Question

我有一个页面正在尝试显示所有用户及其分配的角色。

我能够获得我的角色，所有角色和所有用户...。但是我似乎无法弄清楚如何在同一查询中获得用户及其角色？

 public class IndexModel : PageModel
 {
    private readonly FishRoomDbContext _context;

    public IndexModel(FishRoomDbContext application)
    {
        _context = application;
    }

    public List<ApplicationUser> Users { get; private set; }

    public List<IdentityUserRole<string>> UsersRoles { get; set; }  // get my roles or context of user

    public List<IdentityRole> AllRoles { get; private set; }

    public void OnGet()
    {
        Users = _context.Users.ToList();
        UsersRoles = _context.UserRoles.ToList(); // get my roles or context 
        of user
        AllRoles = _context.Roles.ToList();
    }
}

我将如何显示该信息？

Answer 1

public class User{
//Foreign Key Reference
  public virtual ICollection<UserRole> UserRoles { get; set; }
}
public class UserRole{
//Foreign Key Reference
 public int userID{get;set;} //ID field of user
 public virtual User User { get; set; }
}
public partial class FishRoomDbContext : DbContext
{
 public FishRoomDbContext()
    : base("name=ConnectionStringName")
 {
   this.Configuration.LazyLoadingEnabled = false;
 }
 protected override void OnModelCreating(DbModelBuilder modelBuilder)
 {
   modelBuilder.Entity<User>()
            .HasMany(e => e.UserRoles)
            .WithRequired(e => e.User)
            .HasForeignKey(e => e.userID)
            .WillCascadeOnDelete(false);
 }

您的方法

public void OnGet()
    {
        Users = _context.Users.Include("UserRoles").ToList();
        UsersRoles = _context.UserRoles.ToList(); // get my roles or context 
        of user
        AllRoles = _context.Roles.ToList();
    }

我所做的是，我添加了外键引用，也在您的dbms中进行了操作。现在，当您调用方法OnGet()时，将获取所有用户及其角色。角色将位于User.UserRoles属性中。

创建用户及其角色的列表DataTable .Net Core 2.1剃刀页

1 个答案: