zoukankan      html  css  js  c++  java
  • 继承映射

    Mapping Inheritance

    AutoMapper 1.1 had a method called .Include<> when creating your maps which allowed AutoMapper to automatically select the most derived mapping for a class.

    Take:

        public class Order { }
        public class OnlineOrder : Order { }
        public class MailOrder : Order { }
    
        public class OrderDto { }
        public class OnlineOrderDto : OrderDto { }
        public class MailOrderDto : OrderDto { }
    
        Mapper.Initialize(cfg => {
        cfg.CreateMap<Order, OrderDto>()
              .Include<OnlineOrder, OnlineOrderDto>()
              .Include<MailOrder, MailOrderDto>();
        cfg.CreateMap<OnlineOrder, OnlineOrderDto>();
        cfg.CreateMap<MailOrder, MailOrderDto>();
        });
    
        // Perform Mapping
        var order = new OnlineOrder();
        var mapped = Mapper.Map(order, order.GetType(), typeof(OrderDto));
        Assert.IsType<OnlineOrderDto>(mapped);
    

    You will notice that because the mapped object is a OnlineOrder, AutoMapper has seen you have a more specific mapping for OnlineOrder than OrderDto, and automatically chosen that.

    Specifying inheritance in derived classes

    Instead of configuring inheritance from the base class, you can specify inheritance from the derived classes:

    Mapper.Initialize(cfg => {
    cfg.CreateMap<Order, OrderDto>()
        .ForMember(o => o.Id, m => m.MapFrom(s => s.OrderId));
    cfg.CreateMap<OnlineOrder, OnlineOrderDto>()
        .IncludeBase<Order, OrderDto>();
    cfg.CreateMap<MailOrder, MailOrderDto>()
        .IncludeBase<Order, OrderDto>();
    });
    

    Inheritance Mapping Priorities

    This introduces additional complexity because there are multiple ways a property can be mapped. The priority of these sources are as follows

    • Explicit Mapping (using .MapFrom())
    • Inherited Explicit Mapping
    • Ignore Property Mapping
    • Convention Mapping (Properties that are matched via convention)

    To demonstrate this, lets modify our classes shown above

        //Domain Objects
        public class Order { }
        public class OnlineOrder : Order 
        { 
            public string Referrer { get; set; }
        }
        public class MailOrder : Order { }
    
        //Dtos
        public class OrderDto
        {
            public string Referrer { get; set; }
        }
    
        //Mappings
        Mapper.Initialize(cfg => {
        cfg.CreateMap<Order, OrderDto>()
              .Include<OnlineOrder, OrderDto>()
              .Include<MailOrder, OrderDto>()
              .ForMember(o=>o.Referrer, m=>m.Ignore());
        cfg.CreateMap<OnlineOrder, OrderDto>();
        cfg.CreateMap<MailOrder, OrderDto>();
        });
    
        // Perform Mapping
        var order = new OnlineOrder { Referrer = "google" };
        var mapped = Mapper.Map(order, order.GetType(), typeof(OrderDto));
        Assert.Equals("google", mapped.Referrer);
    

    Notice that in our mapping configuration, we have ignored Referrer (because it doesn't exist in the order base class), but convention has a higher priority than Ignored properties in the base class mappings, so the property still gets mapped.

    Overall this feature should make using AutoMapper with classes that leverage inheritance feel more natural.

  • 相关阅读:
    win7 iis7 配置如何让局域网内其它用户访问
    WPF依赖项属性详解一
    项目管理SOW(工作说明书)
    新建silverlight 4 应用程序时出错:需要更新 microsoft visual studio 以面向 silverlight4
    WPF触发器(trigger)详解
    public,private,protected,internal作用
    抽象类,密封类及类成员
    java8 lanbda表达式对list对象去重,对象属性转成string
    window10环境ngnix配置https记录
    java动态调用webservice(.asmx?wsdl)
  • 原文地址:https://www.cnblogs.com/Leman/p/5774354.html
Copyright © 2011-2022 走看看