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Виталий Шебаниц
Asked:2020-05-27 21:59:25 +0800 CST2020-05-27 21:59:25 +0800 CST

自动映射器中的反序列化

  • 772

有一个代码：

        CreateMap<Mnemoelement, MnemoelementDTO>()
            .ForMember(nameof(MnemoelementDTO.Settings), opt => opt.MapFrom(me => JsonConvert.DeserializeObject<__type__>(me.Settings)));

__type__ - 因属性而异me.Type( string)

例如，如果me.Type == "LINE"，则反序列化为类型LineSettings，如果me.Type == "CIRCLE"，则反序列化为类型CircleSettings。

MapFrom如果您以某种方式将其插入其中，switch它会有所帮助，但是如何？

如何实施？

c#

1 个回答

  1. Best Answer

    要在映射时执行一些自定义逻辑，您可以实现自己的，ResolverMember例如，像这样：

        public class ResolverMnemoelement : IValueResolver<Mnemoelement, MnemoelementDTO, ISettings>
    {

        ISettings IValueResolver<Mnemoelement, MnemoelementDTO, ISettings>.Resolve(Mnemoelement source, MnemoelementDTO destination, ISettings destMember, ResolutionContext context)
        {
            ISettings result = null;
            switch (source.Type)
            {
                case "LINE":
                    {
                        result = JsonConvert.DeserializeObject<LineSettings>(source.Settings);
                        break;
                    }
                case "CIRCLE":
                    {
                        result = JsonConvert.DeserializeObject<CircleSettings>(source.Settings);
                        break;
                    }
            }
            return result;
        }
    }

    然后像这样使用：

          CreateMap<Mnemoelement, MnemoelementDTO>()
            .ForMember(meDTO => meDTO.LinkType, opt => opt.MapFrom(me => Enum.Parse(typeof(EMnemoelementLinkType), me.LinkType)))
            .ForMember(meDTO => meDTO.Type, opt => opt.MapFrom(me => Enum.Parse(typeof(EMnemoelementType), me.Type)))
            .ForMember(meDTO => meDTO.Settings, opt => opt.MapFrom(new ResolverMnemoelement()));

    这将映射模型：

    /// <summary>
/// Элемент на мнемосхеме
/// </summary>
[Table(name: "mnemoelements", Schema = "public")]
public class Mnemoelement : IEntitySingleId<int>
{
    /// <summary>
    /// Идентификатор
    /// </summary>
    [Key]
    [Column("id")]
    public int Id { get; set; }
    /// <summary>
    /// Тип ссылки
    /// MNEMO | GROUP
    /// </summary>
    [Column("link_type")]
    [MaxLength(15)]
    [Required]
    public string LinkType { get; set; }
    /// <summary>
    /// Идентификатор для LinkType
    /// </summary>
    [Column("identifier")]
    [MaxLength(50)]
    [Required]
    public string Identifier { get; set; }
    /// <summary>
    /// Тип элемента
    /// "LINE" | "CIRCLE" | "ICON" | "TEXT" | "LINK"
    /// </summary>
    [Column("type")]
    [MaxLength(50)]
    [Required]
    public string Type { get; set; }
    /// <summary>
    /// Настройки для конкретного элемента
    /// </summary>
    [Column("settings")]
    [MaxLength(50)]
    [Required]
    public string Settings { get; set; }
}

    和

    public class MnemoelementDTO
{
    /// <summary>
    /// Идентификатор
    /// </summary>
    [Display(Name = "Iдентифікатор", ShortName = "#")]
    public int Id { get; set; }
    /// <summary>
    /// Тип ссылки
    /// MNEMO | GROUP
    /// </summary>
    [Display(Name = "Тип посилання")]
    public EMnemoelementLinkType LinkType { get; set; }
    /// <summary>
    /// Идентификатор для LinkType
    /// </summary>
    [Display(Name = "Iдентифікатор")]
    public string Identifier { get; set; }
    /// <summary>
    /// Тип элемента
    /// "LINE" | "CIRCLE" | "ICON" | "TEXT" | "LINK"
    /// </summary>
    [Display(Name = "Тип елементу")]
    public EMnemoelementType Type { get; set; }
    /// <summary>
    /// Настройки для конкретного элемента
    /// </summary>
    [Display(Name = "Налаштування")]
    public ISettings Settings { get; set; }
}

    在这种情况下，模型ISettings可以有任何可用的设置模型

    public interface ISettings
{

}

public class LineSettings : ISettings
{
    public Tuple<Point, Point> Position { get; set; }
    public string Color { get; set; } = "#ffffff";
    public double Size { get; set; } = 2.0;

    public class Point
    {
        double X { get; set; }
        double Y { get; set; }
        public Point(int x, int y)
        {
            X = x;
            Y = y;
        }
    }
}

public class CircleSettings : ISettings
{
    public Point Position { get; set; }
    public double Radius { get; set; }
    public string Color { get; set; } = "#ffffff";
    public double BorderSize { get; set; } = 1.0;
    public string BorderColor{ get; set; } = "#ffffff";
    public double Size { get; set; } = 2.0;

    public class Point
    {
        double X { get; set; }
        double Y { get; set; }
        public Point(int x, int y)
        {
            X = x;
            Y = y;
        }
    }
}

    ps 解决方法在automapper文档中找到

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