我试图映射包含源类的对象数组,这些对象必须映射目标类。
class A
{
public string Id { get; set; }
public string Name { get; set; }
public string Url { get; set; }
public string Details { get; set; }
public string Image { get; set; }
public string Decription{ get; set;}
}
class B
{
public string Id { get; set; }
public string Name { get; set; }
public List<C> { get; set; }
}
class C{
public string Url { get; set; }
public string Details { get; set; }
public string Image { get; set; }
public string Decription{ get; set;}
}
我需要使用自动映射器从B类列表映射到List类A. 请帮助
答案 0 :(得分:2)
这很简单。您必须分两步映射信息。
首先让我们简化你的例子:
class A {
public string AttrB { get; set; }
public string AttrC { get; set; }
}
class B {
public string AttrB { get; set; }
}
class C {
public string AttrC { get; set;}
}
要从B和C创建A的一个对象,您必须创建两个地图并相互使用它们:
Mapper.CreateMap<B, A>();
Mapper.CreateMap<C, A>();
var c = new C { AttrC = "AttrCValue" };
var b = new B { AttrB = "AttrBValue" };
var a = Mapper.Map<A>(b); // a with the attribute values of b
Mapper.Map(c, a); // map the attribute values of c also into a
我觉得没什么新鲜事。但现在是棘手的部分。它的工作原理相同:
class A {
public string AttrB { get; set; }
public string AttrC { get; set; }
}
class B {
public string AttrB { get; set; }
public List<C> AttrBList { get; set; }
}
class C {
public string AttrC { get; set;}
}
我们需要另一张地图和自定义转换器:
Mapper.CreateMap<B, A>();
Mapper.CreateMap<C, A>();
Mapper.CreateMap<B, IEnumerable<A>>().ConvertUsing<BConverter>();
class BConverter : ITypeConverter<B, IEnumerable<A>> {
public IEnumerable<A> Convert(ResulutionContext ctx) {
B b = (B)ctx.SourceValue;
foreach(var aFromC in b.AttrBList.Select(c => Mapper.Map<A>(c))) { // map c attributes into an a object and return it (through Select it's a mapping for all items of the list AttrBList)
Mapper.Map(b, aFromC); // push the attribute values from b to the aFromC object. Because this is inside the loop, it happens for every Item in the AttrBList array
yield return aFromC;
}
}
}
现在你可以使用它了:
var allAObjects = Mapper.Map<IEnumerable<A>>(listOfBObjects);