AutoMapper在验证期间抛出"无默认构造函数"

Question

我有要映射的类,但它们没有默认的构造函数,我不希望它们有.这是因为我只映射到现有对象/从现有对象映射.

public class Order
{
    public string OrderName { get; set; }
    public Order(string name) 
    { 
        this.OrderName = name; 
    }
}

public class OrderProcessor
{
    private IService service;
    public string OrderName { get; set; }

    public OrderProcessor(IService service)
    { 
        this.service = service; 
        Mapper.Initialize(config => config.CreateMap<Order, OrderProcessor>());
    }

    public void Init()
    { 
        var order = this.service.GetOrder();

        // this works
        Mapper.Map(order, this);

        // this fails
        Mapper.Configuration.AssertConfigurationIsValid();
    }
}

AutoMapper.AutoMapperConfigurationException:找到未映射的成员.查看下面的类型和成员.添加自定义映射表达式,忽略,添加自定义解析程序或修改源/目标类型对于无匹配的构造函数,添加无参数ctor,添加可选参数或映射所有构造函数参数

订单 - > OrderProcessor(目标成员列表)

没有可用的构造函数.

在Tests.cs中的Test():行

当我不想创建新对象时,如何使配置断言传递以及失败的原因？

Answer 1

最近在从Automapper 4.x升级到6.x之后,我偶然发现了这个问题.

您需要告诉AutoMapper您不打算通过调用来构造目标类型CreateMap<TSource, TDest>().DisableCtorValidation().

根据方法文档:

    // Summary:
    //     Disable constructor validation. During mapping this map is used 
    //     against an existing destination object and never constructed itself.
    //