C# 钉钉WebHook机器人

官方连接

https://open.dingtalk.com/document/robots/custom-robot-access
添加Webhook机器人，我选择的安全方式是关键词==“消息”==

        static async Task SendMarkdownMessage(string webhookUrl, string title, string markdownContent)
    {
        using (HttpClient client = new HttpClient())
        {
            var payload = new
            {
                msgtype = "markdown",
                markdown = new
                {
                    title = title,
                    text = markdownContent
                }
            };

            string jsonPayload = Newtonsoft.Json.JsonConvert.SerializeObject(payload);
            var content = new StringContent(jsonPayload, Encoding.UTF8, "application/json");

            var response = await client.PostAsync(webhookUrl, content);

            if (response.IsSuccessStatusCode)
            {
                Console.WriteLine("Markdown message sent successfully!");
            }
            else
            {
                Console.WriteLine("Failed to send Markdown message. Status code: " + response.StatusCode);
            }
        }
    }
    private async void  button1_Click(object sender, EventArgs e)
    {
        string webhookUrl = "https://oapi.dingtalk.com/robot/send?access_token=你自己的的token";
        string markdownContent = "# 消息 Hello, Markdown#![](https://help-static-aliyun-doc.aliyuncs.com/assets/img/zh-CN/4099076061/p131227.png)";
        string title = "消息 Markdown Message";

        await SendMarkdownMessage(webhookUrl, title, markdownContent);
    }
}

但是这样有缺陷，不能发送本地文件

使用关键词有一个累赘词，还是比较讨厌的，虽然方式简单，下面使用加签的方式

   static async Task SendMarkdownMessage(string webhookUrl, string accessToken, string secret, string title, string markdownContent)
    {
        long timestamp = DateTimeOffset.Now.ToUnixTimeMilliseconds();
        string sign = ComputeSignature(secret, timestamp);

        string url = $"{webhookUrl}?access_token={accessToken}&timestamp={timestamp}&sign={sign}";

        using (HttpClient client = new HttpClient())
        {
            var payload = new
            {
                msgtype = "markdown",
                markdown = new
                {
                    title = title,
                    text = markdownContent
                }
            };

            string jsonPayload = Newtonsoft.Json.JsonConvert.SerializeObject(payload);
            var content = new StringContent(jsonPayload, Encoding.UTF8, "application/json");

            var response = await client.PostAsync(url, content);

            if (response.IsSuccessStatusCode)
            {
                Console.WriteLine("Markdown message sent successfully!");
            }
            else
            {
                Console.WriteLine("Failed to send Markdown message. Status code: " + response.StatusCode);
            }
        }
    }

    static string ComputeSignature(string secret, long timestamp)
    {
        string stringToSign = $"{timestamp}\n{secret}";
        byte[] secretBytes = Encoding.UTF8.GetBytes(secret);
        byte[] stringToSignBytes = Encoding.UTF8.GetBytes(stringToSign);

        using (var hmac = new HMACSHA256(secretBytes))
        {
            byte[] hashBytes = hmac.ComputeHash(stringToSignBytes);
            return Convert.ToBase64String(hashBytes);
        }
    }
    private void Form1_Load(object sender, EventArgs e)
        {
            
        }

        private async void button1_Click(object sender, EventArgs e)
        {
            string webhookUrl = "https://oapi.dingtalk.com/robot/send";
            string accessToken = "自己的token";
            string secret = "设置加签后的密钥";

            string markdownContent = "# 使用加签无拘无束!![pic](https://p5.ssl.qhimgs1.com/sdr/400__/t01052dd2d43d8ee815.png)";
            string title = "Markdown Message";

            await SendMarkdownMessage(webhookUrl, accessToken, secret, title, markdownContent);
        }
    }
}