自动映射 - 忽略条件映射

Question

我正在使用automapper,我想知道当该字段为空时是否可以忽略字段的映射.

那是我的代码:

.ForMember(dest => dest.BusinessGroup_Id, 
           opt => opt.MapFrom(src => (int)src.BusinessGroup))

• src.BusinessGroup type = "enum"
• dest.BusinessGroup_Id = int

目标是,如果src.BusinessGroup = null,那就是映射.

Answer 1

我认为NullSubstitute选项可以解决问题

.ForMember(d => d.BusinessGroup_Id, o => o.MapFrom(s => (int?)s.BusinessGroup));
.ForMember(d => d.BusinessGroup_Id, o => o.NullSubstitute(0));

顺便说一下,您可以在映射操作中编写条件:

.ForMember(d => d.BusinessGroup_Id,
           o => o.MapFrom(s => s.BusinessGroup == null ? 0 : (int)s.BusinessGroup));   

更新如果您不能为您的属性分配一些默认值,您可以忽略它并仅映射非空值:

.ForMember(d => d.BusinessGroup_Id, o => o.Ignore())
.AfterMap((s, d) =>
    {
        if (s.BusinessGroup != null)
            d.BusinessGroup_Id = (int)s.BusinessGroup;
    });