如何在集合中正确使用 ForMember？

Question

我有我的来源class作为

public class SourceEmployee
    {
        public int EmployeeID { get; set; }
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public List<ResidentialAddress> EmployeeResidences { get; set; }
    }

住宅地址如下

public class ResidentialAddress
    {
        public string State { get; set; }
        public string City { get; set; }
        public int ZipCode { get; set; }

    }

目的地 class如下

public class DestinationEmployee
{
        public int EmployeeID { get; set; }
        public string FullName { get; set; }       
        public List<ResidentialAddress1> Address { get; set; }

}

public class ResidentialAddress1
{
   public string FullAddress { get; set; }
}

如何为 State + City + ZipCode 的 FullAddress 执行 ForMember？

我迷路了

Mapper.CreateMap<SourceEmployee, DestinationEmployee>();

Mapper.CreateMap<SourceEmployee, DestinationEmployee>().
ForMember(f => f.FullName, f => f.MapFrom(a => string.Concat(a.FirstName, " ", a.LastName)))
.ForMember(x => x.EmployeeResidences1, x => x.MapFrom(y => string.Concat(y.EmployeeResidences.m, " ", y.LastName)));

Answer 1

嗯，您可以使用 LINQ 让 AutoMapper 知道如何将 3 个属性映射到一个属性，您不应该真正使用 Mapper.CreateMap()，因为它 已弃用 并且 5.0 版将不再支持 - 请改用 Mapper.Initialize()。

让我们看一下这个例子：

            Mapper.Initialize(cfg =>
            {
                cfg.CreateMap<SourceEmployee, DestinationEmployee>();

                cfg.CreateMap<SourceEmployee, DestinationEmployee>()
                .ForMember(f => f.FullName, f => f.MapFrom(a => string.Concat(a.FirstName, " ", a.LastName)))
                .ForMember(
                    x => x.Address,
                    x => x.MapFrom(
                        y => y.EmployeeResidences.Select(
                            r => new ResidentialAddress1()
                            {
                                FullAddress = String.Concat(
                                    r.State, "  ", r.City, "  ", r.ZipCode)
                            }).ToList()));
            });

            SourceEmployee emp = new SourceEmployee()
            {
                EmployeeID = 1,
                FirstName = "Alex",
                LastName = "Green",
                EmployeeResidences = new List<ResidentialAddress>()
                {
                    new ResidentialAddress() { State = "abc", City = "def", ZipCode = 110 },
                    new ResidentialAddress() { State = "foo", City = "qwe", ZipCode = 220 },
                    new ResidentialAddress() { State = "bar", City = "ert", ZipCode = 330 },
                }
            };

            var sourceEmp = Mapper.Map<SourceEmployee, DestinationEmployee>(emp);

            Console.WriteLine(sourceEmp.Address.Count);    
            Console.WriteLine(sourceEmp.Address[1].FullAddress);

输出：

3
foo qwe 220

Answer 2

您的 ResidentialAddress -> ResidentialAddress1 转换应该有一个单独的地图配置文件。当您的父对象将使用自动映射器进行转换时，所有子对象将使用定义的映射配置文件进行转换：

Mapper.CreateMap<SourceEmployee, DestinationEmployee>()
    .ForMember(f => f.FullName, f => f.MapFrom(a => string.Concat(a.FirstName, " ", a.LastName)))
    .ForMember(x => x.Address, x => x.MapFrom(y => y.EmployeeResidences)));

Mapper.CreateMap<ResidentialAddress, ResidentialAddress1>
    .ForMember(x => x.FullAddress, map=>map.From(from => string.Format("{0} {1} {2}", from.State, from.City, from.ZipCode);

这样，如果在代码中您必须在多个地方将 ResidentialAddress 转换为 ResidentialAddress1，则无需添加任何代码，只需使用 Mapper.Map<>.

我还建议您切换到配置文件，而不是内联定义映射器配置：https://github.com/AutoMapper/AutoMapper/wiki/Configuration

如何在集合中正确使用 ForMember？

How to use ForMember properly inside a collection?

c#

automapper