Question

我正在尝试将我的DTO对象映射到工厂类中的实体对象。 DTO具有所有字段值，而实体具有由名称和值组成的字段。

经过一些调试，我发现Automapper实例化每个实体字段而不是使用现有字段。结果，最后一次测试失败了。

[TestFixture]
class RecursiveMappingTest
{
    public class SourceInfo
    {
        public string Info1 = "info1";
        public string Info2 = "info1";
    }

    public class StringField
    {
        public string Name;
        public string Value;
    }

    public class DestinationInfo
    {
        public StringField Info1 = new StringField() { Name = "field name 1" };
        public StringField Info2 = new StringField() { Name = "field name 2" };
    }

    [Test]
    public void MapField()
    {
        Mapper.CreateMap<string, StringField>()
            .ForMember(dest => dest.Value, opt => opt.MapFrom(src => src));

        Mapper.CreateMap<SourceInfo, DestinationInfo>();

        SourceInfo sourceInfo = new SourceInfo();
        DestinationInfo destinationInfo = new DestinationInfo();

        Mapper.Map(sourceInfo, destinationInfo);

        // these pass
        Assert.That(destinationInfo.Info1.Value, Is.EqualTo("info1"));
        Assert.That(destinationInfo.Info2.Value, Is.EqualTo("info1"));

        // this fails since automapper instantiated brand new StringField()
        // which has Name == "".
        Assert.That(destinationInfo.Info1.Name, Is.EqualTo("field name 1"));
    }
}

这是预期的行为吗？我怎样才能实现我的目标？实体类中有大量字段this workaround will not work for me。

Answer 1

尝试将第二张地图更改为：

Mapper.CreateMap<SourceInfo, DestinationInfo>()
.ForAllMembers(x => x.UseDestinationValue());

这应该使用所有未映射属性的目标值。

Automapper实例化目标对象，而不是递归映射

1 个答案: