Remove ThreadAgnostic from AssemblyVersionLayoutRenderer when ASP.NET

src/Shared/LayoutRenderers/AssemblyVersionLayoutRenderer.cs

@@ -1,6 +1,4 @@
-using System;
-using System.Linq;
-using System.Reflection;
+using System.Reflection;
 using System.Text;
 using NLog.Common;
 using NLog.Config;
@@ -16,6 +14,14 @@ namespace NLog.Web.LayoutRenderers
     [ThreadSafe]
     public class AssemblyVersionLayoutRenderer : NLog.LayoutRenderers.AssemblyVersionLayoutRenderer
     {
+#if !ASP_NET_CORE
+        /// <summary>
+        /// Support capture of Assembly-Version from active HttpContext
+        /// </summary>
+        public LayoutRenderer ThreadAgnostic => string.IsNullOrEmpty(Name) ? _threadAgnostic : null;
+        private readonly LayoutRenderer _threadAgnostic = new ThreadIdLayoutRenderer();
+#endif
+
         /// <inheritdoc />
         protected override void Append(StringBuilder builder, LogEventInfo logEvent)
         {
@@ -28,33 +34,25 @@ protected override void Append(StringBuilder builder, LogEventInfo logEvent)
         protected override Assembly GetAssembly()
         {
             var assembly = base.GetAssembly();
-
 #if !ASP_NET_CORE
             if (assembly == null)
             {
                 assembly = GetAspNetEntryAssembly();
             }
 #endif
-
             return assembly;
         }
 
 #if !ASP_NET_CORE
-        private static System.Reflection.Assembly GetAspNetEntryAssembly()
+        private static Assembly GetAspNetEntryAssembly()
         {
-            if (System.Web.HttpContext.Current == null || System.Web.HttpContext.Current.ApplicationInstance == null)
+            var applicatonType = System.Web.HttpContext.Current?.ApplicationInstance?.GetType();
+            while (applicatonType != null && applicatonType.Namespace == "ASP")
             {
-                return null;
+                applicatonType = applicatonType.BaseType;
             }
-
-            var type = System.Web.HttpContext.Current.ApplicationInstance.GetType();
-            while (type != null && type.Namespace == "ASP")
-            {
-                type = type.BaseType;
-            }
-            return type != null ? type.Assembly : null;
+            return applicatonType?.Assembly;
         }
-
 #endif
     }
 }

tests/Shared/LayoutRenderers/AssemblyVersionLayoutRendererTests.cs

@@ -5,7 +5,7 @@
 
 namespace NLog.Web.Tests.LayoutRenderers
 {
-    public class AssemblyVersionLayoutRendererTests : TestBase
+    public class AssemblyVersionLayoutRendererTests : TestInvolvingAspNetHttpContext
     {
 #if ASP_NET_CORE
         private const string AssemblyName = "NLog.Web.AspNetCore.Tests";
@@ -42,5 +42,33 @@ public void AssemblyNameInformationalVersionTest()
 
             Assert.Equal("1.2.3.2", result);
         }
+
+#if !ASP_NET_CORE
+        class TestAplication : System.Web.HttpApplication
+        {
+        }
+
+        [Fact]
+        public void HttpContextAssemblyNameVersionTest()
+        {
+            HttpContext.ApplicationInstance = new TestAplication();
+
+            var logFactory = new LogFactory().Setup().SetupExtensions(evt => evt.RegisterAssembly(typeof(IHttpContextAccessor).Assembly)).LoadConfigurationFromXml(@"
+                <nlog throwConfigExceptions='true'>
+                    <targets async='true'>
+                        <target name='memory' type='memory' layout='${assembly-version}' />
+                    </targets>
+                    <rules>
+                        <logger name='*' writeTo='memory' />
+                    </rules>
+                </nlog>
+            ").LogFactory;
+            var target = logFactory.Configuration.AllTargets.OfType<NLog.Targets.MemoryTarget>().First();
+            var logger = logFactory.GetCurrentClassLogger();
+            logger.Info("Hello");
+            logFactory.Flush();
+            Assert.Equal("1.2.3.0", target.Logs.First());
+        }
+#endif
     }
 }

tests/Shared/LayoutRenderers/TestInvolvingAspNetHttpContext.cs

@@ -1,25 +1,15 @@
 using System;
-using System.Collections;
 using System.IO;
-using System.Reflection;
 #if !ASP_NET_CORE
 using System.Web;
-using System.Web.Routing;
-using System.Collections.Specialized;
-using System.Web.SessionState;
 #else
-using Microsoft.Extensions.Primitives;
-using HttpContextBase = Microsoft.AspNetCore.Http.HttpContext;
 using HttpContext = Microsoft.AspNetCore.Http.HttpContext;
 using Microsoft.AspNetCore.Http;
 using NSubstitute;
 #endif
 using System.Xml;
-
 using NLog.Config;
 
-using Xunit;
-
 namespace NLog.Web.Tests.LayoutRenderers
 {
     public abstract class TestInvolvingAspNetHttpContext : TestBase, IDisposable
@@ -108,17 +98,5 @@ protected virtual HttpResponse SetUpHttpResponse(HttpContext context)
         }
 
 #endif
-
-        protected NLog.Targets.DebugTarget GetDebugTarget(string targetName, LoggingConfiguration configuration)
-        {
-            var debugTarget = (NLog.Targets.DebugTarget)configuration.FindTargetByName(targetName);
-            Assert.NotNull(debugTarget);
-            return debugTarget;
-        }
-
-        protected string GetDebugLastMessage(string targetName, LoggingConfiguration configuration)
-        {
-            return GetDebugTarget(targetName, configuration).LastMessage;
-        }
     }
 }