当 NLog 配置为从代码登录时，它不会登录数据库

Question

我有以下控制台应用程序，它使用编程配置使用 NLog 实现日志记录。目前，它尚未登录数据库，并且在运行时也不会抛出任何异常。有人可以让我知道其背后的原因吗？

using NLog;
using NLog.Config;
using NLog.Targets;
using System;

namespace Test.Logger
{
    class Program
    {
        static void Main(string[] args)
        {
            var logConfig = new LoggingConfiguration();


            //dbtarget 2
            var dbTarget2 = new DatabaseTarget();
            dbTarget2.ConnectionString = "SomeConnectionString";
            dbTarget2.CommandText = @"INSERT INTO [dbo].[LogAppDetail]
                                                   ([LogAppIS]
                                                   ,[LogAppId]
                                                   ,[DN]
                                                   ,[DV])
                                             VALUES
                                                   (@LogAppIS
                                                   ,@LogAppId
                                                   ,@DN
                                                   ,@DV)";

            dbTarget2.Parameters.Add(new DatabaseParameterInfo("@LogAppIS", new NLog.Layouts.SimpleLayout("${event-properties:LogAppIS}")));
            dbTarget2.Parameters.Add(new DatabaseParameterInfo("@LogAppId", new NLog.Layouts.SimpleLayout("${event-properties:LogAppId}")));
            dbTarget2.Parameters.Add(new DatabaseParameterInfo("@DN", new NLog.Layouts.SimpleLayout("${event-properties:DN}")));
            dbTarget2.Parameters.Add(new DatabaseParameterInfo("@DV", new NLog.Layouts.SimpleLayout("${event-properties:DV}")));

            logConfig.AddTarget("dbTarget2", dbTarget2);
            // add rules
            var rule2 = new LoggingRule("LogAppDetail", LogLevel.Trace, dbTarget2);
            logConfig.LoggingRules.Add(rule2);
            LogManager.Configuration = logConfig;

            LogEventInfo theEvent = new LogEventInfo(LogLevel.Debug, "", "Pass my custom value");
            theEvent.Properties["LogAppIS"] = "12345698";
            theEvent.Properties["LogAppId"] = "1235";
            theEvent.Properties["DN"] = "DN";
            theEvent.Properties["DV"] = "DV";
            var log = NLog.LogManager.GetLogger("LogAppDetail");
            log.Log(theEvent);
        }
    }
}

Answer 1

对于任何仍在为此苦苦挣扎的人，如此处所述，为了使 NLog 5.0 及更高版本中的功能正常工作，您必须包含 nuget 包 Nlog.Database

所以，这应该会起作用：

<PackageReference Include="NLog.Database" Version="5.0.2" />