【开源】利用.NET开发第一个ChatGPT聊天系统

最近ChatGPT很火，借此机会给大家推荐一个利用C开发的开源的ChatGPT聊天系统，话不多说，直接上主题。

准备第一步：注册OpenAI账号

因为对大陆以及中国香港地区不开放，所以我们需要小小的科学一下。来一个我就是参照着申请账号的园子的文章:https://www.cnblogs.com/chatgpt/p/how-to-register-chatgpt-in-china.html当然手机那里可以淘宝找，几块钱就能帮忙注册手机，账号里面默认还有18美元余额。

注意点：如果搭建了科学还是提示不对你的国家提供服务的话，尝试清空浏览器缓存或者打开浏览器的无痕窗口。Chrome默认在右上角三个点打开就能找到打开新的无痕式窗口。

万事具备，直接撸代码1.网页获取所需token和cookie

我们需要三个东西：UserAgent，CfClearance，Session_token我们需要先打开ChatGPT官方网站：https://chat.openai.com/chat 然后按下F12打开浏览器的开发者模式UserAgent在网络里（只需要复制UserAgent：后面的值）：

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CfClearance和Session_token在应用程序cookie里面

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2.创建一个session用来表示一个会话public OpenAISession(stringsession_token,string cfClearance,string userAgent)Session_token = session_token;CfClearance = cfClearance;UserAgent = userAgent;headers = new Dictionarystring>();cookies = new Dictionary();Proxies = new Dictionary();

Session可以刷新自己的AccessToken和Session_token

public async Task RefreshSessionAsync()if (string.IsNullOrEmpty(Session_token))throw new exception("No tokens provided");// SetcookiesCookies.Put("__Secure-next-auth.session-token", Session_token);Cookies.Put("cf_clearance", CfClearance);string cookiesString = GetCookiesString();Dictionary map = new Dictionary();Headers.Put("User-Agent", UserAgent);Headers.Put("cookie", cookiesString);Headers.Put("Cookie", cookiesString);var response = await GetAsync("https://chat.openai.com/api/auth/session");if (!response.IsSuccessStatusCode)Console.WriteLine("err code: " + response.StatusCode);Console.WriteLine("cf_clearance: " + CfClearance);Console.WriteLine("token: " + Session_token);Console.WriteLine("userAgent: " + UserAgent);Console.WriteLine("请检查以上参数是否正确，是否过期。");throw new Exception("无法获取token!请重试");trystring name = "__Secure-next-auth.session-token=";var cookies = response.Headers.GetValues("Set-Cookie");var stoken = cookies.FirstOrDefault(x => x.StartsWith(name));Session_token = stoken == null ? Session_token : stoken.Substring(name.Length, stoken.IndexOf(";") - name.Length);Cookies.Put("__Secure-next-auth.session-token", Session_token);var result = await response.Content.ReadAsStringAsync();AccessToken = JsonSerializer.Deserialize(result, _JsonSerializerOptions)?.AccessToken;RefreshHeaders();catch (Exception ex)Console.WriteLine($"Error {nameof(RefreshSessionAsync)}:{ex}");throw new Exception($"Error {nameof(RefreshSessionAsync)}", ex);

获取到的最新的AccessToken更新到header里，Session_token更新到cookie里

private void RefreshHeaders()Headers.Put("Host", "chat.openai.com");Headers.Put("Accept", "text/event-stream");Headers.Put("Authorization", $"Bearer {AccessToken}");Headers.Put("User-Agent", UserAgent);Headers.Put("X-Openai-Assistant-App-Id", string.Empty);Headers.Put("Connection", "close");Headers.Put("Accept-Language", "en-US,en;q=0.9");Headers.Put("Referer", "https://chat.openai.com/chat");string name = "__Secure-next-auth.session-token=";var cookies = response.Headers.GetValues("Set-Cookie");var stoken = cookies.FirstOrDefault(x => x.StartsWith(name));Session_token = stoken == null ? Session_token : stoken.Substring(name.Length, stoken.IndexOf(";") - name.Length);Cookies.Put("__Secure-next-auth.session-token", Session_token);3.创建机器人绑定一个会话public Chatbot(OpenAISession openAISession)OpenAISession = openAISession;ResetConversation();/// 重置Conversation，开启一个新的会话public void ResetConversation()_conversationId = null;_parentMessageId = Guid.NewGuid().ToString();

如何保持上下文聊天以及多用户隔离？上下文聊天已经内置，会自动与机器人的回复进行关联，当需要重新开启一个对话的时候，可以调用ResetConversation，这样对应的机器人对象发过去就是开启了一个新的对话。

如何多用户隔离？比如联合微信机器人使用，可以将一个人或者一个群对应一个Chatbot对象，并且利用id与机器人做关联。当然这个_clientID需要使用者做唯一性管理

//可以作为隔离不同客户端聊天上下文的凭据，即一个机器人绑定一个客户端//客户端编号可以是，微信id,qq id,飞书id,亦或者自己开发的软件的用户idprivate readonly string _clientID;public Chatbot(OpenAISession openAISession, string clientID)OpenAISession = openAISession;_clientID = clientID == null ? Guid.NewGuid().ToString() : clientID;ResetConversation();

最后构造对话对象，发送到对应api

public async Task GetChatReplyAsync(string prompt)var conversation = new Conversation();conversation.Conversation_id = _conversationId;conversation.Parent_message_id = _parentMessageId;conversation.Messages = new Message[]new Message()Content = new ContentParts = new string []{ prompt }return await GetChatResponseAsync(conversation);/// 获取响应/// 服务器返回非200private async Task GetChatResponseAsync(Conversation conversation)using (var client = new HttpClient())var response = await OpenAISession.PostAsync(_conversation, JsonSerializer.Serialize(conversation, _jsonSerializerOptions));if (!response.IsSuccessStatusCode)throw new Exception($"Faild to request.StatusCode:{response.StatusCode}");var msg = await response.Content.ReadAsStringAsync();var data = msg.Split("\n")?.ToList().Where(x => !string.IsNullOrEmpty(x) && !x.Contains("data: [DONE]")).LastOrDefault()?.Substring(5);var reply = JsonSerializer.Deserialize(data, _jsonSerializerOptions);_conversationId = reply.Conversation_id;return reply;效果截图（仅测试）OpenAISession openAIOptions = new OpenAISession(Session_token, CfClearance, UserAgent);await openAIOptions.RefreshSessionAsync();Chatbot chatbot = new Chatbot(openAIOptions);Console.WriteLine("用c++写个冒泡查询");var reply = awaitchatbot.GetChatReplyAsync("用c++写个冒泡查询");Console.WriteLine(reply.Message.Content.Parts.FirstOrDefault());

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