Log4Net没有写入SQL表

Question

Can someone off a 2nd set of eyes? I am clearly missing something.

I'm using Log4Net in a Web API app. Whenever I invoke a Log.Error() it executes, but nothing actually gets written to my dbo.Log table. I am running a local database. When I replaced the configuration with one that wrote to a file, the code worked perfectly.

Here is what my configuration and code looks like.

The Log4Net.config file contains the following:

 <?xml version="1.0" encoding="utf-8" ?> <configuration> <configSections> <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" /> </configSections> <log4net> <appender name="AdoNetAppender" type="log4net.Appender.AdoNetAppender"> <bufferSize value="100" /> <connectionType value="System.Data.SqlClient.SqlConnection, System.Data, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" /> <connectionString value="Data Source=MUD-DAD\\SQLEXPRESS;Initial Catalog=FitAchiever;Persist Security Info=True;User ID=sa;Password=asdadf334"/> <commandText value="INSERT INTO dbo.Log ([Date],[Thread],[Level],[Logger],[Message],[Exception]) VALUES (@log_date, @thread, @log_level, @logger, @message, @exception)" /> <parameter> <parameterName value="@log_date" /> <dbType value="DateTime" /> <layout type="log4net.Layout.RawTimeStampLayout" /> </parameter> <parameter> <parameterName value="@thread" /> <dbType value="String" /> <size value="255" /> <layout type="log4net.Layout.PatternLayout"> <conversionPattern value="%thread" /> </layout> </parameter> <parameter> <parameterName value="@log_level" /> <dbType value="String" /> <size value="50" /> <layout type="log4net.Layout.PatternLayout"> <conversionPattern value="%level" /> </layout> </parameter> <parameter> <parameterName value="@logger" /> <dbType value="String" /> <size value="255" /> <layout type="log4net.Layout.PatternLayout"> <conversionPattern value="%logger" /> </layout> </parameter> <parameter> <parameterName value="@message" /> <dbType value="String" /> <size value="4000" /> <layout type="log4net.Layout.PatternLayout"> <conversionPattern value="%message" /> </layout> </parameter> <parameter> <parameterName value="@exception" /> <dbType value="String" /> <size value="2000" /> <layout type="log4net.Layout.ExceptionLayout" /> </parameter> </appender> <root> <level value="DEBUG"/> <appender-ref ref="AdoNetAppender"/> </root> </log4net> </configuration> 

The Global.asax.cs file contains the following, note the call to the Log4Net.Config() method which specifies which config to use.

    public class WebApiApplication : System.Web.HttpApplication
{
    private static readonly log4net.ILog Log = log4net.LogManager.GetLogger(typeof(WebApiApplication));
    protected void Application_Start()
    {

        log4net.Config.XmlConfigurator.Configure(new System.IO.FileInfo(Server.MapPath("Log4Net.config")));

        AreaRegistration.RegisterAllAreas();
        GlobalConfiguration.Configure(WebApiConfig.Register);
        FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
        RouteConfig.RegisterRoutes(RouteTable.Routes);
        BundleConfig.RegisterBundles(BundleTable.Bundles);
    }
}

}

The initialization of the logger in my Controller is:

   public class FitDashboardController : ApiController
{
    private static readonly ILog log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);

    IFitDashboardService fitDashboardService = new FitDashboardService();

...

And the call is:

            catch (System.Exception ex)
        {
            log.Error("Error:" + MethodBase.GetCurrentMethod().Name + " :: " + ex.Message);

        }

Again, the code works when writing to a file, but not the database. Any ideas?

Answer 1

This question has been answered here . The problem is your <bufferSize> tag, which according to the linked answer...

 <bufferSize value="100" /> 

It is saying that it will keep 100 logs in memory until written into DB. Maybe that's why you don't see anything in DB?

Change your code to say <bufferSize value="1" /> and this should cause log4net to write to your database after keeping 1 log in memory. See Apache's documentation on buffersize for more details.

Answer 2

Have you tried running sql server profiler and doing a trace against the database in the connection string? The insert statement log4net submits should show up along with values for the various parameters.