IRC RFC列出了所有可能的代码及其含义.我不确定你为什么认为它们毫无用处.你引用了哪些？

编辑

我查找了我的旧C代码以获取IRC,这样我可以更有帮助.连接后,它进入一个阶段(我已经标记)谈判：

谈判阶段：

>如果已为服务器指定了密码,请将其发送给PASS mypassword.
>发送USER命令.
>输入Negotiate Nickname Stage
>等待ERR_NOMOTD,END_OFMOTD.直到其中一个出现,你才“正式联系”.

谈判昵称阶段：

完全可能在连接期间,您要使用的昵称已被使用.因此,客户应该：

>发出NICK命令
>如果收到ERR_NICKINUSE响应,请再次发出.如果您没有更多的昵称可供使用,您可以救助或提示用户另一个昵称.

还有一些需要考虑的事情：

>查看我们的PING命令.当您闲置时,服务器将发送此信息.将此处理为高优先级,并使用服务器提供给您的数据返回PONG.如果不这样做将确保您断开连接,当您测试IRC客户端时,这可能是后端的痛苦.

奖金乐趣

这是我对IRC命令的枚举,你应该能够很容易地把它放到C#中：

// reply ids
    enum Reply
    {
        RplNone             = 0,// Initial
        RplWelcome          = 001,// :Welcome to the Internet Relay Network <nickname>
        RplYourHost         = 002,// :Your host is <server>,running version <ver>
        RplCreated          = 003,// :This server was created <datetime>
        RplMyInfo           = 004,// <server> <ver> <usermode> <chanmode>
        RplMap              = 005,// :map
        RplEndOfMap         = 007,// :End of /MAP
        RplMotdStart        = 375,// :- server Message of the Day
        RplMotd             = 372,// :- <info>
        RplMotdAlt          = 377,// :- <info>                                                                        (some)
        RplMotdAlt2         = 378,// :- <info>                                                                        (some)
        RplMotdEnd          = 376,// :End of /MOTD command.
        RplUModeIs          = 221,// <mode>

        // IsOn/UserHost
        RplUserHost         = 302,// :userhosts
        RplIsOn             = 303,// :nicknames

        // Away
        RplAway             = 301,// <nick> :away
        RplUnAway           = 305,// :You are no longer marked as being away
        RplNowAway          = 306,// :You have been marked as being away

        // WHOIS/WHOWAS
        RplWhoisHelper      = 310,// <nick> :looks very helpful                                                       DALNET
        RplWhoIsUser        = 311,// <nick> <username> <address> * :<info>
        RplWhoIsServer      = 312,// <nick> <server> :<info>
        RplWhoIsOperator    = 313,// <nick> :is an IRC Operator
        RplWhoIsIdle        = 317,// <nick> <seconds> <signon> :<info>
        RplEndOfWhois       = 318,// <request> :End of /WHOIS list.
        RplWhoIsChannels    = 319,// <nick> :<channels>
        RplWhoWasUser       = 314,// <nick> <username> <address> * :<info>
        RplEndOfWhoWas      = 369,// <request> :End of WHOWAS
        RplWhoReply         = 352,// <channel> <username> <address> <server> <nick> <flags> :<hops> <info>
        RplEndOfWho         = 315,// <request> :End of /WHO list.
        RplUserIPs          = 307,// :userips                                                                         UNDERNET
        RplUserIP           = 340,// <nick> :<nickname>=+<user>@<IP.address>                                          UNDERNET

        // List
        RplListStart        = 321,// Channel :Users Name
        RplList             = 322,// <channel> <users> :<topic>
        RplListEnd          = 323,// :End of /LIST
        RplLinks            = 364,// <server> <hub> :<hops> <info>
        RplEndOfLinks       = 365,// <mask> :End of /LINKS list.

        // Post-Channel Join
        RplUniqOpIs         = 325,RplChannelModeIs    = 324,// <channel> <mode>
        RplChannelUrl       = 328,// <channel> :url                                                                   DALNET
        RplChannelCreated   = 329,// <channel> <time>
        RplNoTopic          = 331,// <channel> :No topic is set.
        RplTopic            = 332,// <channel> :<topic>
        RplTopicSetBy       = 333,// <channel> <nickname> <time>
        RplNamReply         = 353,// = <channel> :<names>
        RplEndOfNames       = 366,// <channel> :End of /NAMES list.

        // Invitational
        RplInviting         = 341,// <nick> <channel>
        RplSummoning        = 342,// Channel Lists
        RplInviteList       = 346,// <channel> <invite> <nick> <time>                                                 IRCNET
        RplEndOfInviteList  = 357,// <channel> :End of Channel Invite List                                            IRCNET
        RplExceptList       = 348,// <channel> <exception> <nick> <time>                                              IRCNET
        RplEndOfExceptList  = 349,// <channel> :End of Channel Exception List                                         IRCNET
        RplBanList          = 367,// <channel> <ban> <nick> <time>
        RplEndOfBanList     = 368,// <channel> :End of Channel Ban List


        // server/misc
        RplVersion          = 351,// <version>.<debug> <server> :<info>
        RplInfo             = 371,// :<info>
        RplEndOfInfo        = 374,// :End of /INFO list.
        RplYoureOper        = 381,// :You are now an IRC Operator
        RplRehashing        = 382,// <file> :Rehashing
        RplYoureService     = 383,RplTime             = 391,// <server> :<time>
        RplUseRSStart       = 392,RplUsers            = 393,RplEndOfUsers       = 394,RplNoUsers          = 395,RplServList         = 234,RplServListEnd      = 235,RplAdminMe          = 256,// :Administrative info about server
        RplAdminLoc1        = 257,// :<info>
        RplAdminLoc2        = 258,// :<info>
        RplAdminEMail       = 259,// :<info>
        RplTryAgain         = 263,// :Server load is temporarily too heavy. Please wait a while and try again.

        // tracing
        RplTraceLink        = 200,RplTraceConnecting  = 201,RplTraceHandshake   = 202,RplTraceUnknown     = 203,RplTraceOperator    = 204,RplTraceUser        = 205,RplTraceServer      = 206,RplTraceService     = 207,RplTraceNewType     = 208,RplTraceClass       = 209,RplTraceReconnect   = 210,RplTraceLog         = 261,RplTraceEnd         = 262,// stats
        RplStatsLinkInfo    = 211,// <connection> <sendq> <sentmsg> <sentbyte> <recdmsg> <recdbyte> :<open>
        RplStatsCommands    = 212,// <command> <uses> <bytes>
        RplStatsCLine       = 213,// C <address> * <server> <port> <class>
        RplStatsNLine       = 214,// N <address> * <server> <port> <class>
        RplStatsILine       = 215,// I <ipmask> * <hostmask> <port> <class>
        RplStatsKLine       = 216,// k <address> * <username> <details>
        RplStatsPLine       = 217,// P <port> <??> <??>
        RplStatsqline       = 222,// <mask> :<comment>
        RplStatsELine       = 223,// E <hostmask> * <username> <??> <??>
        RplStatsDLine       = 224,// D <ipmask> * <username> <??> <??>
        RplStatsLLine       = 241,// L <address> * <server> <??> <??>
        RplStatsuLine       = 242,// :Server Up <num> days,<time>
        RplStatsoLine       = 243,// o <mask> <password> <user> <??> <class>
        RplStatsHLine       = 244,// H <address> * <server> <??> <??>
        RplStatsGLine       = 247,// G <address> <timestamp> :<reason>
        RplStatsULine       = 248,// U <host> * <??> <??> <??>
        RplStatsZLine       = 249,// :info
        RplStatsYLine       = 218,// Y <class> <ping> <freq> <maxconnect> <sendq>
        RplEndOfStats       = 219,// <char> :End of /STATS report
        RplStatsUptime      = 242,// GLINE
        RplGLineList        = 280,// <address> <timestamp> <reason>                                                   UNDERNET
        RplEndOfGLineList   = 281,// :End of G-line List                                                              UNDERNET

        // Silence
        RplSilenceList      = 271,// <nick> <mask>                                                                    UNDERNET/DALNET
        RplEndOfSilenceList = 272,// <nick> :End of Silence List                                                      UNDERNET/DALNET

        // LUser
        RplLUserClient      = 251,// :There are <user> users and <invis> invisible on <serv> servers
        RplLUserOp          = 252,// <num> :operator(s) online
        RplLUserUnknown     = 253,// <num> :unknown connection(s)
        RplLUserChannels    = 254,// <num> :channels formed
        RplLUserMe          = 255,// :I have <user> clients and <serv> servers
        RplLUserLocalUser   = 265,// :Current local users: <curr> Max: <max>
        RplLUserGlobalUser  = 266,// :Current global users: <curr> Max: <max>


        // Errors
        ErrNoSuchNick       = 401,// <nickname> :No such nick
        ErrNoSuchServer     = 402,// <server> :No such server
        ErrNoSuchChannel    = 403,// <channel> :No such channel
        ErrCannotSendtochan = 404,// <channel> :Cannot send to channel
        ErrTooManyChannels  = 405,// <channel> :You have joined too many channels
        ErrWasNoSuchNick    = 406,// <nickname> :There was no such nickname
        ErrTooManyTargets   = 407,// <target> :Duplicate recipients. No message delivered
        ErrNoColors         = 408,// <nickname> #<channel> :You cannot use colors on this channel. Not sent: <text>   DALNET
        ErrNoOrigin         = 409,// :No origin specified
        ErrNoRecipient      = 411,// :No recipient given (<command>)
        ErrNoTextToSend     = 412,// :No text to send
        ErrNoTopLevel       = 413,// <mask> :No toplevel domain specified
        ErrWildTopLevel     = 414,// <mask> :Wildcard in toplevel Domain
        ErrBadMask          = 415,ErrTooMuchInfo      = 416,// <command> :Too many lines in the output,restrict your query                     UNDERNET
        ErrUnknownCommand   = 421,// <command> :Unknown command
        ErrNoMotd           = 422,// :MOTD File is missing
        ErrNoAdminInfo      = 423,// <server> :No administrative info available
        ErrFileError        = 424,ErrNoNicknameGiven  = 431,// :No nickname given
        ErrErroneusNickname = 432,// <nickname> :Erroneus Nickname
        ErrNickNameInUse    = 433,// <nickname> :Nickname is already in use.
        ErrNickCollision    = 436,// <nickname> :Nickname collision KILL
        ErrUnAvailResource  = 437,// <channel> :Cannot change nickname while banned on channel
        ErrNickTooFast      = 438,// <nick> :Nick change too fast. Please wait <sec> seconds.                         (most)
        ErrTargetTooFast    = 439,// <target> :Target change too fast. Please wait <sec> seconds.                     DALNET/UNDERNET
        ErrUserNotInChannel = 441,// <nickname> <channel> :They aren't on that channel
        ErrNotOnChannel     = 442,// <channel> :You're not on that channel
        ErrUserOnChannel    = 443,// <nickname> <channel> :is already on channel
        ErrNoLogin          = 444,ErrSummonDisabled   = 445,// :SUMMON has been disabled
        ErrUsersDisabled    = 446,// :USERS has been disabled
        ErrNotRegistered    = 451,// <command> :Register first.
        ErrNeedMoreParams   = 461,// <command> :Not enough parameters
        ErrAlreadyRegistered= 462,// :You may not reregister
        ErrNoPermForHost    = 463,ErrPasswdMistmatch  = 464,ErrYoureBannedCreep = 465,ErrYouWillBeBanned  = 466,ErrKeySet           = 467,// <channel> :Channel key already set
        ErrServerCanChange  = 468,// <channel> :Only servers can change that mode                                     DALNET
        ErrChannelIsFull    = 471,// <channel> :Cannot join channel (+l)
        ErrUnknownMode      = 472,// <char> :is unknown mode char to me
        ErrInviteOnlyChan   = 473,// <channel> :Cannot join channel (+i)
        ErrBannedFromChan   = 474,// <channel> :Cannot join channel (+b)
        ErrBadChannelKey    = 475,// <channel> :Cannot join channel (+k)
        ErrBadChanMask      = 476,ErrNickNotRegistered= 477,// <channel> :You need a registered nick to join that channel.                      DALNET
        ErrBanListFull      = 478,// <channel> <ban> :Channel ban/ignore list is full
        ErrNoPrivileges     = 481,// :Permission Denied- You're not an IRC operator
        ErrChanOPrivsNeeded = 482,// <channel> :You're not channel operator
        ErrCantKillServer   = 483,// :You cant kill a server!
        ErrRestricted       = 484,// <nick> <channel> :Cannot kill,kick or deop channel service                      UNDERNET
        ErrUniqOPrivsNeeded = 485,// <channel> :Cannot join channel (reason)
        ErrNoOperHost       = 491,// :No O-lines for your host
        ErrUModeUnknownFlag = 501,// :Unknown MODE flag
        ErrUsersDontMatch   = 502,// :Cant change mode for other users
        ErrSilenceListFull  = 511                   // <mask> :Your silence list is full                                                UNDERNET/DALNET

    };  // eo enum Reply