NLog 正在写入文件但未写入数据库表

Question

This is my NLog.config file:

<?xml version="1.0" encoding="utf-8" ?>
    <nlog xmlns="http://www.nlog-project.org/schemas/NLog.xsd"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://www.nlog-project.org/schemas/NLog.xsd NLog.xsd"
          autoReload="true"
          throwExceptions="false"
          internalLogLevel="Off" internalLogFile="c:\temp\nlog-internal.log" >

      <variable name="myvar" value="myvalue"/>

      <targets>

        <target name="database" xsi:type="Database"
                dbUserName="internwebuser"
                dbProvider="System.Data.SqlClient"
                connectionStringName="SECURE"
                connectionString="Data Source=sqlservtest.starledger.com;Initial Catalog=SECURE;User ID=webuser;Password=password"
                commandText="insert into dbo.tracelog (custom_message, excep_message, insertdate) 
                values 
                (@custom_message, @excep_message, @insertdate);" >


          <parameter name="@custom_message"     layout="${exception}" />
          <parameter name="@excep_message"      layout="${exception:tostring}" />
          <parameter name="@insertdate"         layout="${date}" />


        </target>


        <target name="file" xsi:type="File"
                layout="${longdate} ${uppercase:${level}} ${callsite} from Line: ${callsite-linenumber} ${newline} 
    ${exception} ${newline}
    ${exception:tostring} ${newline}"
                fileName="${basedir}/logs/${shortdate}-${level}.log" />


      </targets>  

      <rules>

        <logger name="*" minlevel="Debug" writeTo="file" />
        <logger name="*" minlevel="Debug" writeTo="database" />

      </rules>
    </nlog>

And my controller looks something like this:

public class ReportController : Controller
{
    private static Logger logger = LogManager.GetCurrentClassLogger();

    public ActionResult Index()
    {
        try 
        {
            <!-- some statement -->
        }
        catch (Exception e)
        {
            logger.Error(e);
        }
        return View();
   }
}

This code writes perfectly into the file but the database table remains empty. Also, in my file, when I do it using StreamWriter and create a file instead of using NLog, the application writes 2/3 kinds of error into the file simultaneously. But NLog only writes the last error.

For example:

In case of StreamWriter , the errors are:

Exception Name:ExecuteReader requires an open and available Connection. The connection's current state is closed.

Exception Name:Object reference not set to an instance of an object.

But In case of NLog, I only get:

Exception Name:Object reference not set to an instance of an object.
and the first one is missed out.

My StreamWriter method looks like this:

DateTime today = DateTime.Now;

            string path = Directory.GetCurrentDirectory();

            string fileName = "error-log-" + today.Date.ToString("MM-dd-yyyy") + ".txt";

            var file = Path.Combine(path, fileName);

            StreamWriter log;

            if (!File.Exists(file))
            {
                log = new StreamWriter(file);
            }

            else
            {
                log = File.AppendText(file);
            }

            // Write to the file:

            log.WriteLine("Data Time:" + DateTime.Now);    
            log.WriteLine("Exception Name:" + sExceptionName);    
            log.WriteLine("Event Name:" + sEventName);    
            log.WriteLine("Error Line No.:" + nErrorLineNo);    

            // Close the stream:

            log.Close();

and I pass the method into the catch section of my controller.

My main issue here is writing into the database table, although I'd appreciate help in writing all the errors too, using Nlog, instead of just the last one.

Answer 1

请启用内部日志记录以获取更多信息

Answer 2

I faced the same issue.To find the exact issue I added <nlog internalLogFile="c:\\DemoLogs\\nlog-internal.txt" and internalLogLevel="Error"> inside the nlog tag. which will write the exact proplem to the log file

For my case Could not load file or assembly 'System.Data.SqlClient was resolved when I installed that nuget package.