Small fixes

Author: papafe

src/MongoDB.Bson/BsonExtensionMethods.cs

@@ -121,7 +121,7 @@ public static byte[] ToBson(
             {
                 using (var bsonWriter = new BsonBinaryWriter(memoryStream, writerSettings ?? BsonBinaryWriterSettings.Defaults))
                 {
-                    var context = BsonSerializationContext.CreateRoot(bsonWriter, configurator);
+                    var context = BsonSerializationContext.CreateRoot(bsonWriter, configurator).With(c => c.Domain = domain);
                     serializer.Serialize(context, args, obj);
                 }
                 return memoryStream.ToArray();

src/MongoDB.Driver/MongoCollectionSettings.cs

@@ -34,6 +34,7 @@ public class MongoCollectionSettings
         private Setting<ReadPreference> _readPreference;
         private Setting<WriteConcern> _writeConcern;
         private Setting<UTF8Encoding> _writeEncoding;
+        private Setting<IBsonSerializationDomain> _serializationDomain;
 
         // the following fields are set when Freeze is called
         private bool _isFrozen;
@@ -116,9 +117,26 @@ public ReadPreference ReadPreference
         /// <summary>
         /// Gets the serializer registry.
         /// </summary>
-        public IBsonSerializerRegistry SerializerRegistry
+        public IBsonSerializerRegistry SerializerRegistry =>
+            _serializationDomain.HasBeenSet
+                ? SerializationDomain.SerializerRegistry
+                : BsonSerializer.SerializerRegistry;
+
+        /// <summary>
+        /// //TODO
+        /// </summary>
+        public IBsonSerializationDomain SerializationDomain
         {
-            get { return BsonSerializer.SerializerRegistry; }
+            get => _serializationDomain.Value;
+            set
+            {
+                if (_isFrozen) { throw new InvalidOperationException("MongoCollectionSettings is frozen."); }
+                if (value == null)
+                {
+                    throw new ArgumentNullException("value");
+                }
+                _serializationDomain.Value = value;
+            }
         }
 
         /// <summary>

tests/MongoDB.Driver.Tests/Specifications/uuid/prose-tests/ImplicitEncodingTests.cs

@@ -82,6 +82,14 @@ public void Implicit_encoding_with_pyton_legacy_representation_should_work_as_ex
             binaryData.Bytes.Should().Equal(BsonUtils.ParseHexString("00112233445566778899aabbccddeeff"));
         }
 
+        public class Person
+        {
+            [BsonId]
+            public ObjectId Id { get; set; }
+            public string Name { get; set; }
+            public int Age { get; set; }
+        }
+
         [Fact]
         public void Implicit_encoding_with_standard_representation_should_work_as_expected()
         {