fix coreclr isabstract lookup

Author: Mpdreamz

src/Tests/CodeStandards/NamingConventions.doc.cs

@@ -35,7 +35,7 @@ [U] public void ClassNameContainsBaseShouldBeAbstract()
 			var baseClassesNotAbstract = typeof(IRequest).Assembly().GetTypes()
 				.Where(t => t.IsClass() && !exceptions.Contains(t))
 				.Where(t => t.Name.Split('`')[0].EndsWith("Base"))
-				.Where(t => !t.IsAbstract)
+				.Where(t => !t.IsAbstractClass())
 				.Select(t => t.Name.Split('`')[0])
 				.ToList();
 

src/Tests/Framework/Extensions/TypeExtensions.cs

@@ -30,6 +30,15 @@ internal static bool IsGeneric(this Type type)
 #endif
 		}
 
+		internal static bool IsAbstractClass(this Type type)
+		{
+#if DOTNETCORE
+			return type.GetTypeInfo().IsAbstract;
+#else
+			return type.IsAbstract;
+#endif
+		}
+
 		internal static bool IsValue(this Type type)
 		{
 #if DOTNETCORE