AutoMapper需要4秒來映射19個對象

我一直在這一段時間停留，我很難過。 Automapper需要4秒鐘來映射19個對象。操作應該在我的機器上花費毫秒或納秒（24gb ram，3.6Ghz i7）。AutoMapper需要4秒來映射19個對象

這是映射調用。

var messageDtos = AutoMapperConfig.Mapper.Map<List<Message>, List<MessageDTO>>(messages);

這是我Automapper配置

public static class AutoMapperConfig 
{ 
    public static IMapper Mapper; 
    public static void Configure() 
    { 
     MapperConfiguration config = new MapperConfiguration(cfg => 
     { 
      cfg.CreateMap<User, UserDTO>(); 
      cfg.CreateMap<UserDTO, User>(); 
      cfg.CreateMap<ConversationUser, ConversationUserDTO>(); 
      cfg.CreateMap<ConversationUserDTO, ConversationUser>(); 
      cfg.CreateMap<Conversation, ConversationDTO>(); 
      cfg.CreateMap<ConversationDTO, Conversation>() 
      .ForMember(dest => dest.ConversationUsers, opt => opt.MapFrom(src => src.ConversationUsers)); 

      cfg.CreateMap<Message, MessageDTO>(); 
      cfg.CreateMap<MessageDTO, Message>(); 

     }); 

     Mapper = config.CreateMapper(); 

    } 
}

下面是相關的對象。他們沒有什麼瘋狂的。

public class Message 
{ 
    public int MessageId { get; set; } 
    public virtual Conversation Conversation { get; set; } 
    public virtual User User { get; set; } 
    public string Text { get; set; } 
    public DateTime CreateDate { get; set; } 
    public virtual ICollection<MediaMessage> MediaMessages { get; set; } 
    public virtual ICollection<ReadReceipt> ReadReceipts { get; set; } 

    public Message() 
    { 
     CreateDate = DateTime.Now; 
    } 
} 

public class MessageDTO 
{ 
    public int MessageId { get; set; } 
    public virtual ConversationDTO Conversation { get; set; } 
    public virtual UserDTO User { get; set; } 
    public string Text { get; set; } 
    public DateTime CreateDate { get; set; } 
    public virtual ICollection<MediaMessage> MediaMessages { get; set; } 
    public virtual ICollection<ReadReceipt> ReadReceipts { get; set; } 
    public string Type { get; set; } 
    public string TransferGuid { get; set; } 
} 

public class ConversationDTO 
{ 
    public int ConversationId { get; set; } 
    public virtual UserDTO Owner { get; set; } 
    public virtual DateTime CreateDate { get; set; } 
    public virtual ICollection<ConversationUserDTO> ConversationUsers { get; set; } 
    public virtual Image Image { get; set; } 
    public virtual Message RecentMessage { get; set; } 
} 

public class UserDTO 
{ 
    public int UserId { get; set; } 
    public string Name { get; set; } 
    public DateTime CreateDate { get; set; } 
    public virtual PhoneNumber PhoneNumber { get; set; } 
    public virtual string TwitterHandel { get; set; } 
    public virtual Image Image { get; set; } 
}

這裏是點跟蹤的屏幕截圖顯示Automapper多長時間服用，不知道它有多大的洞察力提供了，我剛安裝dotrace昨日摸不着頭腦。