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private static Logger processLogger;  // ① LnProcessDBLog标签 LogManager.GetLogger("LnProcessDBLog");②使用前先保证不为null，否则InitNlog();    // 修改Nlog.config配置的文件    private static void InitNlog()    {        LoggingConfiguration loggingConfiguration = NLog.LogManager.Configuration;        var rule = loggingConfiguration.LoggingRules.Where(a => a.LoggerNamePattern == "LnProcessDBLog")?.FirstOrDefault();        // 方式一：        //var targetDB = rule.target....FirstOrDefault() ;  // 找到DatabaseTarget；不能转化为DatabaseTarget        //targetDB.con  // 找不到类型且找到也不可修改，只有get属性            // 方式二：先删除再添加新的        if (rule != null)        {            loggingConfiguration.LoggingRules.Remove(rule);  // 移除原来的DatabaseTarget配置        }        var logDatabase = new NLog.Targets.DatabaseTarget("LnProcessDBLog");        logDatabase.DBProvider = "System.Data.SqlClient";  // 使用的连接类库        string _connectionString = ConfigurationManager.AppSettings["DefaultConnection"];  // 加密的连接字符串        logDatabase.ConnectionString = AESEncryptHelper.Decode(_connectionString);  // 解密连接字符串        logDatabase.CommandType = CommandType.Text;  // 默认为CommandType.Text        logDatabase.CommandText = @"INSERT INTO [SYS_LOG_DETAILS]([LogDate],[LogThread],[LogLevel],[LogLogger],[LogMessage],[LogActionClick],[UserName],[UserIP],[LogOrder]) VALUES(@LogDate,@LogThread,@LogLevel,@LogLogger,@LogMessage,@LogActionClick,@UserName,@UserIP,@LogOrder)";        logDatabase.Parameters.Add(new DatabaseParameterInfo() { Name = "@LogDate", Layout = "${event-properties:item=LogDate}" });        logDatabase.Parameters.Add(new DatabaseParameterInfo() { Name = "@LogThread", Layout = "${event-properties:item=LogThread}" });        logDatabase.Parameters.Add(new DatabaseParameterInfo() { Name = "@LogLevel", Layout = "${event-properties:item=LogLevel}" });        logDatabase.Parameters.Add(new DatabaseParameterInfo() { Name = "@LogLogger", Layout = "${event-properties:item=LogLogger}" });        logDatabase.Parameters.Add(new DatabaseParameterInfo() { Name = "@LogMessage", Layout = "${event-properties:item=LogMessage}" });        logDatabase.Parameters.Add(new DatabaseParameterInfo() { Name = "@LogActionClick", Layout = "${event-properties:item=LogActionClick}" });        logDatabase.Parameters.Add(new DatabaseParameterInfo() { Name = "@LogOrder", Layout = "测试" });        logDatabase.Parameters.Add(new DatabaseParameterInfo() { Name = "@UserName", Layout = "${event-properties:item=UserName}" });        logDatabase.Parameters.Add(new DatabaseParameterInfo() { Name = "@UserIP", Layout = "${event-properties:item=UserIP}" });        loggingConfiguration.AddRule(LogLevel.Trace, LogLevel.Fatal, logDatabase, "LnProcessDBLog", true);  // 添加新的DatabaseTarget配置        NLog.LogManager.Configuration = loggingConfiguration;  // 赋值给NLog.LogManager.Configuration。        processLogger = LogManager.GetLogger("LnProcessDBLog");  // 重新给全局变量赋值。    }