自動映射器將對象映射到具有第一個對象的嵌套列表的對象

Question

我正在上課：

public class Kempe
{
   public string Name {get; set;}
   public DateTime DateTaken {get; set;}
   public decimal Score {get; set;}
}

我想使用自動映射器將其映射到：

public class KempeCollector
{
   public string Name {get; set;}
   public List<KempeList> Collection {get; set;}
}

public class KempeList 
{
   public DateTime DateTaken {get; set;}
   public decimal Score {get; set;}
}

我該如何映射？ 我需要自定義解析器嗎？

Answer 1

假設您將擁有需要映射到KempeCollector的Kempe對象列表，則可以使用以下方法進行操作：

    Mapper.Initialize(cfg =>
    {
        cfg.CreateMap<Kempe, KempeList>();
        cfg.CreateMap<List<Kempe>, KempeCollector>().ConvertUsing((kempeList, kempeCollector) =>
        {
            kempeCollector = new KempeCollector
            {
                Name = kempeList[0].Name,
                Collection = new List<KempeList>()
            };

            foreach (var kempe in kempeList)
            {
                kempeCollector.Collection.Add(Mapper.Map<KempeList>(kempe));
            }

            return kempeCollector;
        });

    });

運行樣本：

    List<Kempe> kList = new List<Kempe>()
    {
        new Kempe{ Name = "1000", DateTaken = DateTime.Today, Score = 1 },
        new Kempe{ Name = "1000", DateTaken = DateTime.Today, Score = 2 }
    }

    var kColl = Mapper.Map<KempeCollector>(kList);

Answer 2

一切都是關於該映射的手動操作，在我看來，這比linq查詢（您可以通過編寫函數來重用）更糟糕。 但是，如果您想使用AM，至少應嘗試利用其功能。

static void Main()
{
    Mapper.Initialize(cfg =>
    {
        cfg.CreateMap<Kempe, KempeList>();
        cfg.CreateMap<List<Kempe>, KempeCollector>()
            .ForMember(d=>d.Collection, o=>o.MapFrom(s=>s));
    });
    Mapper.AssertConfigurationIsValid();    
    var kList = new List<Kempe>{new Kempe{ Name = "1000", DateTaken = DateTime.Today, Score = 1 }, new Kempe{ Name = "3000", DateTaken = DateTime.Today.AddDays(2), Score = 2 }};
    var kColl = Mapper.Map<KempeCollector>(kList).Dump();
}

public class Kempe
{
   public string Name {get; set;}
   public DateTime DateTaken {get; set;}
   public decimal Score {get; set;}
}

public class KempeCollector
{
   public string FirstName {get; set;}
   public List<KempeList> Collection {get; set;}
}

public class KempeList 
{
   public DateTime DateTaken {get; set;}
   public decimal Score {get; set;}
}