Activation error occured while trying to get instance of type LogWriter, key “”?

Question

I have asp.net web site. I added reference of Microsoft.Practices.EnterpriseLibrary.Logging.dll to the site.

in web.cofig file, I defined like below.

Answer 1

Your full config references trace listeners that are not defined. This is causing the Enterprise Library runtime to throw a runtime exception when it tries to resolve those references.

I commented out the unused listeners (and changed the default category to Important) and it is working:

The clue is in the inner exception. At the end of the InnerException.Message it says:

Resolving System.Diagnostics.TraceListener,Formatted EventLog TraceListener

The above config is in app.config. Then Program.cs contains:

class Program
{
    static void Main(string[] args)
    {
        LogWriter logWriter = EnterpriseLibraryContainer.Current.GetInstance();
        logWriter.Write("Test");
     }
}