C# 寫日志文件

 public static void WriteLog(string txt)

        {

            try

            {

                string path = Application.StartupPath + @"\log\" + DateTime.Now.ToString("yyyy-MM-dd") + @"\";

                if (!Directory.Exists(path))

                {

                    Directory.CreateDirectory(path);

                }

                path +=  DateTime.Now.ToString("yyyyMMdd") + "-" + DateTime.Now.ToString("HH") + ".txt";

                if (!File.Exists(path))

                {

                    File.Create(path);

                }

                FileStream fs;

                StreamWriter sw;

                fs = new FileStream(path, FileMode.Append);

                sw = new StreamWriter(fs, Encoding.Default);

                sw.Write(DateTime.Now.ToString("HH:mm:ss") + " " + txt + "\r\n");

                sw.Close();

                fs.Close();

            }

            catch (Exception ex)

            {

                WriteLog("程序發生異常（WriteLog）。詳情：" + ex.Message);

            }

        }