写入文本日志

public static void WriteTextLog()
        {
            string sMsg = "";
            try
            {
                FileInfo fi = new FileInfo("MyLog.txt");
                if (!fi.Exists)
                {
                    sMsg = "创建";
                    using (StreamWriter sw = fi.CreateText())
                    {
                        sw.WriteLine(DateTime.Now + "\n" + sMsg + "\n");
                        sw.Close();
                    }
                }
                else
                {
                    sMsg = "修改";
                    using (StreamWriter sw = fi.AppendText())
                    {
                        sw.WriteLine(DateTime.Now + "\n" + sMsg + "\n");
                        sw.Close();
                    }
                }
            }
            catch
            {
            }

        }