ApplicationUser ICollection 成员未保存在数据库中答案

【问题标题】：ApplicationUser ICollection member not being saved in DBApplicationUser ICollection 成员未保存在数据库中
【发布时间】：2015-09-07 02:22:13
【问题描述】：

我已经向 ApplicationUser 添加了一些属性，其中两个是 ICollection 的。当我使用 Update-Database 时，它不会为这两个成员生成列。

那么，我在这里缺少什么？我想这是非常基本的。我习惯于在 Java 中使用 Hibernate，它会为元素集合生成一个新表。

一些代码示例 -

应用程序用户

public class ApplicationUser : IdentityUser
{
    public string FirstName { get; set; }

    public string LastName { get; set; }

    public byte[] UserImage { get; set; }

    public virtual ICollection<string> Interests { get; set; }

    public virtual ICollection<string> Friends { get; set; }

}

注册视图模型

public class RegisterViewModel
{
    [Required]
    [Display(Name = "Username")]
    public string UserName { get; set; }

    [Required]
    [StringLength(25)]
    [Display(Name = "First Name")]
    public string FirstName { get; set; }

    [Required]
    [StringLength(25)]
    [Display(Name = "Last Name")]
    public string LastName { get; set; }

    [Display(Name = "User Image")]
    public int UserImage { get; set; }

    [Required]
    [Display(Name = "Interests")]
    public virtual ICollection<string> Interests { get; set; }

    [Display(Name = "Friends")]
    public virtual ICollection<string> Friends { get; set; }

    //........

任务寄存器（RegisterViewModel 模型）

 public async Task<ActionResult> Register(RegisterViewModel model)
    {
        if (ModelState.IsValid)
        {
            var user = new ApplicationUser()
            {
                UserName = model.UserName,
                FirstName = model.FirstName,
                LastName = model.LastName,
                Interests = model.Interests,
                Friends = model.Friends
            };

            HttpPostedFileBase file = Request.Files["file"];
            byte[] imgBytes = null;

            BinaryReader reader = new BinaryReader(file.InputStream);
            imgBytes = reader.ReadBytes(file.ContentLength);

            user.UserImage = imgBytes;


            var result = await UserManager.CreateAsync(user, model.Password);
            if (result.Succeeded)
            //............

【问题讨论】：

标签： c# .net entity-framework asp.net-mvc-4 asp.net-mvc-5

【解决方案1】：

您需要为您的收藏品建模。您可以多对多或一对多。

// many to many
public class Interest
{
    public int InterestId { get; set; }
    public string InterestDesc { get; set; } // field can't match class name
}

// one to many
public class Interest
{
    public int UserId { get; set; }  // Make primary key the FK into application user
    public string InterestDesc { get; set; } // field can't match class name
}

然后更改您的收藏

public virtual ICollection<Interest> Interests { get; set; }

不要忘记将 DbSet 添加到上下文中。对 Friends 和其他字符串集合重复此操作。

【讨论】：