Fix reflection abstraction inconsistency for corefx.

Author: yfakariya

src/MsgPack/ReflectionAbstractions.cs

@@ -208,7 +208,7 @@ public static MethodInfo GetRuntimeMethod( this Type source, string name, Type[]
 			return
 				source.GetRuntimeMethods()
 					.SingleOrDefault(
-						m => m.Name == name && m.GetParameters().Select( p => p.ParameterType ).SequenceEqual( parameters )
+						m => m.IsPublic && m.Name == name && m.GetParameters().Select( p => p.ParameterType ).SequenceEqual( parameters )
 					);
 		}
 
@@ -218,7 +218,7 @@ public static MethodInfo GetRuntimeMethod( this Type source, string name, Type[]
 			return
 				source.GetMethod(
 					name,
-					BindingFlags.Instance | BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic,
+					BindingFlags.Instance | BindingFlags.Static | BindingFlags.Public,
 					null,
 					parameters,
 					null
@@ -280,7 +280,7 @@ public static Delegate CreateDelegate( this MethodInfo source, Type delegateType
 #if NETSTANDARD1_1 || NETSTANDARD1_3
 		public static MethodInfo GetMethod( this Type source, string name )
 		{
-			return source.GetRuntimeMethods().SingleOrDefault( m => m.Name == name && m.DeclaringType == source );
+			return source.GetRuntimeMethods().SingleOrDefault( m => m.IsPublic && m.Name == name && m.DeclaringType == source );
 		}
 
 		public static MethodInfo GetMethod( this Type source, string name, Type[] parameters )

src/MsgPack/Serialization/AbstractSerializers/SerializerBuilder`2.Collection.cs

@@ -1,4 +1,4 @@
-#region -- License Terms --
+#region -- License Terms --
 //
 // MessagePack for CLI
 //
@@ -526,7 +526,7 @@ protected internal TConstruct EmitUnpackToInitialization( TContext context )
 					context.GetDeclaredField( FieldName.UnpackTo ),
 					this.EmitNewPrivateMethodDelegateExpression(
 						context,
-						this.BaseClass.GetRuntimeMethod( MethodName.UnpackToCore, parameterTypes )
+						this.BaseClass.GetRuntimeMethods().Single( m => m.Name == MethodName.UnpackToCore && m.GetParameterTypes().SequenceEqual( parameterTypes ) )
 					)
 				);
 
@@ -542,7 +542,7 @@ protected internal TConstruct EmitUnpackToInitialization( TContext context )
 						context.GetDeclaredField( FieldName.UnpackTo + "Async" ),
 						this.EmitNewPrivateMethodDelegateExpression(
 							context,
-							this.BaseClass.GetRuntimeMethod( MethodName.UnpackToAsyncCore, asyncParameterTypes )
+							this.BaseClass.GetRuntimeMethods().Single( m => m.Name == MethodName.UnpackToAsyncCore && m.GetParameterTypes().SequenceEqual( asyncParameterTypes ) )
 						)
 					);
 

src/MsgPack/Serialization/MessagePackSerializer.Factories.cs

@@ -33,6 +33,10 @@
 using System;
 using System.IO;
 using System.Globalization;
+#if AOT
+using System.Linq;
+using System.Reflection;
+#endif // AOT
 using System.Runtime.Serialization;
 
 using MsgPack.Serialization.DefaultSerializers;
@@ -537,9 +541,10 @@ public static MessagePackSerializer Get( Type targetType, SerializationContext c
 
 #if AOT
 		private static readonly System.Reflection.MethodInfo CreateInternal_2 = 
-			typeof( MessagePackSerializer ).GetRuntimeMethod( 
-				"CreateInternal", 
-				new []{ typeof( SerializationContext ), typeof( PolymorphismSchema ) }
+			typeof( MessagePackSerializer ).GetRuntimeMethods()
+			.Single( m =>
+				m.Name == "CreateInternal"
+				&& m.GetParameterTypes().SequenceEqual( new []{ typeof( SerializationContext ), typeof( PolymorphismSchema ) } )
 			);
 
 		internal static MessagePackSerializer CreateInternal( SerializationContext context, Type targetType, PolymorphismSchema schema )