简单写入本地日志，日志文件位置与主程序exe位置相同

  /// <summary>
        /// 写入本地日志
        /// </summary>
        /// <param name="strText">日志内容</param>
        /// <param name="logPath">日志路径</param>
        /// <param name="fileName">日志文件名称</param>
        public static void SaveLogInfo(string strText, string logPath, string fileName)
        {
            try
            {
                string dtStr = DateTime.Now.ToString("yyyyMMddHHmmssffff");
                if (logPath == null || logPath.Trim() == string.Empty)
                {
                    logPath =  System.Environment.GetFolderPath(Environment.SpecialFolder.Startup);
                }
                if (Directory.Exists(logPath) == false)
                {
                    Directory.CreateDirectory(logPath);
                }

                string strFilePath = "";
                if (string.IsNullOrWhiteSpace(fileName))
                {
                    strFilePath = $"{logPath}\\Log{dtStr}.txt";
                }
                else
                {
                    strFilePath = $"{logPath}\\{fileName}_{dtStr}.txt";
                }
                System.IO.StreamWriter sw = new System.IO.StreamWriter(strFilePath, true, System.Text.Encoding.Default);
                sw.WriteLine($"【{DateTime.Now}】{strText}");
                sw.Close();
            }
            catch (Exception ex)
            {
            }
        }