ef-code-first – 如何首先使用代码向Identity默认表AspNetUsers添加多对多关系？

我是Identity framework和Code First方法的新手.现在我在VS 2015上创建一个新的MVC5项目时使用默认项目.

我运行项目时生成的默认表格很好,但我希望它与其他项目一起生成一个名为tbSkills(Id,SkillName)的新表格,它必须与AspNetUsers有多对多的关系.

那么我要写的地方和内容要做到这一点？

ps：我在遵循教程后也将Id类型从字符串更改为int,它运行正常.

这是我在IdentityModels.cs文件中的类ApplicationUser中最后尝试过的：

public class ApplicationUser : IdentityUser<int, MyUserLogin, MyUserRole, MyUserClaim>, IUser<int>
{
    public async Task<ClaimsIdentity> GenerateUserIdentityAsync(UserManager<ApplicationUser, int> manager)
    {
        // Note the authenticationType must match the one defined in CookieAuthenticationOptions.AuthenticationType
        var userIdentity = await manager.CreateIdentityAsync(this, DefaultAuthenticationTypes.ApplicationCookie);
        // Add custom user claims here
        return userIdentity;
    }

    // // This following is my added code 
    public ApplicationUser()
    {
        Skills = new HashSet<tbSkill>();
    }

    public virtual ICollection<tbSkill> Skills { get; set; }
}

public class tbSkill
{
    public tbSkill()
    {
        Users = new HashSet<ApplicationUser>();
    }

    public int Id;
    public string SkillName;

    public virtual ICollection<ApplicationUser> Users { get; set; }
}

它以此错误结束：

我已经研究过很多文章,但没有成功.

尝试添加技能ID

public class ApplicationUser : IdentityUser<int, MyUserLogin, MyUserRole, MyUserClaim>, IUser<int>
{
    public async Task<ClaimsIdentity> GenerateUserIdentityAsync(UserManager<ApplicationUser, int> manager)
    {
        // Note the authenticationType must match the one defined in CookieAuthenticationOptions.AuthenticationType
        var userIdentity = await manager.CreateIdentityAsync(this, DefaultAuthenticationTypes.ApplicationCookie);
        // Add custom user claims here
        return userIdentity;
    }

    // // This following is my added code 
    public ApplicationUser()
    {
        Skills = new HashSet<tbSkill>();
    }
    public int SkillId {get;set;}
    public virtual ICollection<tbSkill> Skills { get; set; }
}