MongoDB.Bson.BsonSerializationException: Maximum serialization depth exceeded (does the object being serialized have a circular reference?).
序列化的时候报错，检查代码没有存在可能循环引用的地方。最后发现是用了没有注册的变量“int3”。解决方式：在Mongo初始化注册一下RegisterStruct<int3>();