diff --git a/src/NLog.Web.AspNetCore/AspNetExtensions.cs b/src/NLog.Web.AspNetCore/AspNetExtensions.cs
index c48e272b..539d0df1 100644
--- a/src/NLog.Web.AspNetCore/AspNetExtensions.cs
+++ b/src/NLog.Web.AspNetCore/AspNetExtensions.cs
@@ -149,7 +149,7 @@ public static ILoggingBuilder AddNLogWeb(this ILoggingBuilder builder, string co
             {
                 var provider = CreateNLogLoggerProvider(serviceProvider, config, env, options);
                 // Delay initialization of targets until we have loaded config-settings
-                LogManager.LoadConfiguration(configFileName);
+                provider.LogFactory.Setup().LoadConfigurationFromFile(configFileName);
                 return provider;
             });
             return builder;
diff --git a/src/Shared/LayoutRenderers/AspNetRequestHeadersLayoutRenderer.cs b/src/Shared/LayoutRenderers/AspNetRequestHeadersLayoutRenderer.cs
index fbb7ff3c..1ca27025 100644
--- a/src/Shared/LayoutRenderers/AspNetRequestHeadersLayoutRenderer.cs
+++ b/src/Shared/LayoutRenderers/AspNetRequestHeadersLayoutRenderer.cs
@@ -1,12 +1,11 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
+using System.Linq;
 using System.Text;
-using NLog.Config;
 using NLog.LayoutRenderers;
 using NLog.Web.Internal;
-using System;
 #if !ASP_NET_CORE
 using System.Collections.Specialized;
-using System.Linq;
 #else
 using Microsoft.AspNetCore.Http;
 #endif
@@ -78,7 +77,7 @@ protected override void DoAppend(StringBuilder builder, LogEventInfo logEvent)
 #if !ASP_NET_CORE
         private IEnumerable<KeyValuePair<string, string>> GetHeaderValues(NameValueCollection headers, bool checkForExclude)
         {
-            var headerNames = HeaderNames?.Count > 0 ? HeaderNames : headers.Keys.Cast<string>().ToList();
+            var headerNames = HeaderNames?.Count > 0 ? HeaderNames : headers.Keys.Cast<string>();
             foreach (var headerName in headerNames)
             {
                 if (checkForExclude && Exclude.Contains(headerName))
diff --git a/src/Shared/LayoutRenderers/AspNetRequestQueryStringLayoutRenderer.cs b/src/Shared/LayoutRenderers/AspNetRequestQueryStringLayoutRenderer.cs
index f054230d..e381acc7 100644
--- a/src/Shared/LayoutRenderers/AspNetRequestQueryStringLayoutRenderer.cs
+++ b/src/Shared/LayoutRenderers/AspNetRequestQueryStringLayoutRenderer.cs
@@ -1,16 +1,12 @@
 using System;
 using System.Collections.Generic;
-using System.Linq;
 using System.Text;
-using NLog.Config;
 using NLog.LayoutRenderers;
 using NLog.Web.Internal;
 #if !ASP_NET_CORE
 using System.Collections.Specialized;
-using System.Web;
 #else
 using Microsoft.AspNetCore.Http;
-
 #endif
 
 namespace NLog.Web.LayoutRenderers
@@ -48,17 +44,19 @@ protected override void DoAppend(StringBuilder builder, LogEventInfo logEvent)
                 return;
             }
 
-            var printAllQueryString = QueryStringKeys == null || QueryStringKeys.Count == 0;
-            var queryStringKeys = QueryStringKeys;
 #if !ASP_NET_CORE
             var queryStrings = httpRequest.QueryString;
+#else
+            var queryStrings = httpRequest.Query;
+#endif
             if (queryStrings == null || queryStrings.Count == 0)
                 return;
 
+            var queryStringKeys = QueryStringKeys;
+            var printAllQueryString = queryStringKeys == null || queryStringKeys.Count == 0;
             if (printAllQueryString)
             {
-                queryStringKeys = new List<string>(queryStrings.Keys.Count);
-
+                queryStringKeys = new List<string>(queryStrings.Count);
                 foreach (var key in queryStrings.Keys)
                 {
                     if (key != null)
@@ -67,18 +65,6 @@ protected override void DoAppend(StringBuilder builder, LogEventInfo logEvent)
                     }
                 }
             }
-#else
-            var queryStrings = httpRequest.Query;
-            if (queryStrings == null || queryStrings.Count == 0)
-            {
-                return;
-            }
-
-            if (printAllQueryString)
-            {
-                queryStringKeys = queryStrings.Keys.ToList();
-            }
-#endif
 
             var pairs = GetPairs(queryStrings, queryStringKeys);
             SerializePairs(pairs, builder, logEvent);
diff --git a/src/Shared/LayoutRenderers/AspNetRequestRouteParametersRenderer.cs b/src/Shared/LayoutRenderers/AspNetRequestRouteParametersRenderer.cs
index e19a4198..233c32b5 100644
--- a/src/Shared/LayoutRenderers/AspNetRequestRouteParametersRenderer.cs
+++ b/src/Shared/LayoutRenderers/AspNetRequestRouteParametersRenderer.cs
@@ -48,14 +48,13 @@ protected override void DoAppend(StringBuilder builder, LogEventInfo logEvent)
 #else
             RouteValueDictionary routeParameters = context.GetRouteData()?.Values;
 #endif
-
-            bool printAllRouteParameter = RouteParameterKeys == null || RouteParameterKeys.Count == 0;
-            List<string> routeParameterKeys = RouteParameterKeys;
             if (routeParameters == null || routeParameters.Count == 0)
             {
                 return;
             }
 
+            var routeParameterKeys = RouteParameterKeys;
+            bool printAllRouteParameter = routeParameterKeys == null || routeParameterKeys.Count == 0;
             if (printAllRouteParameter)
             {
                 routeParameterKeys = routeParameters.Keys.ToList();
@@ -70,13 +69,12 @@ private static IEnumerable<KeyValuePair<string, string>> GetPairs(RouteValueDict
             foreach (string key in routeParameterKeys)
             {
                 // This platform specific code is to prevent an unncessary .ToString call otherwise. 
-
                 if (!routeParameters.TryGetValue(key, out object objValue))
                 {
                     continue;
                 }
 
-                string value = objValue.ToString();
+                string value = objValue?.ToString();
                 if (!string.IsNullOrEmpty(value))
                 {
                     yield return new KeyValuePair<string, string>(key, value);