mongoDB 官方C#驱动 序列化数组但序列成System.Collections.Generic.List`1解决方法

   [Serializable]
    public class ActionClass
    {
        [BsonId(IdGenerator = typeof(StringObjectIdGenerator))]
        public string ID { get; set; }
        public string Content { get; set; }

        public string[] Tag { get; set; }
     }

        public static string Insert(ActionClass row)
        {
            SafeModeResult rtn = DB.GetCollection(TableName).Insert<ActionClass>(row);
            return row.ID;
        }