c# - 忽略一项的嵌套列表的自动映射器

Question

我有以下模型，用户模型有角色列表。

public class User
{
    public string Username { get; set; }
    public List<Role> Roles { get; set; }
}

public class Role
{
    public Guid RoleID { get; set; }
    public string Name { get; set; }
    public string Value { get; set; }
}


public class UserSourceModel
{
    public string Username { get; set; }
    public List<RoleSourceModel> Roles { get; set; }
}

public class RoleSourceModel
{
    public string Name { get; set; }
    public string Value { get; set; }
}

映射器：

 Mapper.CreateMap<UserSourceModel, User>();
            Mapper.CreateMap<RoleSourceModel, Role>()
                .ForMember(dest => dest.RoleID, opt => opt.Ignore());

我不希望 RoleID 从源映射，所以我提到了这个忽略并保留目标的值。

虚拟数据：

            //// data from UI
            UserSourceModel sourceData = new UserSourceModel
            {
                Username = "NewUser",
                Roles = new List<RoleSourceModel> { new RoleSourceModel { Name = "Admin", Value = "Admin" } }
            };

            //// data in database
            User destinationData = new User
            {
                Username = "UserInDB",
                Roles = new List<Role> { new Role { RoleID = Guid.NewGuid(), Name = "Staff", Value = "Staff" } }
            };

尝试映射：

var userOutPut = Mapper.Map<UserSourceModel, User>(sourceData, destinationData);

我预计 RoleID 应该是已经存在于用户模型 ( Guid.NewGuid()) 中的值，但我得到了空的 Guid ( 00000000-0000-0000-0000-000000000000)。

Answer 1

对我来说，使用 List<> 和 UseDestinationValue()

Mapper.CreateMap<UserSourceModel, User>();
Mapper.CreateMap<List<RoleSourceModel>, List<Role>>();
Mapper.CreateMap<RoleSourceModel, Role>()
    .ForMember(dest => dest.RoleID, opt => opt.UseDestinationValue());

Answer 2

我认为您需要再添加一张地图。

        Mapper.CreateMap<UserSourceModel, User>();         
        Mapper.CreateMap<List<RoleSourceModel>,List<Role>>();
     Mapper.CreateMap<RoleSourceModel, Role>()
         .ForMember(dest => dest.RoleID, o => o.Ignore());