asp.net日志

                    string path = "...\\Debug\\log.txt";
                    if (!File.Exists(path))
                    {
                        StreamWriter sw1;
                        sw1 = File.CreateText(path);
                        sw1.Close();
                    }
                    string str = System.DateTime.Now.Year.ToString() + "年" + System.DateTime.Now.Month.ToString() + "月" + System.DateTime.Now.Day.ToString() + "日 " + System.DateTime.Now.Hour.ToString() + ":" + System.DateTime.Now.Minute.ToString() + ":" + System.DateTime.Now.Second.ToString() + "  " + "数据Web服务无法访问或者网络不通. ";
                    StreamWriter sw = File.AppendText(path);
                    sw.WriteLine(str);
                    sw.Close();
                    return;