ASP.NET Core 2.1 显示用户和角色

Question

为了显示用户及其在核心 2.1 中的角色，我遵循了示例 stackoverflow 。我没有错误，但我没有显示用户角色。我认为这可能是我的观点，由于某种原因，我的代码返回了一个电子邮件地址而不是用户角色。

ApplicationDbContext

public class ApplicationDbContext : IdentityDbContext<ApplicationUser, 
ApplicationRole, string, IdentityUserClaim<string>,
ApplicationUserRole, IdentityUserLogin<string>,
IdentityRoleClaim<string>, IdentityUserToken<string>>

{
    public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options)
       : base(options)
    {
    }

    protected override void OnModelCreating(ModelBuilder builder)
    {
        base.OnModelCreating(builder);

        builder.Entity<ApplicationUserRole>(userRole =>
        {
            userRole.HasKey(ur => new { ur.UserId, ur.RoleId });

            userRole.HasOne(ur => ur.Role)
                .WithMany(r => r.UserRoles)
                .HasForeignKey(ur => ur.RoleId)
                .IsRequired();

            userRole.HasOne(ur => ur.User)
                .WithMany(r => r.UserRoles)
                .HasForeignKey(ur => ur.UserId)
                .IsRequired();
        });
    }

    public DbSet<ApplicationUser> ApplicationUser { get; set; }
}

Startup.cs

services.AddIdentity<ApplicationUser, ApplicationRole>()
      .AddEntityFrameworkStores<ApplicationDbContext>()
      .AddDefaultUI()
      .AddDefaultTokenProviders();

应用程序用户

public class ApplicationUser : IdentityUser
{
    public ICollection<ApplicationUserRole> UserRoles { get; set; }

    public class ApplicationUserRole : IdentityUserRole<string>
    {
        public virtual ApplicationUser User { get; set; }
        public virtual ApplicationRole Role { get; set; }
    }
    public class ApplicationRole : IdentityRole
    {
        public ICollection<ApplicationUserRole> UserRoles { get; set; }
    }
}

索引方法：

public async Task<IActionResult> Index(int? page )
{
   var users = from u in _userManager.Users.Include(u => u.UserRoles).ThenInclude(ur => ur.Role) select u;

   return View(users.ToPagedList(pageNumber, pageSize));
}

查看

@Html.DisplayFor(m => item.UserRoles)

Answer 1

您将所有内容都放在ApplicatonUser 类中。首先重新排列您的模型类，如下所示：

public class ApplicationUser : IdentityUser
{
    public ICollection<ApplicationUserRole> UserRoles { get; set; }
}

public class ApplicationUserRole : IdentityUserRole<string>
{
    public virtual ApplicationUser User { get; set; }
    public virtual ApplicationRole Role { get; set; }
}

public class ApplicationRole : IdentityRole
{
    public ICollection<ApplicationUserRole> UserRoles { get; set; }
}

现在UserRoles 是一个集合，你不能用@Html.DisplayFor(m => item.UserRoles) 显示它，而是你必须按如下方式遍历这个集合：

@model List<ApplicationUser>
@{
    foreach (ApplicationUser applicationUser in Model)
    {
        <div>UserName : @applicationUser.UserName</div>
        <br/>
        <h4>User's Role</h4>
        <hr/>
        foreach (ApplicationUserRole applicationUserRole in applicationUser.UserRoles)
        {
            <div>RoleName: @applicationUserRole.Role.Name</div>
        }
    }
}