给系统添加日志（封装成了日志类，其它应用可以直接调用）
给系统添加日志后，在系统出错时，可以通过日志查看请求的接口，向接口发送的数据，以及接口数返回的数据，请求时花费的时间，方便排查问题。
1.日志类
WMSLog.cs
/// <summary> /// 日志类 /// </summary> public class WMSLog { //日志文件所在路径 private static string _logPath = ""; /// <summary> /// 保存日志的文件夹 /// </summary> public static string LogPath { get { if (_logPath == string.Empty) { if (!Directory.Exists(AppDomain.CurrentDomain.BaseDirectory + @"WMSLog\")) { Directory.CreateDirectory(AppDomain.CurrentDomain.BaseDirectory + @"WMSLog\"); } _logPath = AppDomain.CurrentDomain.BaseDirectory + @"WMSLog\"; } return _logPath; } } //日志前缀说明信息 private static string LogFielPrefix = "WMS"; private static string FilePath = string.Empty;//未加密的文件路径 private static string EFilePath = string.Empty;//加密后的文件路径 /// <summary> /// 写日志 /// <param name="logType">日志类型</param> /// <param name="msg">日志内容</param> /// </summary> private static void WriteLog(string logType, string msg) { //先检测日志文件是否存在，不存在则创建 CheckFileExist(); string filename = string.Format("{0}_{1}.Log", LogFielPrefix, DateTime.Now.ToString("yyyy-MM-dd")); FilePath = string.Format("{0}{1}", LogPath, filename); EFilePath = string.Format("{0}/Encrypt{1}", LogPath, filename); //开始写入日志 StreamWriter sw = null;//未加密的 StreamWriter esw = null;//加密的 string tempMsg = string.Format("{0}#{1}:{2}", logType, DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss:fff"), msg); #region 未加密的日志写入 try { //同一天同一类日志以追加形式保存 sw = File.AppendText(FilePath); //写入日志 sw.WriteLine(tempMsg); } catch (Exception ex) { Console.WriteLine(ex); } finally { if (sw != null) sw.Close(); } #endregion #region 加密的日志写入 try { //同一天同一类日志以追加形式保存 esw = File.AppendText(EFilePath); //对字符串进行加密 string enMsg = EncryptString(tempMsg); //写入日志 esw.WriteLine(enMsg); } catch (Exception ex) { Console.WriteLine(ex); } finally { if (esw != null) esw.Close(); } #endregion } /// <summary> /// 检测日志文件是否存在,不存在则创建 /// </summary> private static void CheckFileExist() { string filename = string.Format("{0}_{1}.Log", LogFielPrefix, DateTime.Now.ToString("yyyy-MM-dd")); FilePath = string.Format("{0}{1}", LogPath, filename); EFilePath = string.Format("{0}/Encrypt{1}", LogPath, filename); //未加密的文件如果不存在则创建 if (!File.Exists(FilePath)) { using (File.Create(FilePath)) { File.SetAttributes(FilePath, FileAttributes.Normal); FileAttributes myAttributes = File.GetAttributes(FilePath); File.SetAttributes(FilePath, myAttributes | FileAttributes.System); myAttributes = File.GetAttributes(FilePath); File.SetAttributes(FilePath, myAttributes | FileAttributes.Hidden); myAttributes = File.GetAttributes(FilePath); File.SetAttributes(FilePath, myAttributes | FileAttributes.Archive); File.GetAttributes(FilePath); } } //加密的文件如果不存在则创建 if (!File.Exists(EFilePath)) { FileStream fs = File.Create(EFilePath); fs.Close(); } } /// <summary> /// 加密字符串 /// </summary> /// <param name="oldMsg"></param> /// <returns></returns> private static string EncryptString(string oldMsg) { try { string enKey = "99999999"; string enIV = "88888888"; string enSourceString = EncryptClass.Encrypt(oldMsg, enKey, enIV); return enSourceString; } catch (Exception ex) { return string.Format("日志加密出错，只能打印加密报的错:{0}", ex.Message); } } /// <summary> /// 写日志 /// </summary> public static void WriteLog(LogType logType, string msg) { WriteLog(logType.ToString(), msg); } } /// <summary> /// 日志类型 /// </summary> public enum LogType { Trace, //堆栈跟踪信息 Warning,//警告信息 Error, //错误信息应该包含对象名、发生错误点所在的方法名称、具体错误信息 SQL //与数据库相关的信息 } public class EncryptClass { public static string Encrypt(string sourceString, string key, string iv) { try { byte[] btKey = Encoding.UTF8.GetBytes(key); byte[] btIV = Encoding.UTF8.GetBytes(iv); DESCryptoServiceProvider des = new DESCryptoServiceProvider(); using (MemoryStream ms = new MemoryStream()) { byte[] inData = Encoding.UTF8.GetBytes(sourceString); try { using (CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(btKey, btIV), CryptoStreamMode.Write)) { cs.Write(inData, 0, inData.Length); cs.FlushFinalBlock(); } return Convert.ToBase64String(ms.ToArray()); } catch { return sourceString; } } } catch { } return "DES加密出错！"; } public static string Decrypt(string encryptedString, string key, string iv) { byte[] btKey = Encoding.UTF8.GetBytes(key); byte[] btIV = Encoding.UTF8.GetBytes(iv); DESCryptoServiceProvider des = new DESCryptoServiceProvider(); using (MemoryStream ms = new MemoryStream()) { byte[] inData = Convert.FromBase64String(encryptedString); try { using (CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(btKey, btIV), CryptoStreamMode.Write)) { cs.Write(inData, 0, inData.Length); cs.FlushFinalBlock(); } return Encoding.UTF8.GetString(ms.ToArray()); } catch { return encryptedString; } } } }
2.使用
（1）WMSLog.WriteLog(LogType.Trace, string.Format("发送的数据：cmd:{0}; json:{1}", pacSend.cmd, GetRequestJson()));
pacSend.cmd：协议命令字
GetRequestJson()：发送的数据
（2）Stopwatch 用来记录网络请求耗时
Stopwatch timeWatch = new Stopwatch()；
timeWatch.Start();
WMSLog.WriteLog(LogType.Trace, string.Format("{0}开始网络请求", pacSend.cmd));
timeWatch.Stop();
long watchTime = timeWatch.ElapsedMilliseconds;
WMSLog.WriteLog(LogType.Trace, string.Format("{0}请求耗时：{1} ms", pacSend.cmd, watchTime.ToString()));
（3） WMSLog.WriteLog(LogType.Trace, string.Format("服务端返回的数据：cmd:{0}; json:{1}", pacSend.cmd, GetResponseJson()));
（4）Warning类型，多放在try catch中
WMSLog.WriteLog(LogType.Warning, "下载模板失败");
（5）Error类型错误，多放在try catch中
WMSLog.WriteLog(LogType.Error, string.Format("检查网络连接状态：{0}", e.ToString()));
