Question

我有两个对象，我想使用AutoMapper属性映射它们，这些是我的目标对象：

public class ClaseB
{
    public string UBLVersionID_nuevo { get; set; }

    public ClaseB_inside objetoB_inside { get; set; }
}

public class ClaseB_inside
{
    public string texto_inside { get; set; }
}

这是我的源类：

[MapsTo(typeof(ClaseB))]
public class ClaseA
{
    [MapsToProperty(typeof(ClaseB), "objetoB_inside.texto_inside")]
    public string texto { get; set; } = "texto prueba";

    [MapsToProperty(typeof(ClaseB), "UBLVersionID_nuevo")]
    public string texto2 { get; set; } = "texto 2 de prueba";
}

当我尝试映射时，我收到以下错误：

错误映射类型

并且有了这个改变：

[MapsTo(typeof(ClaseB))]
public class ClaseA
{
    [MapsToProperty(typeof(ClaseB_inside), "objetoB_inside.texto_inside")]
    public string texto { get; set; } = "texto prueba";

    [MapsToProperty(typeof(ClaseB), "UBLVersionID_nuevo")]
    public string texto2 { get; set; } = "texto 2 de prueba";
}

我在null中获得了ClaseB.objetoB_inside但ClaseB.UBLVersionID_nuevo却有效。

我做错了什么？

Answer 1

我认为问题在于您定义映射的方式。如果您没有使用Automapper属性并且正在通过静态API进行初始化，请考虑以下事项：

        Mapper.Initialize(expression =>
        {
            expression.CreateMap<ClaseA, ClaseB>()
                .ForMember(
                    from => from.objetoB_inside.texto_inside, 
                    to => to.MapFrom(a => a.texto2));
        });

此映射会导致以下异常： Expression 'from => from.objetoB_inside.texto_inside' must resolve to top-level member and not any child object's properties. Use a custom resolver on the child type or the AfterMap option instead.

我认为这与属性定义的问题相同。

所以我建议实施以下内容：

public class MapsToClaseB : MapsToAttribute
{
    public MapsToClaseB() : base(typeof(ClaseB)) { }

    public void ConfigureMapping(IMappingExpression<ClaseA, ClaseB> mappingExpression)
    {
        mappingExpression.AfterMap(
            (a, b) => b.objetoB_inside = new ClaseB_inside{texto_inside = a.texto});
    }
}

然后你需要用这个装饰你的课：

[MapsToClaseB]

使用属性c＃的automapper

1 个答案: