AutoMapper 在简单映射情况下为所有值返回 null

Question

我正在使用带有 MVC 和 Web API 的 Entity Framework 6，我一直在考虑是否将数据传输对象 (DTO) 用于 JSON api 方面。 我遇到了 AutoMapper 并编写了一些 DTO 手动认为（仍然认为）这应该是管理 DTO 的好方法。 所以，新手，通过 Nuget 安装，我尝试了我的第一个映射。从 IdentityUser 派生的 mblUser 类作为源，我想要一个简单的 APIUser 走线..这里是类：

    public class mblUser : IdentityUser 
{
    public async Task<ClaimsIdentity> GenerateUserIdentityAsync(UserManager<mblUser> manager, string authenticationType = DefaultAuthenticationTypes.ApplicationCookie) 
    {
        //authentication type added to provide for Bearer type of authentication. Still defaults to cookie though so as not to impact the code
        // Note the authenticationType must match the one defined in CookieAuthenticationOptions.AuthenticationType
        var userIdentity = await manager.CreateIdentityAsync(this, authenticationType );
        // Add custom user claims here
        return userIdentity;
    }
    [Display(Name = "Date of Birth IDVIEW")]
    [DataType(DataType.DateTime)]
    [DisplayFormat(DataFormatString = "{0:d}",
        NullDisplayText = "Please Enter Your Date of Birth", 
        ApplyFormatInEditMode = true)]

    public DateTime? DateOfBirth { get; set; }
    public string Title { get; set; }
    public string FirstName { get; set; }
    public string MiddleName { get; set; }
    public string LastName {get; set;}
    public string DisplayName { get; set; }
    public virtual Leader Leader { get; set;}
    public virtual Guardian Guardian { get; set; }
    public virtual Participant Participant { get; set; }

    [NotMapped]
    [Display(Name ="Full Name")]
    public string FullName
    {
        get
        {
            return FirstName + (MiddleName !=null ? " " + MiddleName : "") + (LastName != null ? " " + LastName :"");
        }
    }
    [NotMapped]
    [Display(Name ="Details Complete")]
    public bool DetailsComplete
    {
        get
        {
            if (string.IsNullOrEmpty(FullName.Trim()) || string.IsNullOrEmpty(Email) ) 
            {
                // set true if we have something of a name and an email address.. 
                return false;
            }
            else
            {
                return true;
            }
        }
    }
}

.. 这里是 APIUser：

    public class APIUser
{
    private string Id { get; set; }
    private string Email { get; set; }
    private string UserName { get; set; }
    private string Title { get; set; }
    private string FirstName { get; set; }
    private string MiddleName { get; set; }
    private string LastName { get; set; }
    private string DisplayName { get; set; }
    private string PhoneNumber { get; set; }
}

...这里是映射代码：

        // GET: api/userSettings/5
    [ResponseType(typeof(APIUser))]
    public async Task<IHttpActionResult> GetmblUser(string username)
    {
        mblUser User = await UserManager.FindByNameAsync(username);
        if (User == null)
        {
            return NotFound();
        }

        Mapper.CreateMap<mblUser, APIUser>();

        APIUser dto = Mapper.Map<APIUser>(User); <-- here all User members are valid and populated.

        return Ok(dto); <--at a breakpoint here.. all dto members are null.
    }

我想我一定是在做某种新手错误或其他什么，但不知道是什么？我确实想知道这是否是因为 mblUser 是从 IdentityUser 派生的，但文档在这个问题上还很不清楚。

出于兴趣，我确实发现了另一个似乎与 here 相关的问题，而且我的参考文献中确实有 AutoMapper.Net4 以及 AutoMapper，但我也看到其他地方需要它，所以有点卡住了.. 任何帮助将不胜感激。

Answer 1

您需要先公开您的属性，然后才能映射它们。

public class APIUser
{
    public string Id { get; set; }
    public string Email { get; set; }
    public string UserName { get; set; }
    public string Title { get; set; }
    public string FirstName { get; set; }
    public string MiddleName { get; set; }
    public string LastName { get; set; }
    public string DisplayName { get; set; }
    public string PhoneNumber { get; set; }
}