c# - AutoMapper:为什么 UseValue 只执行一次

Question

为什么UseValue只执行一次？我需要为每个请求调用 TeamRepository。

我怎样才能做到这一点？

从 TeamEmployee 到 TeamEmployeeInput 的映射:

CreateMap<TeamEmployee, TeamEmployeeInput>()
    .ForMember(x => x.Teams, x => x.UseValue(GetTeamEmployeeInputs()))
    .ForMember(d => d.SelectedTeam, s => s.MapFrom(x => x.Team == null ? 0 : x.Team.Id));

private IEnumerable<TeamDropDownInput> GetTeamEmployeeInputs()
{
    Team[] teams = CreateDependency<ITeamRepository>().GetAll();
    return Mapper.Map<Team[], TeamDropDownInput[]>(teams);
}

域对象:

public class TeamEmployee : Entity
{
    public virtual Employee Employee { get; set; }
    public virtual Team Team { get; set; }
}

查看模型对象:

public class TeamEmployeeInput
{
    public int? Id { get; set; }
    public string EmployeeLastName { get; set; }
    public string EmployeeEMail { get; set; }
    public string EmployeeFirstName { get; set; }

    public int SelectedTeam { get; set; }

    public IList<TeamDropDownInput> Teams { get; set; }
}


public class TeamDropDownInput : IDropdownList
{
    public int Id { get; set; }
    public string Text { get; set; }
}

Answer 1

试试 MapFrom 选项。它提供了一个委托(delegate)，每次发生 map 时都会调用该委托(delegate)。从快速 DateTime 测试和我的命令窗口来看，这似乎有效。

类似于:

public class Foo {
    public DateTime bar { get; set; }
}

public class Foo1
{
    public DateTime bar1 { get; set; }
}
Mapper.CreateMap<Foo, Foo1>()
    .ForMember(x => x.bar1, opt => opt.MapFrom(x => DateTime.Now)); // not using x, your function returns the value for bar1

我必须指出这不是 AutoMapper 设计的工作方式。 AutoMapper 应该将属性从一个模型映射到另一个模型。因此，如果 modelA 上不存在数据，则不应将该数据映射到 modelB。

您的代码更改为:

CreateMap<TeamEmployee, TeamEmployeeInput>()
    .ForMember(x => x.Teams, x => x.MapFrom(x => GetTeamEmployeeInputs()))