Custom mongodb serializer, able to wrap/unwrap string values to/from custom class instances, generic for the type of the (de)serialized custom class

StringToObjectSerializer.cs

namespace Huxley.MongoDb.Serialization {
  class StringToObjectSerializer<T> : SerializerBase<T> {
      private readonly Func<string, T> valueDeserializer;
      private readonly Func<T, string> valueSerializer;

      public StringToObjectSerializer(Func<string, T> valueDeserializer, Func<T, string> valueSerializer) {
          this.valueDeserializer = valueDeserializer;
          this.valueSerializer = valueSerializer;
      }

      public override T Deserialize(BsonDeserializationContext context, BsonDeserializationArgs args) {
          string value = context.Reader.ReadString();
          return valueDeserializer(value);
      }

      public override void Serialize(BsonSerializationContext context, BsonSerializationArgs args, T obj) {
          context.Writer.WriteString(valueSerializer(obj));
      }
  }
}

class MyClass {
  public string Value { get; }

  public MyClass(string value) {
    Value = value;
  }
}

// Usage:
class MyContainer {
  public MyClass MyProperty { get; private set; }
}

BsonClassMap.RegisterClassMap<MyContainer>(cm => {
  cm.MapField(x => x.MyProperty).SetSerializer(new StringToObjectSerializer<MyClass>(s => new MyClass(s), x => x.Value));
});