将一个表实体自动映射到两个 DTO 子类

Question

我有一张桌子留言：

CREATE TABLE [Communication].[Message]
(
    [MessageID] BIGINT NOT NULL PRIMARY KEY IDENTITY, 
    [MessageChannelID] INT NOT NULL,
    [MessageStatusID] INT NOT NULL, 
    [Sender] NVARCHAR(100) NOT NULL, 
    [SenderDisplayName] NVARCHAR(100) NULL, 
    [Receiver] NVARCHAR(100) NOT NULL, 
    [Content] NVARCHAR(MAX) NULL, 
    [EmailUseSSL] BIT NOT NULL DEFAULT 0, 
    [EmailReceiverCC] NVARCHAR(100) NULL, 
    [EmailReceiverBCC] NVARCHAR(100) NULL, 
    [EmailSenderReplyTo] NVARCHAR(100) NULL, 
    [EmailSubject] NVARCHAR(300) NULL, 
    [SMSGUID] NVARCHAR(100) NULL, 
    [CreatedAt] DATETIME NOT NULL DEFAULT getDate(), 
    [Note] NVARCHAR(300) NULL, 
    CONSTRAINT [FK_Message_MessageStatus] FOREIGN KEY ([MessageStatusID]) REFERENCES [Communication].[MessageStatus]([MessageStatusID]), 
    CONSTRAINT [FK_Message_MessageChannel] FOREIGN KEY ([MessageChannelID]) REFERENCES [Communication].[MessageChannel]([MessageChannelID])
)

我有 DTO 课程：

public class MessageDTO
{
    public int MessageID { get; set; }
    public string Sender { get; set; }
    public string SenderDisplayName { get; set; }
    public string Receiver { get; set; }
    public string Content { get; set; }
    public DateTime CreatedAt { get; internal set; }
    public string Note { get; set; }
    public MessageStatus Status { get; set; }
    public MessageChannel Channel { get; internal set; }
}

public class EmailMessageDTO: MessageDTO
{
    public bool EmailUseSSL { get; set; }
    public string EmailReceiverCC { get; set; }
    public string EmailReceiverBCC { get; set; }
    public string EmailSenderReplyTo { get; set; }
    public string EmailSubject { get; set; }
}

public class SMSMessageDTO: MessageDTO
{
    public string SMSGUID { get; set; }
}

消息类型可以从 MessageChannelID（Email、SMS）解析。是否可以使用 Automapper 获取具有特定状态的所有消息，以便将某些消息映射到 EmailMessageDTO，将其他消息映射到 SMSMessageDTO？我想编写一个 GetMessages 方法，根据消息类型返回所有​​消息，对象为 EmailMessageDTO 或 SMSMessageDTO。

Answer 1

在查理的评论之后，我想出了这个：

x.CreateMap<Message, MessageDTO>()
                    .ForMember(m => m.Status, opts => opts.MapFrom(src => src.MessageStatusID))
                    .ForMember(m => m.Channel, opts => opts.MapFrom(src => src.MessageChannelID))
                    .ConstructUsing(m =>
                    {
                        if (m.MessageChannelID == (int)Data.MessageChannel.Email)
                            return new EmailMessageDTO
                            {
                                EmailReceiverBCC = m.EmailReceiverBCC,
                                EmailReceiverCC = m.EmailReceiverCC,
                                EmailSenderReplyTo = m.EmailSenderReplyTo,
                                EmailSubject = m.EmailSubject,
                                EmailUseSSL = m.EmailUseSSL
                            };
                        else return new SMSMessageDTO
                        {
                            SMSGUID = m.SMSGUID
                        };
                    });