自动映射器映射到可为null的DateTime属性 [英] Automapper map to nullable DateTime property

问题描述

使用Automapper 3.1.1，我无法编译此映射:

using Automapper 3.1.1 I can not compile this map:

Mapper.CreateMap<Domain.DomainObjects.Entities.Patient, PatientDto>()
                .ForMember(x => x.Deleted, opt => opt.MapFrom(input => input.Deleted.HasValue ? 
                    new DateTime(input.Deleted.Value.Ticks, DateTimeKind.Utc) : null ));

错误:

条件表达式的类型无法确定，因为'< null>'之间没有隐式转换和"DateTime"

实体:

public class Patient : Entity
{
        // more properties
        public virtual DateTime? Deleted { get; set; }
}

感觉就像我遗漏了一些明显的东西，但无法确切地知道到底是什么.

Feel like I am missing something obvious but can not figure out what exactly.

注意:Dto包含 DateTime?也删除了

推荐答案

我尚未测试，但是您只需要将 null 强制转换为 DateTime?.((DateTime?)null )

I haven't tested, but you should just need to explicitly cast null to a DateTime?. ((DateTime?)null)

Mapper.CreateMap<Domain.DomainObjects.Entities.Patient, PatientDto>()
                .ForMember(x => x.Deleted, opt => opt.MapFrom(input => input.Deleted == null ? (DateTime?)null : (
                new DateTime(input.Deleted.Value.Ticks, DateTimeKind.Utc))));

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