# Microsoft.Extensions.Logging.TraceSource

``` diff
 namespace Microsoft.Extensions.Logging.TraceSource {
     public class TraceSourceLoggerProvider : IDisposable, ILoggerProvider {
-        public TraceSourceLoggerProvider(SourceSwitch rootSourceSwitch, TraceListener rootTraceListener);
+        public TraceSourceLoggerProvider(SourceSwitch rootSourceSwitch, TraceListener? rootTraceListener);
     }
 }
```

