diff --git a/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/ActivityTracker.cs b/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/ActivityTracker.cs
index 07c2112878f9c7..9f46e13c38305f 100644
--- a/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/ActivityTracker.cs
+++ b/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/ActivityTracker.cs
@@ -228,7 +228,7 @@ public void Enable()
                 }
                 catch (NotImplementedException)
                 {
-#if (!ES_BUILD_PCL && !ES_BUILD_PN)
+#if (!ES_BUILD_PCL)
                     // send message to debugger without delay
                     System.Diagnostics.Debugger.Log(0, null, "Activity Enabled() called but AsyncLocals Not Supported (pre V4.6).  Ignoring Enable");
 #endif
@@ -381,7 +381,7 @@ private unsafe void CreateActivityPathGuid(out Guid idRet, out int activityPathG
                     {
                         // TODO FIXME - differentiate between AD inside PCL
                         int appDomainID = 0;
-#if (!ES_BUILD_STANDALONE && !ES_BUILD_PN)
+#if (!ES_BUILD_STANDALONE)
                         appDomainID = System.Threading.Thread.GetDomainID();
 #endif
                         // We start with the appdomain number to make this unique among appdomains.
diff --git a/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventDescriptor.cs b/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventDescriptor.cs
index 02ba4d715ea4c9..5bdc4c3ee68750 100644
--- a/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventDescriptor.cs
+++ b/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventDescriptor.cs
@@ -18,21 +18,7 @@ namespace System.Diagnostics.Tracing
 #if ES_BUILD_STANDALONE
     [System.Security.Permissions.HostProtection(MayLeakOnAbort = true)]
 #endif
-
-    /*
-     EventDescriptor was public in the separate System.Diagnostics.Tracing assembly(pre NS2.0),
-     now the move to CoreLib marked them as private.
-     While they are technically private (it's a contract used between the library and the ILC toolchain),
-     we need them to be rooted and exported from shared library for the system to work.
-     For now I'm simply marking them as public again.A cleaner solution might be to use.rd.xml to
-     root them and modify shared library definition to force export them.
-     */
-#if ES_BUILD_PN
-    public
-#else
-    internal
-#endif
-    struct EventDescriptor
+    internal struct EventDescriptor
     {
         #region private
         [FieldOffset(0)]
diff --git a/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventProvider.cs b/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventProvider.cs
index dbc70abfb741db..850c12eac99d27 100644
--- a/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventProvider.cs
+++ b/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventProvider.cs
@@ -610,7 +610,7 @@ private unsafe bool GetDataFromController(int etwSessionId,
             dataStart = 0;
             if (filterData == null)
             {
-#if (!ES_BUILD_PCL && !ES_BUILD_PN && TARGET_WINDOWS)
+#if (!ES_BUILD_PCL && TARGET_WINDOWS)
                 string regKey = @"\Microsoft\Windows\CurrentVersion\Winevt\Publishers\{" + m_providerId + "}";
                 if (IntPtr.Size == 8)
                     regKey = @"Software\Wow6432Node" + regKey;
diff --git a/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventSource.cs b/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventSource.cs
index a62a188c618541..63d0b386bff26d 100644
--- a/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventSource.cs
+++ b/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventSource.cs
@@ -649,15 +649,9 @@ protected EventSource(EventSourceSettings settings, params string[]? traits)
         {
             m_config = ValidateSettings(settings);
 
-
-            GetMetadata(out Guid eventSourceGuid, out string? eventSourceName, out _, out _);
-
-            if (eventSourceGuid.Equals(Guid.Empty) || eventSourceName == null)
-            {
-                Type myType = this.GetType();
-                eventSourceGuid = GetGuid(myType);
-                eventSourceName = GetName(myType);
-            }
+            Type myType = this.GetType();
+            Guid eventSourceGuid = GetGuid(myType);
+            string eventSourceName = GetName(myType);
 
             Initialize(eventSourceGuid, eventSourceName, traits);
         }
@@ -709,25 +703,6 @@ private unsafe void DefineEventPipeEvents()
         }
 #endif
 
-        internal virtual void GetMetadata(out Guid eventSourceGuid, out string? eventSourceName, out EventMetadata[]? eventData, out byte[]? manifestBytes)
-        {
-            //
-            // In ProjectN subclasses need to override this method, and return the data from their EventSourceAttribute and EventAttribute annotations.
-            // On other architectures it is a no-op.
-            //
-            // eventDescriptors needs to contain one EventDescriptor for each event; the event's ID should be the same as its index in this array.
-            // manifestBytes is a UTF-8 encoding of the ETW manifest for the type.
-            //
-            // This will be implemented by an IL rewriter, so we can't make this method abstract or the initial build of the subclass would fail.
-            //
-            eventSourceGuid = Guid.Empty;
-            eventSourceName = null;
-            eventData = null;
-            manifestBytes = null;
-
-            return;
-        }
-
         /// <summary>
         /// This method is called when the eventSource is updated by the controller.
         /// </summary>
@@ -1469,7 +1444,7 @@ private unsafe void Initialize(Guid eventSourceGuid, string eventSourceName, str
                 m_etwProvider = etwProvider;
 
 #if TARGET_WINDOWS
-#if (!ES_BUILD_STANDALONE && !ES_BUILD_PN)
+#if (!ES_BUILD_STANDALONE)
                 // API available on OS >= Win 8 and patched Win 7.
                 // Disable only for FrameworkEventSource to avoid recursion inside exception handling.
                 if (this.Name != "System.Diagnostics.Eventing.FrameworkEventSource" || Environment.IsWindows8OrAbove)
@@ -1831,11 +1806,8 @@ private static Guid GenerateGuidFromName(string name)
                     if (dataType.IsEnum())
                     {
                         dataType = Enum.GetUnderlyingType(dataType);
-#if ES_BUILD_PN
-                        int dataTypeSize = (int)dataType.TypeHandle.ToEETypePtr().ValueTypeSize;
-#else
+
                         int dataTypeSize = System.Runtime.InteropServices.Marshal.SizeOf(dataType);
-#endif
                         if (dataTypeSize < sizeof(int))
                             dataType = typeof(int);
                         goto Again;
@@ -2452,49 +2424,8 @@ protected override void OnControllerCommand(ControllerCommand command, IDictiona
         /// code:m_eventData for where we use this.
         /// </summary>
 
-        /*
-         EventMetadata was public in the separate System.Diagnostics.Tracing assembly(pre NS2.0),
-         now the move to CoreLib marked them as private.
-         While they are technically private (it's a contract used between the library and the ILC toolchain),
-         we need them to be rooted and exported from shared library for the system to work.
-         For now I'm simply marking them as public again.A cleaner solution might be to use.rd.xml to
-         root them and modify shared library definition to force export them.
-         */
-#if ES_BUILD_PN
-        public
-#else
-        internal
-#endif
-        partial struct EventMetadata
-        {
-#if ES_BUILD_PN
-            public EventMetadata(EventDescriptor descriptor,
-                EventTags tags,
-                bool enabledForAnyListener,
-                bool enabledForETW,
-                string name,
-                string message,
-                EventParameterType[] parameterTypes)
-            {
-                this.Descriptor = descriptor;
-                this.Tags = tags;
-                this.EnabledForAnyListener = enabledForAnyListener;
-                this.EnabledForETW = enabledForETW;
-#if FEATURE_PERFTRACING
-                this.EnabledForEventPipe = false;
-#endif
-                this.TriggersActivityTracking = 0;
-                this.Name = name;
-                this.Message = message;
-                this.Parameters = null!;
-                this.TraceLoggingEventTypes = null;
-                this.ActivityOptions = EventActivityOptions.None;
-                this.ParameterTypes = parameterTypes;
-                this.HasRelatedActivityID = false;
-                this.EventHandle = IntPtr.Zero;
-            }
-#endif
-
+        internal partial struct EventMetadata
+        {
             public EventDescriptor Descriptor;
             public IntPtr EventHandle;              // EventPipeEvent handle.
             public EventTags Tags;
@@ -2514,13 +2445,8 @@ public EventMetadata(EventDescriptor descriptor,
 
             public TraceLoggingEventTypes? TraceLoggingEventTypes;
             public EventActivityOptions ActivityOptions;
-
-#if ES_BUILD_PN
-            public EventParameterType[] ParameterTypes;
-#endif
         }
 
-#if !ES_BUILD_PN
         private static int GetParameterCount(EventMetadata eventData)
         {
             return eventData.Parameters.Length;
@@ -2532,101 +2458,6 @@ private static Type GetDataType(EventMetadata eventData, int parameterId)
         }
 
         private const bool m_EventSourcePreventRecursion = false;
-#else
-        private static int GetParameterCount(EventMetadata eventData)
-        {
-            int paramCount;
-            if (eventData.Parameters == null)
-            {
-                paramCount = eventData.ParameterTypes.Length;
-            }
-            else
-            {
-                paramCount = eventData.Parameters.Length;
-            }
-
-            return paramCount;
-        }
-
-        private static Type GetDataType(EventMetadata eventData, int parameterId)
-        {
-            Type dataType;
-            if (eventData.Parameters == null)
-            {
-                dataType = EventTypeToType(eventData.ParameterTypes[parameterId]);
-            }
-            else
-            {
-                dataType = eventData.Parameters[parameterId].ParameterType;
-            }
-
-            return dataType;
-        }
-
-        private static readonly bool m_EventSourcePreventRecursion = true;
-
-        public enum EventParameterType
-        {
-            Boolean,
-            Byte,
-            SByte,
-            Char,
-            Int16,
-            UInt16,
-            Int32,
-            UInt32,
-            Int64,
-            UInt64,
-            IntPtr,
-            Single,
-            Double,
-            Decimal,
-            Guid,
-            String
-        }
-
-        private static Type EventTypeToType(EventParameterType type)
-        {
-            switch (type)
-            {
-                case EventParameterType.Boolean:
-                    return typeof(bool);
-                case EventParameterType.Byte:
-                    return typeof(byte);
-                case EventParameterType.SByte:
-                    return typeof(sbyte);
-                case EventParameterType.Char:
-                    return typeof(char);
-                case EventParameterType.Int16:
-                    return typeof(short);
-                case EventParameterType.UInt16:
-                    return typeof(ushort);
-                case EventParameterType.Int32:
-                    return typeof(int);
-                case EventParameterType.UInt32:
-                    return typeof(uint);
-                case EventParameterType.Int64:
-                    return typeof(long);
-                case EventParameterType.UInt64:
-                    return typeof(ulong);
-                case EventParameterType.IntPtr:
-                    return typeof(IntPtr);
-                case EventParameterType.Single:
-                    return typeof(float);
-                case EventParameterType.Double:
-                    return typeof(double);
-                case EventParameterType.Decimal:
-                    return typeof(decimal);
-                case EventParameterType.Guid:
-                    return typeof(Guid);
-                case EventParameterType.String:
-                    return typeof(string);
-                default:
-                    // TODO: should I throw an exception here?
-                    return null!;
-            }
-        }
-#endif
 
         // This is the internal entry point that code:EventListeners call when wanting to send a command to a
         // eventSource. The logic is as follows
@@ -2915,28 +2746,11 @@ private void EnsureDescriptorsInitialized()
 #endif
             if (m_eventData == null)
             {
-                Guid eventSourceGuid = Guid.Empty;
-
-                // Try the GetMetadata provided by the ILTransform in ProjectN. The default sets all to null, and in that case we fall back
-                // to the reflection approach.
-                GetMetadata(out eventSourceGuid, out string? eventSourceName, out EventMetadata[]? eventData, out byte[]? manifest);
-
-                if (eventSourceGuid.Equals(Guid.Empty) || eventSourceName == null || eventData == null || manifest == null)
-                {
-                    // GetMetadata failed, so we have to set it via reflection.
-                    Debug.Assert(m_rawManifest == null);
+                // get the metadata via reflection.
+                Debug.Assert(m_rawManifest == null);
+                m_rawManifest = CreateManifestAndDescriptors(this.GetType(), Name, this);
+                Debug.Assert(m_eventData != null);
 
-                    m_rawManifest = CreateManifestAndDescriptors(this.GetType(), Name, this);
-                    Debug.Assert(m_eventData != null);
-                }
-                else
-                {
-                    // GetMetadata worked, so set the fields as appropriate.
-                    m_name = eventSourceName;
-                    m_guid = eventSourceGuid;
-                    m_eventData = eventData;
-                    m_rawManifest = manifest;
-                }
                 // TODO Enforce singleton pattern
                 Debug.Assert(EventListener.s_EventSources != null, "should be called within lock on EventListener.EventListenersLock which ensures s_EventSources to be initialized");
                 foreach (WeakReference<EventSource> eventSourceRef in EventListener.s_EventSources)
@@ -3058,11 +2872,9 @@ internal static Attribute GetCustomAttributeHelper(Type type, Type attributeType
         // When that is the case, we have the build the custom assemblies on a member by hand.
         internal static Attribute? GetCustomAttributeHelper(MemberInfo member, Type attributeType, EventManifestOptions flags = EventManifestOptions.None)
         {
-#if !ES_BUILD_PN
-            // On ProjectN, ReflectionOnly() always equals false.  AllowEventSourceOverride is an option that allows either Microsoft.Diagnostics.Tracing or
+            // AllowEventSourceOverride is an option that allows either Microsoft.Diagnostics.Tracing or
             // System.Diagnostics.Tracing EventSource to be considered valid.  This should not mattter anywhere but in Microsoft.Diagnostics.Tracing (nuget package).
             if (!member.Module.Assembly.ReflectionOnly() && (flags & EventManifestOptions.AllowEventSourceOverride) == 0)
-#endif // !ES_BUILD_PN
             {
                 // Let the runtime to the work for us, since we can execute code in this context.
                 Attribute? firstAttribute = null;
@@ -3074,7 +2886,7 @@ internal static Attribute GetCustomAttributeHelper(Type type, Type attributeType
                 return firstAttribute;
             }
 
-#if (!ES_BUILD_PCL && !ES_BUILD_PN)
+#if (!ES_BUILD_PCL)
             foreach (CustomAttributeData data in CustomAttributeData.GetCustomAttributes(member))
             {
                 if (AttributeTypeNamesMatch(attributeType, data.Constructor.ReflectedType!))
@@ -3116,7 +2928,7 @@ internal static Attribute GetCustomAttributeHelper(Type type, Type attributeType
             }
 
             return null;
-#else // ES_BUILD_PCL && ES_BUILD_PN
+#else // ES_BUILD_PCL
             // Don't use nameof here because the resource doesn't exist on some platforms, which results in a compilation error.
             throw new ArgumentException("EventSource_PCLPlatformNotSupportedReflection", "EventSource");
 #endif
@@ -3705,7 +3517,7 @@ private static void DebugCheckEvent(ref Dictionary<string, string>? eventsByName
         /// <returns>The literal value or -1 if the value could not be determined. </returns>
         private static int GetHelperCallFirstArg(MethodInfo method)
         {
-#if (!ES_BUILD_PCL && !ES_BUILD_PN)
+#if (!ES_BUILD_PCL)
             // Currently searches for the following pattern
             //
             // ...     // CAN ONLY BE THE INSTRUCTIONS BELOW
@@ -3834,7 +3646,7 @@ internal void ReportOutOfBandMessage(string msg)
         {
             try
             {
-#if (!ES_BUILD_PCL && !ES_BUILD_PN)
+#if (!ES_BUILD_PCL)
                 // send message to debugger without delay
                 System.Diagnostics.Debugger.Log(0, null, string.Format("EventSource Error: {0}{1}", msg, Environment.NewLine));
 #endif
diff --git a/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/StubEnvironment.cs b/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/StubEnvironment.cs
index 05a9f0eaa69e48..4e9415aa02e42d 100644
--- a/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/StubEnvironment.cs
+++ b/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/StubEnvironment.cs
@@ -3,7 +3,7 @@
 // See the LICENSE file in the project root for more information.
 
 using System;
-#if ES_BUILD_PCL || ES_BUILD_PN
+#if ES_BUILD_PCL
 using System.Collections.Generic;
 #endif
 using System.Reflection;
@@ -209,7 +209,7 @@ public enum TypeCode {
 #endif
     internal static class ReflectionExtensions
     {
-#if (!ES_BUILD_PCL && !ES_BUILD_PN)
+#if (!ES_BUILD_PCL)
 
         //
         // Type extension methods
@@ -239,11 +239,7 @@ internal static class ReflectionExtensions
         public static Assembly Assembly(this Type type) { return type.GetTypeInfo().Assembly; }
         public static IEnumerable<PropertyInfo> GetProperties(this Type type)
         {
-#if ES_BUILD_PN
-            return type.GetProperties();
-#else
             return type.GetRuntimeProperties();
-#endif
         }
         public static MethodInfo? GetGetMethod(this PropertyInfo propInfo) { return propInfo.GetMethod; }
         public static Type[] GetGenericArguments(this Type type) { return type.GenericTypeArguments; }
diff --git a/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/TraceLogging/PropertyValue.cs b/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/TraceLogging/PropertyValue.cs
index 645aab27244e4a..5db76aa09bcaa7 100644
--- a/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/TraceLogging/PropertyValue.cs
+++ b/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/TraceLogging/PropertyValue.cs
@@ -21,13 +21,7 @@ namespace System.Diagnostics.Tracing
     ///
     /// To get the value of a property quickly, use a delegate produced by <see cref="PropertyValue.GetPropertyGetter(PropertyInfo)"/>.
     /// </summary>
-#if ES_BUILD_PN
-    [CLSCompliant(false)]
-    public
-#else
-    internal
-#endif
-    readonly unsafe struct PropertyValue
+    internal readonly unsafe struct PropertyValue
     {
         /// <summary>
         /// Union of well-known value types, to avoid boxing those types.
@@ -208,12 +202,7 @@ private static Func<PropertyValue, PropertyValue> GetReferenceTypePropertyGetter
             return helper.GetPropertyGetter(property);
         }
 
-#if ES_BUILD_PN
-        public
-#else
-        private
-#endif
-        abstract class TypeHelper
+        private abstract class TypeHelper
         {
             public abstract Func<PropertyValue, PropertyValue> GetPropertyGetter(PropertyInfo property);
 
@@ -223,12 +212,7 @@ protected Delegate GetGetMethod(PropertyInfo property, Type propertyType)
             }
         }
 
-#if ES_BUILD_PN
-        public
-#else
-        private
-#endif
-        sealed class ReferenceTypeHelper<TContainer> : TypeHelper where TContainer : class?
+        private sealed class ReferenceTypeHelper<TContainer> : TypeHelper where TContainer : class?
         {
             public override Func<PropertyValue, PropertyValue> GetPropertyGetter(PropertyInfo property)
             {
diff --git a/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/TraceLogging/Statics.cs b/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/TraceLogging/Statics.cs
index 6d4dd919981b34..b7fa9d367aee23 100644
--- a/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/TraceLogging/Statics.cs
+++ b/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/TraceLogging/Statics.cs
@@ -360,7 +360,7 @@ public static IEnumerable<PropertyInfo> GetProperties(Type type)
         public static MethodInfo? GetDeclaredStaticMethod(Type declaringType, string name)
         {
             MethodInfo? result;
-#if (ES_BUILD_PCL || ES_BUILD_PN)
+#if (ES_BUILD_PCL)
             result = declaringType.GetTypeInfo().GetDeclaredMethod(name);
 #else
             result = declaringType.GetMethod(
@@ -375,7 +375,7 @@ public static bool HasCustomAttribute(
             Type attributeType)
         {
             bool result;
-#if (ES_BUILD_PCL || ES_BUILD_PN)
+#if (ES_BUILD_PCL)
             result = propInfo.IsDefined(attributeType);
 #else
             object[] attributes = propInfo.GetCustomAttributes(
@@ -390,7 +390,7 @@ public static bool HasCustomAttribute(
             where AttributeType : Attribute
         {
             AttributeType? result = null;
-#if (ES_BUILD_PCL || ES_BUILD_PN)
+#if (ES_BUILD_PCL)
             foreach (var attrib in propInfo.GetCustomAttributes<AttributeType>(false))
             {
                 result = attrib;
@@ -410,7 +410,7 @@ public static bool HasCustomAttribute(
             where AttributeType : Attribute
         {
             AttributeType? result = null;
-#if (ES_BUILD_PCL || ES_BUILD_PN)
+#if (ES_BUILD_PCL)
             foreach (var attrib in type.GetTypeInfo().GetCustomAttributes<AttributeType>(false))
             {
                 result = attrib;
@@ -441,7 +441,7 @@ public static Type[] GetGenericArguments(Type type)
             }
             else
             {
-#if (ES_BUILD_PCL || ES_BUILD_PN)
+#if (ES_BUILD_PCL)
                 IEnumerable<Type> ifaceTypes = type.GetTypeInfo().ImplementedInterfaces;
 #else
                 Type[] ifaceTypes = type.FindInterfaces(IsGenericMatch, typeof(IEnumerable<>));
@@ -449,7 +449,7 @@ public static Type[] GetGenericArguments(Type type)
 
                 foreach (Type ifaceType in ifaceTypes)
                 {
-#if (ES_BUILD_PCL || ES_BUILD_PN)
+#if (ES_BUILD_PCL)
                     if (!IsGenericMatch(ifaceType, typeof(IEnumerable<>)))
                     {
                         continue;
@@ -478,7 +478,7 @@ public static bool IsGenericMatch(Type type, object? openType)
         public static Delegate CreateDelegate(Type delegateType, MethodInfo methodInfo)
         {
             Delegate result;
-#if (ES_BUILD_PCL || ES_BUILD_PN)
+#if (ES_BUILD_PCL)
             result = methodInfo.CreateDelegate(
                 delegateType);
 #else
diff --git a/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/TraceLogging/TraceLoggingEventSource.cs b/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/TraceLogging/TraceLoggingEventSource.cs
index aa13daa55b4d1d..168e529daa84e8 100644
--- a/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/TraceLogging/TraceLoggingEventSource.cs
+++ b/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/TraceLogging/TraceLoggingEventSource.cs
@@ -441,7 +441,7 @@ private unsafe void WriteMultiMergeInner(
                 descriptors[1].SetMetadata(pMetadata1, nameInfo.nameMetadata.Length, 1);
                 descriptors[2].SetMetadata(pMetadata2, eventTypes.typeMetadata.Length, 1);
 
-#if (!ES_BUILD_PCL && !ES_BUILD_PN)
+#if (!ES_BUILD_PCL)
                 System.Runtime.CompilerServices.RuntimeHelpers.PrepareConstrainedRegions();
 #endif
                 try
@@ -625,7 +625,7 @@ private unsafe void WriteImpl(
                         descriptors[2].SetMetadata(pMetadata2, eventTypes.typeMetadata.Length, 1);
 #endif // FEATURE_MANAGED_ETW
 
-#if (!ES_BUILD_PCL && !ES_BUILD_PN)
+#if (!ES_BUILD_PCL)
                         System.Runtime.CompilerServices.RuntimeHelpers.PrepareConstrainedRegions();
 #endif
                         EventOpcode opcode = (EventOpcode)descriptor.Opcode;
@@ -732,7 +732,7 @@ private unsafe void WriteToAllListeners(string? eventName, ref EventDescriptor e
             DispatchToAllListeners(-1, eventCallbackArgs);
         }
 
-#if (!ES_BUILD_PCL && !ES_BUILD_PN)
+#if (!ES_BUILD_PCL)
         [System.Runtime.ConstrainedExecution.ReliabilityContract(
             System.Runtime.ConstrainedExecution.Consistency.WillNotCorruptState,
             System.Runtime.ConstrainedExecution.Cer.Success)]