AutoMapper .Ignore（）在二级集合映射中不起作用

Question

我在使用.Ignore()时遇到麻烦。 我有一个Employee实体，在Employee实体中，我有List_TaskEntity，在List_TaskEntity内部，我有List_TaskUserEntity。我还具有所有实体的DTO模型。 我无法做的是：我不想允许客户通过List_TaskUserEntity编辑EmployeeModel， 因此在映射中，我想这样忽略List_TaskUser；

cfg.CreateMap<TaskModel, TaskEntity>().ForMember(z => z.Users, opt => opt.Ignore()); //doesnt work,
cfg.CreateMap<TaskModel, TaskEntity>().ForMember(z => z.Users, opt => opt.UseDestinationValue()); //doesnt work

所需结果； 无论我是否在Employee模型中编辑用户集合，映射后都应始终为我带来未修改的用户实体列表。

非常感谢。

public class EmployeeEntity
{
    public int Id { get; set; }
    public string Name { get; set; }
    public int Age { get; set; }
    public List<TaskEntity> Tasks { get; set; }
}
public class EmployeeModel
{
    public int Id { get; set; }
    public string Name { get; set; }
    public int Age { get; set; }
    public List<int> Salary { get; set; }

    public List<TaskModel> Tasks { get; set; }
}

public class TaskModel
{
    public int TaskId { get; set; }
    public string Name { get; set; }
    public ICollection<TaskUserModel> Users { get; set; }
}
public class TaskUserModel
{
    public int TaskId { get; set; }
    public int UserId { get; set; }
}

public class TaskEntity
{
    public int TaskId { get; set; }
    public string Name { get; set; }
    public ICollection<TaskUserEntity> Users { get; set; }
}

public class TaskUserEntity
{
    public int TaskId { get; set; }
    public int UserId { get; set; }
}

class Program
{
    static void Main(string[] args)
    {
        var config = new MapperConfiguration(cfg =>
        {

            cfg.CreateMap<EmployeeEntity, EmployeeModel>();
            cfg.CreateMap<EmployeeModel, EmployeeEntity>();

            cfg.CreateMap<TaskEntity, TaskModel>();
            cfg.CreateMap<TaskModel, TaskEntity>().ForMember(z => z.Users, opt => opt.Ignore());


            cfg.CreateMap<TaskUserEntity, TaskUserModel>();
            cfg.CreateMap<TaskUserModel, TaskUserEntity>();
        });
        var entity = new EmployeeEntity()
        {
            Id = 1,
            Age = 5,
            Name = "Joseph",
            Tasks = new List<TaskEntity>() {
            new TaskEntity()
            {
                Name="X",
                TaskId=1,
                Users=new List<TaskUserEntity>() { new TaskUserEntity() {TaskId=1,UserId=2 } }
            }
        }
        };
        var model = new EmployeeModel()
        {
            Id = 1,
            Age = 5,
            Name = null,
            Tasks = new List<TaskModel>() {
            new TaskModel()
            {
                Name="X",
                TaskId=1,
                Users=null // In model i am making it null, but it should brng me taskusers list anyhow.
            } }

        };

        var mapper = config.CreateMapper();
        var updatedEntity = mapper.Map(model, entity);
    }
}