public static async void AppendOutput(string fileName, DateTime createTime, string content) { string outputsFile = Path.Combine(outputsPath, fileName); await Task.Run(() => { lock (_locker) { string value = string.Format("[{0}]{1}", createTime.ToString("yyyy-MM-dd hh:mm:ss"), content); DirFileHelper.AppendText(outputsFile, value); } }); }