在MongoDB中序列化枚举的哈希集

我通过编写自定义序列化程序来修复它:(EngineType可以是泛型T)

 public class MyHashSetSerializer : SerializerBase<HashSet<EngineType>>
{
    private readonly IBsonSerializer _serializer =
        BsonSerializer.LookupSerializer(typeof(EngineType));

    public override void Serialize(BsonSerializationContext context, BsonSerializationArgs args, HashSet<EngineType> value)
    {
        var set = (HashSet<EngineType>)value;

        context.Writer.WriteStartDocument();           
        int i = 0;
        foreach (var element in set)
        {

            context.Writer.WriteName($"[{i}]");
            context.Writer.WriteString(element.ToString());
        }
        context.Writer.WriteEndDocument();
    }

    public override HashSet<EngineType> Deserialize(BsonDeserializationContext context, BsonDeserializationArgs args)
    {
        var set = new HashSet<EngineType>();

        context.Reader.ReadStartDocument();
        while (context.Reader.ReadBsonType() != 0)
        {
            context.Reader.SkipName();
            var element =
                (EngineType)_serializer.Deserialize(context, args);              
            set.Add(element);
        }
        context.Reader.ReadEndDocument();

        return set;
    }
}

然后我注册类映射如下:

BsonClassMap.RegisterClassMap<EnginesPerFile>(cm =>
            {
                cm.AutoMap();
                cm.MapIdField(c => c.FileId);
                cm.MapMember(c => c.Engines).SetSerializer(new MyHashSetSerializer());
            });