Implement HasSameMetadataDefinitionAs() on CoreCLR

src/mscorlib/shared/System/Reflection/MemberInfo.cs

@@ -30,6 +30,8 @@ public virtual Module Module
             }
         }
 
+        public virtual bool HasSameMetadataDefinitionAs(MemberInfo other) { throw NotImplemented.ByDesign; }
+
         public abstract bool IsDefined(Type attributeType, bool inherit);
         public abstract object[] GetCustomAttributes(bool inherit);
         public abstract object[] GetCustomAttributes(Type attributeType, bool inherit);

src/mscorlib/src/System/Reflection/MemberInfo.Internal.cs

@@ -7,5 +7,23 @@ namespace System.Reflection
     public abstract partial class MemberInfo
     {
         internal virtual bool CacheEquals(object o) { throw new NotImplementedException(); }
+
+        internal bool HasSameMetadataDefinitionAsCore<TOther>(MemberInfo other) where TOther : MemberInfo
+        {
+            if (other == null)
+                throw new ArgumentNullException(nameof(other));
+
+            // Ensure that "other" is a runtime-implemented MemberInfo. Do this check before calling any methods on it!
+            if (!(other is TOther)) 
+                return false;
+
+            if (MetadataToken != other.MetadataToken)
+                return false;
+
+            if (!(Module.Equals(other.Module)))
+                return false;
+
+            return true;
+        }
     }
 }

src/mscorlib/src/System/Reflection/RuntimeConstructorInfo.cs

@@ -218,6 +218,8 @@ public override Type DeclaringType
             }
         }
 
+        public sealed override bool HasSameMetadataDefinitionAs(MemberInfo other) => HasSameMetadataDefinitionAsCore<RuntimeConstructorInfo>(other);
+
         public override Type ReflectedType
         {
             get

src/mscorlib/src/System/Reflection/RuntimeEventInfo.cs

@@ -135,6 +135,7 @@ public override String Name
             }
         }
         public override Type DeclaringType { get { return m_declaringType; } }
+        public sealed override bool HasSameMetadataDefinitionAs(MemberInfo other) => HasSameMetadataDefinitionAsCore<RuntimeEventInfo>(other);
         public override Type ReflectedType
         {
             get

src/mscorlib/src/System/Reflection/RuntimeFieldInfo.cs

@@ -68,6 +68,8 @@ public override Type DeclaringType
             }
         }
 
+        public sealed override bool HasSameMetadataDefinitionAs(MemberInfo other) => HasSameMetadataDefinitionAsCore<RuntimeFieldInfo>(other);
+
         public override Module Module { get { return GetRuntimeModule(); } }
         #endregion
 

src/mscorlib/src/System/Reflection/RuntimeMethodInfo.cs

@@ -335,6 +335,8 @@ public override Type DeclaringType
             }
         }
 
+        public sealed override bool HasSameMetadataDefinitionAs(MemberInfo other) => HasSameMetadataDefinitionAsCore<RuntimeMethodInfo>(other);
+
         public override Type ReflectedType
         {
             get

src/mscorlib/src/System/Reflection/RuntimePropertyInfo.cs

@@ -207,6 +207,8 @@ public override Type DeclaringType
             }
         }
 
+        public sealed override bool HasSameMetadataDefinitionAs(MemberInfo other) => HasSameMetadataDefinitionAsCore<RuntimePropertyInfo>(other);
+
         public override Type ReflectedType
         {
             get

src/mscorlib/src/System/RtType.cs

@@ -3789,6 +3789,8 @@ public override Type[] GetGenericParameterConstraints()
         #endregion
 
         #region Misc
+        public sealed override bool HasSameMetadataDefinitionAs(MemberInfo other) => HasSameMetadataDefinitionAsCore<RuntimeType>(other);
+
         public override bool IsTypeDefinition
         {
             get { return RuntimeTypeHandle.IsTypeDefinition(this); }