我有这样的东西:
public class DomainEntity
{
public string Name { get; set; }
public string Street { get; set; }
public IEnumerable<DomainOtherEntity> OtherEntities { get; set; }
public IEnumerable<DomainAnotherEntity> AnotherEntities { get; set; }
}
public class ApiEntity
{
public string Name { get; set; }
public string Street { get; set; }
public int OtherEntitiesCount { get; set; }
}
以及以下映射器配置:
Mapper.Configuration.AllowNullCollections = true;
Mapper.CreateMap<DomainEntity, ApiEntity>().
ForSourceMember(e => e.OtherEntities, opt => opt.Ignore()).
ForSourceMember(e => e.AntherEntities, opt => opt.Ignore()).
ForMember(e => e.OtherEntitiesCount, opt => opt.MapFrom(src => src.OtherEntities.Count()));
Mapper.CreateMap<ApiEntity, DomainEntity>().
ForSourceMember(e => e.OtherEntitiesCount, opt => opt.Ignore()).
ForMember(e => e.OtherEntities, opt => opt.Ignore()).
ForMember(e => e.AnotherEntities, opt => opt.Ignore());
要从我使用的 DomainEntity 获取 ApiEntity var apiEntity = Mapper.Map<DomainEntity, ApiEntity>(myDomainEntity);
要从我使用的 ApiEntity 中获取合并的 DomainEntity var domainEntity = Mapper.Map(myApiEntity, myDomainEntity);
但是当使用它时,属性 OtherEntities
和 AnotherEntities
设置为 null
- 即使它们在从 myApiEntity
调用映射之前具有值至 myDomainEntity
.我怎样才能避免这种情况,使它们真正合并而不仅仅是替换值?
感谢您的帮助。
最佳答案
我认为您正在寻找 UseDestinationValue
而不是 Ignore
:
Mapper.CreateMap<ApiEntity, DomainEntity>().
ForSourceMember(e => e.OtherEntitiesCount, opt => opt.UseDestinationValue()).
ForMember(e => e.OtherEntities, opt => opt.UseDestinationValue()).
ForMember(e => e.AnotherEntities, opt => opt.UseDestinationValue());
关于c# - AutoMapper 将目标对象上的属性设置为 null,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/16125997/