Гайд VK API отправка и получение сообщений

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1. Создаем в проекте API класс, код класса ниже в спойлере
2. Создаем в форме сам API как в втором спойлере и указываем токен группы и id группы
C#: 
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;

namespace BotCore
{
    public class Vk
    {
        public class VkLongPoolClient
        {
            /* VK Client*/
            public VkLongPoolClient(string token, string botCommunityId, Action<Update> onMessageReceivedCallback, IWebProxy webProxy = null)
            {
                Token = token;
                BotCommunityId = botCommunityId;
                OnMessageReceivedCallback = onMessageReceivedCallback;
                ReceiverWebClient = new WebClient() { Proxy = webProxy, Encoding = Encoding.UTF8 };
                SenderWebClient = new WebClient() { Proxy = webProxy, Encoding = Encoding.UTF8 };

                Messages = new _Messages_(this);

                Init();
                StartLongPoolAsync();
            }
            private static WebClient ReceiverWebClient { get; set; }
            private static WebClient SenderWebClient { get; set; }
            private static string Token { get; set; }
            private int LastTs { get; set; }
            private string Server { get; set; }
            private string Key { get; set; }
            private Action<Update> OnMessageReceivedCallback { get; set; }
            private static string BotCommunityId { get; set; }
            private static Random rnd = new Random();
            /* Methods */

            public _Utils_ Utils = new _Utils_();
            public _Docs_ Docs = new _Docs_();
            public _Messages_ Messages;
            public _Groups_ Groups = new _Groups_();
            public class _Utils_
            {
                /* Utils */
                public string GetShortLink(string url)
                {
                    if (Uri.IsWellFormedUriString(url, UriKind.Absolute))
                    {
                        string json = CallVkMethod("utils.getShortLink", "url=" + url);
                        var j = JsonConvert.DeserializeObject(json) as JObject;
                        var link = j["response"]["short_url"].ToString();
                        return link;
                    }
                    else
                    {
                        return "Invalid link format";
                    }
                }
            }
            public class _Docs_
            {
                /* Docs */
                public string GetMessagesUploadServer(string peer_id, string type, string file)
                {
                    string string1 = CallVkMethod("docs.getMessagesUploadServer", "peer_id=" + peer_id + "&type=" + type);
                    if (string1 != "")
                    {
                        string uploadurl = Regex.Match(string1, "\"upload_url\":\"(.*)\"").Groups[1].Value.Replace(@"\/", "/");
                        return uploadurl;
                    }
                    else
                    {
                        return "";
                    }
                }
                public string GetMessagesUploadServer(int? peer_id, string type, string file)
                {
                    return GetMessagesUploadServer(peer_id.ToString(), type, file);
                }
                public string Upload(string url, string file)
                {
                    var c = new WebClient();
                    var r2 = Encoding.UTF8.GetString(c.UploadFile(url, "POST", file));
                    if (r2 != "")
                    {
                        return r2;
                    }
                    else
                    {
                        return Upload(url, file);
                    }
                }
                public string Save(string file, string title)
                {
                    var j2 = JsonConvert.DeserializeObject(file) as JObject;
                    string json = CallVkMethod("docs.save", "&file=" + j2["file"].ToString() + "&title=" + title);
                    if (json != "")
                    {
                        return json;
                    }
                    else
                    {
                        return Save(file, title);
                    }
                }
                public string Get_Send_Attachment(string file)
                {
                    var j3 = JsonConvert.DeserializeObject(file) as JObject;
                    var at = "doc" + j3["response"]["doc"]["owner_id"].ToString() + "_" + j3["response"]["doc"]["id"].ToString();
                    return at;
                }
            }
            public class _Messages_
            {
                VkLongPoolClient vk;
                public _Messages_(VkLongPoolClient vk)
                {
                    this.vk = vk;

                    Send = new _Send_(vk);
                    Kick = new _Kick_();
                    Get = new _Get_();
                }
                public _Send_ Send;
                public _Kick_ Kick;
                public _Get_ Get;
                public class _Get_
                {
                    public string InviteLink(string chatId, bool reset)
                    {
                        try
                        {
                            string json = CallVkMethod("messages.getInviteLink", "peer_id=" + chatId + "&group_id=" + BotCommunityId);
                            if (json != "")
                            {
                                var j = JsonConvert.DeserializeObject(json) as JObject;
                                var link = j["response"]["link"].ToString();
                                if (link != "")
                                {
                                    return link;
                                }
                                else
                                {
                                    return "";
                                }
                            }
                            else
                            {
                                return "";
                            }
                        }
                        catch { return ""; }
                    }
                    public string InviteLink(int? chatId, bool reset)
                    {
                        return InviteLink(chatId.ToString(), reset);
                    }
                }
                public class _Send_
                {
                    VkLongPoolClient vk;
                    public _Send_(VkLongPoolClient vk)
                    {
                        this.vk = vk;
                    }
                    /* Messages Send */
                    public void Text(string chatId, string text, int mentos = 1)
                    {
                        string reply = CallVkMethod("messages.send", "peer_id=" + chatId + "&random_id=" + rnd.Next() + "&message=" + text + "&disable_mentions=" + mentos);
                    }
                    public void Text(int? chatId, string text, int mentos = 1)
                    {
                        Text(chatId.ToString(), text, mentos);
                    }

                    public void Keyboard(string chatId, Keyboard keyboard)
                    {
                        string kb = keyboard.GetKeyboard();
                        string reply = CallVkMethod("messages.send", "peer_id=" + chatId + "&random_id=" + rnd.Next() + "&keyboard=" + kb);
                    }
                    public void Keyboard(int? chatId, Keyboard keyboard)
                    {
                        Keyboard(chatId.ToString(), keyboard);
                    }

                    public void TextAndKeyboard(string chatId, string text, Keyboard keyboard)
                    {
                        if (keyboard.buttons.Count() > 0)
                        {
                            string kb = keyboard.GetKeyboard();
                            string reply = CallVkMethod("messages.send", "peer_id=" + chatId + "&random_id=" + rnd.Next() + "&message=" + text + "&keyboard=" + kb);
                        }
                        else
                        {
                            Text(chatId, text);
                        }
                    }
                    public void TextAndKeyboard(int? chatId, string text, Keyboard keyboard)
                    {
                        TextAndKeyboard(chatId.ToString(), text, keyboard);
                    }

                    public void Sticker(string chatId, int sticker_id)
                    {
                        string reply = CallVkMethod("messages.send", "peer_id=" + chatId + "&random_id=" + rnd.Next() + "&sticker_id=" + sticker_id);
                    }
                    public void Sticker(int? chatId, int? sticker_id)
                    {
                        Sticker(chatId.ToString(), (int)sticker_id);
                    }

                    public void TextAndDocument(string chatId, string text, string file, string title)
                    {
                        string u2 = vk.Docs.GetMessagesUploadServer(chatId, "doc", file);
                        string r2 = vk.Docs.Upload(u2, file);
                        string r3 = vk.Docs.Save(r2, title);
                        string at = vk.Docs.Get_Send_Attachment(r3);
                        string reply = CallVkMethod("messages.send", "peer_id=" + chatId + "&random_id=" + rnd.Next() + "&message=" + text + "&attachment=" + at);
                    }
                    public void TextAndDocument(int? chatId, string text, string file, string title)
                    {
                        TextAndDocument(chatId.ToString(), text, file, title);
                    }

                    public void Custom(string chatId, string custom)
                    {
                        string reply = CallVkMethod("messages.send", "peer_id=" + chatId + "&random_id=" + rnd.Next() + custom);
                    }
                    public void Custom(int? chatId, string custom)
                    {
                        Custom(chatId.ToString(), custom);
                    }
                }
                public class _Kick_
                {
                    public void Group(string chat_id, string user_id)
                    {
                        if (user_id != BotCommunityId)
                        {
                            string json = CallVkMethod("messages.removeChatUser", "chat_id=" + chat_id + "&member_id=" + "-" + user_id);
                        }
                    }
                    public void Group(int? chat_id, int user_id)
                    {
                        Group(chat_id.ToString(), user_id.ToString());
                    }

                    public void User(string chat_id, string user_id)
                    {
                        string json = CallVkMethod("messages.removeChatUser", "chat_id=" + chat_id + "&user_id=" + user_id + "&member_id=" + user_id);
                    }
                    public void User(int? chat_id, int? user_id)
                    {
                        User(chat_id.ToString(), user_id.ToString());
                    }
                }
                public void SetActivity(string chatId, string type = "typing")
                {
                    string id3 = chatId;
                    id3 = id3.Substring(1);
                    int ind = Convert.ToInt32(id3);
                    CallVkMethod("messages.setActivity", "user_id=" + BotCommunityId + "&peer_id=" + chatId + "&group_id=" + "&type=" + type + "&group_id=" + BotCommunityId);
                    CallVkMethod("messages.setActivity", "user_id=" + BotCommunityId + "&peer_id=" + ind + "&type=" + type + "&group_id=" + BotCommunityId);
                }
                public void SetActivity(int? chatId, string type = "typing")
                {
                    SetActivity(chatId.ToString(), type);
                }

            }
            public class _Groups_
            {
                /* Groups */
                public void Online(bool enable = true)
                {
                    if (enable)
                    {
                        CallVkMethod("groups.enableOnline", "group_id=" + BotCommunityId);
                    }
                    else
                    {
                        CallVkMethod("groups.disableOnline", "group_id=" + BotCommunityId);
                    }
                }

                public string GetName_ByID(int? group_id)
                {
                    try
                    {
                        string js = CallVkMethod("groups.getById", "group_id=" + group_id);
                        if (js != "")
                        {
                            var j3 = JsonConvert.DeserializeObject(js) as JObject;
                            string name = j3["response"][0]["name"].ToString();
                            return name;
                        }
                        else
                        {
                            return "";
                        }
                    }
                    catch { return ""; }
                }
                public string GetName_ByID(string group_id)
                {
                    return GetName_ByID(int.Parse(group_id));
                }
            }
            public class _Users_
            {
                /* Users */
                public string Get_FirstName_ByID(int? user_id)
                {
                    try
                    {
                        string js = CallVkMethod("users.get", "user_ids=" + user_id);
                        if (js != "")
                        {
                            var j3 = JsonConvert.DeserializeObject(js) as JObject;
                            string name = j3["response"][0]["first_name"].ToString();
                            return name;
                        }
                        else
                        {
                            return "";
                        }
                    }
                    catch { return ""; }
                }
                public string Get_FirstName_ByID(string user_id)
                {
                    return Get_FirstName_ByID(int.Parse(user_id));
                }
            }

            public class Keyboard
            {
                public bool one_time = false;
                public List<List<object>> buttons = new List<List<object>>();
                public bool inline = false;
                public Keyboard(bool one_time2, bool line = false)
                {
                    if (line == true && one_time2 == true)
                        one_time2 = false;

                    one_time = one_time2;
                    inline = line;
                }

                public void AddButton(string label, string payload, string color)
                {
                    Buttons button = new Buttons(label, payload, color);
                    buttons.Add(new List<object>() { button });
                }
                public string GetKeyboard()
                {
                    return JsonConvert.SerializeObject(this, Formatting.Indented); ;
                }
                public class Buttons
                {
                    public Action action;
                    public string color;
                    public Buttons(string labe11, string payload1, string color2)
                    {
                        action = new Action(labe11, payload1);
                        color = color2;
                    }

                    public class Action
                    {
                        public string type;
                        public string payload;
                        public string label;
                        public Action(string label3, string payload3)
                        {
                            type = "text";
                            payload = "{\"button\": \"" + payload3 + "\"}";
                            label = label3;
                        }
                    }
                }
            }

            /* LoongPool */
            private void Init()
            {
                var jsonResult = CallVkMethod("groups.getLongPollServer", "group_id=" + BotCommunityId);
                var j = JsonConvert.DeserializeObject(jsonResult) as JObject;

                Key = j["response"]["key"].ToString();
                Server = j["response"]["server"].ToString();
                LastTs = Convert.ToInt32(j["response"]["ts"].ToString());
            }
            private void StartLongPoolAsync()
            {
                Task.Factory.StartNew(() =>
                {
                    while (true)
                    {
                        try
                        {
                            string baseUrl = String.Format("{0}?act=a_check&version=2&wait=25&key={1}&ts=", Server, Key);
                            var data = ReceiverWebClient.DownloadString(baseUrl + LastTs);
                            var messages = ProcessResponse(data);
                            foreach (Update update in messages)
                            {
                                OnMessageReceivedCallback(update);
                            }
                        }
                        catch { }
                    }
                });
            }
            /* LongPool Data */
            public class AudioMsg
            {
                public int duration { get; set; }
                public string link_mp3 { get; set; }
                public string link_ogg { get; set; }
                public List<int> waveform { get; set; }
            }

            public class Preview
            {
                public AudioMsg audio_msg { get; set; }
            }
            public class Image
            {
                public string url { get; set; }
                public int width { get; set; }
                public int height { get; set; }
            }

            public class FwdMessage
            {
                public int date { get; set; }
                public int from_id { get; set; }
                public string text { get; set; }
                public List<object> attachments { get; set; }
            }
            public class ImagesWithBackground
            {
                public string url { get; set; }
                public int width { get; set; }
                public int height { get; set; }
            }

            public class Sticker
            {
                public int product_id { get; set; }
                public int sticker_id { get; set; }
                public List<Image> images { get; set; }
                public List<ImagesWithBackground> images_with_background { get; set; }
            }
            public class Doc
            {
                public int id { get; set; }
                public int owner_id { get; set; }
                public string title { get; set; }
                public int size { get; set; }
                public string ext { get; set; }
                public int date { get; set; }
                public int type { get; set; }
                public string url { get; set; }
                public Preview preview { get; set; }
                public string access_key { get; set; }
            }
            public class Audio
            {
                public string artist { get; set; }
                public int id { get; set; }
                public int owner_id { get; set; }
                public string title { get; set; }
                public int duration { get; set; }
                public string url { get; set; }
                public int date { get; set; }
                public bool is_hq { get; set; }
                public bool short_videos_allowed { get; set; }
                public bool stories_allowed { get; set; }
                public bool stories_cover_allowed { get; set; }
            }
            public class Size
            {
                public int height { get; set; }
                public string url { get; set; }
                public string type { get; set; }
                public int width { get; set; }
            }

            public class Photo
            {
                public int album_id { get; set; }
                public int date { get; set; }
                public int id { get; set; }
                public int owner_id { get; set; }
                public bool has_tags { get; set; }
                public int post_id { get; set; }
                public List<Size> sizes { get; set; }
                public string text { get; set; }
            }
            public class Attachment
            {
                public string type { get; set; }
                public Sticker sticker { get; set; }
                public Doc doc { get; set; }
                public Audio audio { get; set; }
                public Photo photo { get; set; }
            }
            public class Object
            {
                public string state { get; set; }
                public int from_id { get; set; }
                public int to_id { get; set; }
                public int? date { get; set; }
                public int? id { get; set; }
                public int? @out { get; set; }
                public int? peer_id { get; set; }
                public string text { get; set; }
                public int? conversation_message_id { get; set; }
                public Action action { get; set; }
                public List<FwdMessage> fwd_messages { get; set; }
                public bool? important { get; set; }
                public int? random_id { get; set; }
                public List<Attachment> attachments { get; set; }
                public string payload { get; set; }
                public bool? is_hidden { get; set; }
            }
            public class Action
            {
                /* Types
                1. chat_invite_user
                2. chat_kick_user

                */
                public string type { get; set; }
                public int member_id { get; set; }
            }

            public class Update
            {
                public string type { get; set; }
                public Object @object { get; set; }
                public int group_id { get; set; }
                public string event_id { get; set; }
            }

            public class Root
            {
                public int? failed { get; set; }
                public string ts { get; set; }
                public List<Update> updates { get; set; }
            }


            private List<Update> ProcessResponse(string jsonData)
            {
                if (jsonData == "{\"failed\":1}" || jsonData == "{\"failed\":2}" || jsonData == "{\"failed\":3}")
                {
                    Init();
                }
                Root myDeserializedClass = JsonConvert.DeserializeObject<Root>(jsonData);
                if (myDeserializedClass == null || myDeserializedClass.failed != null)
                {
                    Init();
                }
                LastTs = Convert.ToInt32(myDeserializedClass.ts);
                return myDeserializedClass.updates;
            }

            public static string CallVkMethod(string methodName, string data)
            {
                try
                {
                    var url = String.Format("https://api.vk.com/method/{0}?v=5.122&access_token={1}&{2}", methodName, Token, data);
                    var jsonResult = SenderWebClient.DownloadString(url);

                    return jsonResult;
                }
                catch { return String.Empty; }
            }
        }
    }
}
C#: 
public static Vk.VkLongPoolClient vkclient;
public static void Main(string[] args)
{
    vkclient = new Vk.VkLongPoolClient("token", "vkid", MSG);
}
public static void MSG(Vk.VkLongPoolClient.Update update)
{
    if (update.@object.text == "1")
    {
        vkclient.Messages.Send.Text(update.@object.peer_id, "Сообщение обработано сервером");
    }
}
 
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