NLogProviderOptions - Use LogFactory from provider when using LoggingConfigurationSectionName (#508)

Author: snakefoot

src/NLog.Extensions.Logging/Config/SetupBuilderExtensions.cs

@@ -17,10 +17,14 @@ public static ISetupBuilder LoadConfigurationFromSection(this ISetupBuilder setu
             if (!string.IsNullOrEmpty(configSection))
             {
                 var nlogConfig = configuration.GetSection(configSection);
-                if (nlogConfig?.GetChildren().Any() == true)
+                if (nlogConfig?.GetChildren()?.Any() == true)
                 {
                     setupBuilder.LogFactory.Configuration = new NLogLoggingConfiguration(nlogConfig, setupBuilder.LogFactory);
                 }
+                else
+                {
+                    Common.InternalLogger.Debug("Skip loading NLogLoggingConfiguration from empty config section: {0}", configSection);
+                }
             }
             return setupBuilder;
         }

src/NLog.Extensions.Logging/Internal/RegisterNLogLoggingProvider.cs

@@ -47,10 +47,14 @@ internal static void TryLoadConfigurationFromSection(this NLogLoggerProvider log
                 {
                     if (configBuilder.Configuration.LoggingRules.Count == 0 && configBuilder.Configuration.AllTargets.Count == 0)
                     {
-                        configBuilder.Configuration = new NLogLoggingConfiguration(nlogConfig);
+                        configBuilder.Configuration = new NLogLoggingConfiguration(nlogConfig, loggerProvider.LogFactory);
                     }
                 });
             }
+            else
+            {
+                Common.InternalLogger.Debug("Skip loading NLogLoggingConfiguration from empty config section: {0}", loggerProvider.Options.LoggingConfigurationSectionName);
+            }
         }
     }
 }