NH-3807 - Other misc reflection changes for CoreClr.

Author: ngbrown

src/NHibernate/Bytecode/EmitUtil.cs

@@ -205,8 +205,11 @@ public static void EmitLoadMethodInfo(ILGenerator il, MethodInfo methodInfo)
 		public static void EmitCreateDelegateInstance(ILGenerator il, System.Type delegateType, MethodInfo methodInfo)
 		{
 			MethodInfo createDelegate = typeof(Delegate).GetMethod(
-				"CreateDelegate", BindingFlags.Static | BindingFlags.Public | BindingFlags.ExactBinding, null,
-				new System.Type[] {typeof(System.Type), typeof(MethodInfo)}, null);
+				"CreateDelegate", BindingFlags.Static | BindingFlags.Public
+#if !NETSTANDARD
+				| BindingFlags.ExactBinding
+#endif
+				, null, new System.Type[] {typeof(System.Type), typeof(MethodInfo)}, null);
 
 			EmitLoadType(il, delegateType);
 			EmitLoadMethodInfo(il, methodInfo);

src/NHibernate/Cfg/Environment.cs

@@ -51,7 +51,7 @@ public static string Version
 			{
 				if (cachedVersion == null)
 				{
-					Assembly thisAssembly = Assembly.GetExecutingAssembly();
+					Assembly thisAssembly = typeof(Environment).GetTypeInfo().Assembly;
 					var attrs =
 						thisAssembly.GetCustomAttributes<AssemblyInformationalVersionAttribute>().ToArray();
 

src/NHibernate/Proxy/DynamicProxy/ProxyFactory.cs

@@ -157,7 +157,12 @@ private System.Type CreateUncachedProxyType(System.Type baseType, System.Type[]
 			// Make the proxy serializable
 			AddSerializationSupport(baseType, baseInterfaces, typeBuilder, interceptorField, defaultConstructor);
 #endif
+
+#if FEATURE_LEGACY_REFLECTION_API
 			System.Type proxyType = typeBuilder.CreateType();
+#else
+			System.Type proxyType = typeBuilder.CreateTypeInfo().AsType();
+#endif
 
 			ProxyAssemblyBuilder.Save(assemblyBuilder);
 			return proxyType;

src/NHibernate/Util/ReflectHelper.cs

@@ -9,6 +9,10 @@
 using NHibernate.Type;
 using NHibernate.Engine;
 
+#if NETSTANDARD
+using Microsoft.Extensions.DependencyModel;
+#endif
+
 namespace NHibernate.Util
 {
 	/// <summary>
@@ -219,7 +223,11 @@ public static System.Type ClassForFullNameOrNull(string classFullName)
 			{
 				if (!string.IsNullOrEmpty(classFullName))
 				{
+#if NETSTANDARD
+					Assembly[] ass = DependencyContext.Default.RuntimeLibraries.SelectMany(l => l.Assemblies).Select(x => Assembly.Load(x.Name)).ToArray();
+#else
 					Assembly[] ass = AppDomain.CurrentDomain.GetAssemblies();
+#endif
 					foreach (Assembly a in ass)
 					{
 						result = a.GetType(classFullName, false, false);