NLog isn't writing an empty custom event propperties into SqlDatabase

Question

I have a few custom event layouts in my configuration like this {event-properties:item=SomeCustomProperty}

Filling them out like this:

var testLogger = testNLogFactory.GetLogger("Test");
LogEventInfo theEvent = new LogEventInfo(LogLevel.Debug, null, "Test");
theEvent.Properties.Add("SomeCustomProperty", null);
testLogger.Debug(theEvent);

I have 2 targets, file and database. File target works fine but in case of database this record won't be written as long as SomeCustomProperty value stays null. If I replace null with any value, it works just fine.

The corresponding table in the database is correct and allows NULL values in SomeCustomProperty but if {event-properties:item=SomeCustomProperty} has no value the record won't be added to the database.

Is there any reason for this behavior? Is there any workaround?

Answer 1

所有布局渲染器，例如${event-properties:item=SomeCustomProperty} ，如果为空，则将返回一个空字符串，并且不为null