# 使用Package Manager Console
Install-Package Newtonsoft.Json
Install-Package RestSharp

{
  "DingTalk": {
    "AppKey": "your_app_key",
    "AppSecret": "your_app_secret",
    "AgentId": 123456789,
    "Webhook": "your_webhook_url",
    "Secret": "your_robot_secret"
  }
}

using Newtonsoft.Json;
using RestSharp;
using System;
using System.Configuration;
using System.Threading.Tasks;
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public class DingTalkTokenManager
{
    private static string _accessToken = string.Empty;
    private static DateTime _tokenExpireTime = DateTime.MinValue;
    private readonly string _appKey;
    private readonly string _appSecret;
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    public DingTalkTokenManager(string appKey, string appSecret)
    {
        _appKey = appKey;
        _appSecret = appSecret;
    }
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    public async Task<string> GetAccessTokenAsync()
    {
        // 檢查令牌是否已過期，如未過期則直接返回
        if (!string.IsNullOrEmpty(_accessToken) && DateTime.Now < _tokenExpireTime)
        {
            return _accessToken;
        }
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        // 調(diào)用釘釘API獲取新的訪問令牌
        var client = new RestClient("https://oapi.dingtalk.com");
        var request = new RestRequest("gettoken", Method.GET);
        request.AddParameter("appkey", _appKey);
        request.AddParameter("appsecret", _appSecret);
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        var response = await client.ExecuteAsync(request);
        var result = JsonConvert.DeserializeObject<dynamic>(response.Content);
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        if (result.errcode == 0)
        {
            _accessToken = result.access_token;
            // 訪問令牌有效期為7200秒，我們設(shè)置提前10分鐘刷新
            _tokenExpireTime = DateTime.Now.AddSeconds(result.expires_in - 600);
            return _accessToken;
        }
        else
        {
            throw new Exception($"獲取訪問令牌失?。簕result.errmsg}");
        }
    }
}

using Newtonsoft.Json;
using RestSharp;
using System;
using System.Collections.Generic;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;
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public class DingTalkMessageSender
{
    private readonly DingTalkTokenManager _tokenManager;
    private readonly string _agentId;
    private readonly string _webhook;
    private readonly string _secret;
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    public DingTalkMessageSender(string appKey, string appSecret, string agentId, string webhook = "", string secret = "")
    {
        _tokenManager = new DingTalkTokenManager(appKey, appSecret);
        _agentId = agentId;
        _webhook = webhook;
        _secret = secret;
    }
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    /// <summary>
    /// 發(fā)送工作通知消息
    /// </summary>
    public async Task<dynamic> SendWorkNoticeAsync(string userIdList, string deptIdList, string toAllUser, string message)
    {
        var accessToken = await _tokenManager.GetAccessTokenAsync();
        var client = new RestClient("https://oapi.dingtalk.com");
        var request = new RestRequest("topapi/message/corpconversation/asyncsend_v2", Method.POST);
        request.AddParameter("access_token", accessToken);
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        var requestBody = new
        {
            agent_id = _agentId,
            userid_list = userIdList, // 用戶ID列表，多個用戶用逗號分隔
            dept_id_list = deptIdList, // 部門ID列表，多個部門用逗號分隔
            to_all_user = toAllUser, // 是否發(fā)送給全員
            msg = new
            {
                msgtype = "text",
                text = new { content = message }
            }
        };
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        request.AddJsonBody(requestBody);
        var response = await client.ExecuteAsync(request);
        return JsonConvert.DeserializeObject<dynamic>(response.Content);
    }
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    /// <summary>
    /// 通過機器人發(fā)送群消息
    /// </summary>
    public async Task<dynamic> SendRobotMessageAsync(string message)
    {
        if (string.IsNullOrEmpty(_webhook))
        {
            throw new Exception("Webhook地址未配置");
        }
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        var client = new RestClient(_webhook);
        var request = new RestRequest(Method.POST);
        
        // 如果配置了加簽，需要生成簽名
        if (!string.IsNullOrEmpty(_secret))
        {
            var timestamp = DateTimeOffset.Now.ToUnixTimeMilliseconds().ToString();
            var stringToSign = $"{timestamp}\n{_secret}";
            var signature = ComputeHmacSha256(stringToSign);
            request.AddQueryParameter("timestamp", timestamp);
            request.AddQueryParameter("sign", signature);
        }
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        var requestBody = new
        {
            msgtype = "text",
            text = new { content = message }
        };
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        request.AddJsonBody(requestBody);
        var response = await client.ExecuteAsync(request);
        return JsonConvert.DeserializeObject<dynamic>(response.Content);
    }
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    /// <summary>
    /// 計算HMAC-SHA256簽名
    /// </summary>
    private string ComputeHmacSha256(string data)
    {
        var encoding = new UTF8Encoding();
        byte[] keyBytes = encoding.GetBytes(_secret);
        byte[] messageBytes = encoding.GetBytes(data);
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        using (var hmacsha256 = new HMACSHA256(keyBytes))
        {
            byte[] hashmessage = hmacsha256.ComputeHash(messageBytes);
            return Convert.ToBase64String(hashmessage);
        }
    }
}

/// <summary>
/// 發(fā)送文本消息（擴展方法）
/// </summary>
public async Task<dynamic> SendTextMessageAsync(string userIdList, string message)
{
    return await SendWorkNoticeAsync(userIdList, "", "false", message);
}

/// <summary>
/// 發(fā)送Markdown消息
/// </summary>
public async Task<dynamic> SendMarkdownMessageAsync(string userIdList, string title, string markdownText)
{
    var accessToken = await _tokenManager.GetAccessTokenAsync();
    var client = new RestClient("https://oapi.dingtalk.com");
    var request = new RestRequest("topapi/message/corpconversation/asyncsend_v2", Method.POST);
    request.AddParameter("access_token", accessToken);
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    var requestBody = new
    {
        agent_id = _agentId,
        userid_list = userIdList,
        to_all_user = "false",
        msg = new
        {
            msgtype = "markdown",
            markdown = new
            {
                title = title,
                text = markdownText
            }
        }
    };
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    request.AddJsonBody(requestBody);
    var response = await client.ExecuteAsync(request);
    return JsonConvert.DeserializeObject<dynamic>(response.Content);
}

/// <summary>
/// 發(fā)送卡片消息
/// </summary>
public async Task<dynamic> SendActionCardMessageAsync(string userIdList, string title, string markdownText, string singleTitle, string singleURL)
{
    var accessToken = await _tokenManager.GetAccessTokenAsync();
    var client = new RestClient("https://oapi.dingtalk.com");
    var request = new RestRequest("topapi/message/corpconversation/asyncsend_v2", Method.POST);
    request.AddParameter("access_token", accessToken);
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    var requestBody = new
    {
        agent_id = _agentId,
        userid_list = userIdList,
        to_all_user = "false",
        msg = new
        {
            msgtype = "action_card",
            action_card = new
            {
                title = title,
                text = markdownText,
                single_title = singleTitle,
                single_url = singleURL,
                btn_orientation = "0"
            }
        }
    };
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    request.AddJsonBody(requestBody);
    var response = await client.ExecuteAsync(request);
    return JsonConvert.DeserializeObject<dynamic>(response.Content);
}

using Microsoft.Extensions.Configuration;
using System;
using System.IO;
using System.Threading.Tasks;
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class Program
{
    static async Task Main(string[] args)
    {
        // 讀取配置文件
        var configuration = new ConfigurationBuilder()
            .SetBasePath(Directory.GetCurrentDirectory())
            .AddJsonFile("appsettings.json")
            .Build();
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        // 獲取配置信息
        var appKey = configuration["DingTalk:AppKey"];
        var appSecret = configuration["DingTalk:AppSecret"];
        var agentId = configuration["DingTalk:AgentId"];
        var webhook = configuration["DingTalk:Webhook"];
        var secret = configuration["DingTalk:Secret"];
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        try
        {
            // 初始化消息發(fā)送器
            var messageSender = new DingTalkMessageSender(appKey, appSecret, agentId, webhook, secret);
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            // 示例1：發(fā)送工作通知文本消息
            Console.WriteLine("發(fā)送工作通知文本消息...");
            var userIdList = "user1,user2";
            var textResponse = await messageSender.SendTextMessageAsync(userIdList, "這是一條測試消息，由C#程序發(fā)送。");
            Console.WriteLine($"發(fā)送結(jié)果：{JsonConvert.SerializeObject(textResponse)}");
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            // 示例2：發(fā)送Markdown消息
            Console.WriteLine("\n發(fā)送Markdown消息...");
            var markdownTitle = "項目進(jìn)度通知";
            var markdownContent = @"# 項目進(jìn)度通報\n\n> 項目A已完成70%\n> 項目B已完成45%\n\n## 本周重點任務(wù)\n- 完成項目A的模塊三開發(fā)\n- 開始項目B的系統(tǒng)測試\n\n**請相關(guān)負(fù)責(zé)人注意時間節(jié)點！**";
            var markdownResponse = await messageSender.SendMarkdownMessageAsync(userIdList, markdownTitle, markdownContent);
            Console.WriteLine($"發(fā)送結(jié)果：{JsonConvert.SerializeObject(markdownResponse)}");
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            // 示例3：發(fā)送卡片消息
            Console.WriteLine("\n發(fā)送卡片消息...");
            var cardTitle = "重要會議通知";
            var cardContent = @"# 產(chǎn)品評審會議\n\n**時間：** 2023年10月15日 14:00-16:00\n**地點：** 三樓會議室A\n**參會人員：** 產(chǎn)品部全體成員、開發(fā)團(tuán)隊負(fù)責(zé)人\n\n## 會議議程\n1. 產(chǎn)品需求回顧\n2. 功能設(shè)計評審\n3. 開發(fā)進(jìn)度同步\n4. 問題討論與解決";
            var cardResponse = await messageSender.SendActionCardMessageAsync(userIdList, cardTitle, cardContent, "查看詳情", "https://example.com/meeting-details");
            Console.WriteLine($"發(fā)送結(jié)果：{JsonConvert.SerializeObject(cardResponse)}");
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            // 示例4：通過機器人發(fā)送群消息
            Console.WriteLine("\n通過機器人發(fā)送群消息...");
            var robotResponse = await messageSender.SendRobotMessageAsync("【系統(tǒng)通知】服務(wù)器備份任務(wù)已完成，備份文件大?。?.5GB");
            Console.WriteLine($"發(fā)送結(jié)果：{JsonConvert.SerializeObject(robotResponse)}");
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            Console.WriteLine("\n所有消息發(fā)送完成！");
        }
        catch (Exception ex)
        {
            Console.WriteLine($"發(fā)送消息時發(fā)生錯誤：{ex.Message}");
        }
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        Console.ReadLine();
    }
}