NLog Slack Target

Bootstrap.cs

public static class Bootstrap 
{
  private static void BootstrapNLog()
  {
      var config = new LoggingConfiguration();

      var slackTarget = new SlackTarget();

      config.AddTarget("slack", slackTarget);
      config.LoggingRules.Add(new LoggingRule("*", LogLevel.Warn, slackTarget));

      LogManager.Configuration = config;
  }
}

RequestHelper.cs

 public static class RequestHelper
    {
        public static string MakeJsonPost(string url, string json)
        {
            var httpClient = new HttpClient();

            httpClient.DefaultRequestHeaders.ExpectContinue = false;
            httpClient.DefaultRequestHeaders.ConnectionClose = true;

            var stringContent = new StringContent(json);
            var response = httpClient.PostAsync(url, stringContent).Result;

            try
            {
                response.EnsureSuccessStatusCode();
            }
            catch (Exception)
            {
                throw;
            }
            return response.Content.ReadAsStringAsync().Result;
        }
    }

SlackPostModel.cs

public class SlackPostModel
    {
        [JsonProperty("text")]
        public string Text { get; set; }
    }

SlackTarget.cs

[Target("Slack")]
    public sealed class SlackTarget : TargetWithLayout
    {
        protected override void Write(LogEventInfo logEvent)
        {
            var logMessage = Layout.Render(logEvent);
            var json = JsonConvert.SerializeObject(new SlackPostModel() {Text = logMessage});

            RequestHelper.MakeJsonPost(ConfigurationManager.AppSettings["Slack.HangfireUrl"], json);
        }
    }