Log4Net记录错误仅一次

Question

I am trying to log error using log4net in asp.net MVC5 c#.

For test purpose, I have configured log4net in application_start and initialize logger and log error from home controller. For some reason, log4net only logs error for the first time when I start the application. When I navigate away from homecontroller and come back to home controller again, no error is logged. I have put my logging code in HomeController index. When debugged using breakpoint, the logging code is reachable but the log is not recorded.

Am I missing anything?

Here is my log4net configuration.

1. Configured log4net in Global.asax Application_Start() as

    log4net.Config.XmlConfigurator.Configure(); 

2. In my home controller index (For Testing), I am logging error as

    var logger = log4net.LogManager.GetLogger(this.GetType()); Random rnd = new Random(); int rndint = rnd.Next(52); logger.Error(rndint.ToString()); 

3. My config file is using standard log4net AdoNetAppender with buffer size=100 and level is set to WARN

Answer 1

AdoNetAppender batches log statements that are inserted into the database. If you set the buffer size to 1 you will see the log statements are added to the table immediately.

The best thing to do is use a buffer size of 1 for local development, and use a larger value when deployed to production if performance is a concern and lots of logging is used.