Slack Integration-如何在发布到频道时使用@通知用户

我有一段代码,它在构建完成后通知一个空闲通道。在某些情况下,每当构建失败时,我希望向自己添加一个通知,以便能够快速扭转问题。我如何更新此内容以包含对使用@符号的人的通知?

我在网上看到的一些示例使用SlackMessage构造函数添加用户名,但由于某些原因,我无法重载此构造函数。

public static void PostToSlack()
        {
            string url= "...";
            string slackUrl = GlobalData.slackUrl;
            string buildName = TestContext.Parameters["BuildName"];
            string buildID = TestContext.Parameters["BuildID"];
            string testName = TestContext.CurrentContext.Test.Name;
            string outcome = TestContext.CurrentContext.Result.Outcome.ToString();

            //If tests failed but the suite actually completed, set more understandable outcome message
            if (outcome == "Failed(Child)")
            {
                outcome = "Completed with Issues";
            }

            //Build the text string to post to slack
            string postText = "Build Completed";

            SlackMessage message = new SlackMessage
            {
                text = postText
            };


            //Convert serializable object to JSON
            string json = JsonConvert.SerializeObject(message, Newtonsoft.Json.Formatting.Indented);

            var httpWebRequest = (HttpWebRequest)WebRequest.Create(slackUrl);
            httpWebRequest.ContentType = "application/json";
            httpWebRequest.Method = "POST";

            //Send to Slack
            using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
            {
                streamWriter.Write(json);
                streamWriter.Flush();
                streamWriter.Close();
            }

            //Error checking if Slack sends back a 404 or 400
            var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
            using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
            {
                var result = streamReader.ReadToEnd();
            }

        }