ASP.NET Core 2.1 显示用户和角色

Posted 2023-02-24

【中文标题】ASP.NET Core 2.1 显示用户和角色

【英文标题】：ASP.NET Core 2.1 displaying users and roles

【发布时间】：2019-07-10 19:46:24

【问题描述】：

为了显示用户及其在核心 2.1 中的角色，我遵循了示例 *** 。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)

【参考方案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>
        
    

【讨论】：

我没有意识到我的类在我的 ApplicationUser 类中，我现在可以通过视图看到它。谢谢，它只是很少的资源在 asp 2.1 中的角色