C＃LINQ IdentityContext多组联接

如何解决C＃LINQ IdentityContext多组联接

我有这个LINQ：

var users = _ctx.Users
    .AsEnumerable() // or "InvalidOperationException: This may indicate either a bug or a limitation in EF Core"
    .GroupJoin(_ctx.UserClaims,u => u.Id,c => c.UserId,(user,claims) => new { user,claims })
    .GroupJoin(_ctx.UserRoles,uc => uc.user.Id,r => r.UserId,(uc,roles) => new { uc.user,uc.claims,roles })
    .ToList()
    .Select(ucr => new UserDto
        {
            Id = ucr.user.Id,UserName = ucr.user.UserName,FirstName = ucr.user.FirstName,LastName = ucr.user.LastName,LastLogin = ucr.user.LastLogin,LockoutEnd = ucr.user.LockoutEnd,LockoutEnabled = ucr.user.LockoutEnabled,Roles = ucr.roles.Select(x => x.RoleId).Distinct().ToList(),// Here i would like the Role Name from the Roles Table by the UserRoles
            Scopes = ucr.claims.Select(x => x.ToClaim()).Where(x => x.Type.Equals(Shared.Scopes.Key)).Select(x => x.Value).ToList(),Claims = ucr.claims.Select(x => x.ToClaim()).Where(x => !x.Type.Equals(Shared.Scopes.Key)).ToList(),Enabled = ucr.user.Enabled
    }
).ToList();

这工作得很好，但我想从UserRoles获取用户的实际角色，而不仅仅是从用户到角色的映射

我尝试添加其他GroupJoin： .GroupJoin(_ctx.Roles,ucr => ucr.roles.Id,r => r.Id,(ucr,r) => new { u,r }) 但是由于roles是一个列表，我得到一个错误：

'IEnumerable '不包含定义 用于“ Id”，并且没有可访问的扩展方法“ Id”接受第一个 类型为“ IEnumerable ”的参数

有什么想法我也可以获取实际的角色列表吗？

我正在使用ApplicationUser以外的默认Identity类

    public class ApplicationUser : IdentityUser
    {
        /// <summary>
        /// First Name
        /// </summary>
        [Display(Name = "First Name")]
        public string FirstName { get; set; }

        /// <summary>
        /// Last Name
        /// </summary>
        [Display(Name = "Last Name")]
        public string LastName { get; set; }

        /// <summary>
        /// Profile Picture
        /// </summary>
        public byte[] ProfilePicture { get; set; }

        /// <summary>
        /// Enabled
        /// </summary>
        public bool Enabled { get; set; }

        /// <summary>
        /// Last Login
        /// </summary>
        [Display(Name = "Last Login")]
        [DataType(DataType.DateTime)]
        [DisplayFormat(ApplyFormatInEditMode = true,NullDisplayText = "N/A",DataFormatString = "{0:yyyy-MM-dd HH:mm}")]
        public DateTime? LastLogin { get; set; } = null;

        /// <summary>
        /// Display Name
        /// </summary>
        [NotMapped]
        public string DisplayName => $"{FirstName} {LastName}";
    }

和UserDto

public class UserDto
    {
        public UserDto()
        {
            Id = Guid.NewGuid().ToString();
            ConcurrencyStamp = Guid.NewGuid().ToString();
        }

        public string Id { get; set; }

        public string UserName { get; set; }

        public string NormalizedUserName => UserName.ToUpper();

        public string Email => UserName;

        public string NormalizedEmail => Email.ToUpper();

        public bool EmailConfirmed { get; set; }

        public string PasswordHash { get; set; }

        public string SecurityStamp { get; set; }

        public string ConcurrencyStamp { get; set; }

        public string PhoneNumber { get; set; }

        public bool PhoneNumberConfirmed { get; set; }

        public bool TwoFactorEnabled { get; set; }

        public DateTimeOffset? LockoutEnd { get; set; }

        public bool LockoutEnabled { get; set; }

        public int AccessFailedCount { get; set; }

        public string FirstName { get; set; }

        public string LastName { get; set; }

        public byte[] ProfilePicture { get; set; }

        public DateTime? LastLogin { get; set; }

        public bool Enabled { get; set; }

        public List<string> Roles { get; set; }

        public List<Claim> Claims { get; set; }

        public List<string> Scopes { get; set; }
    }

解决方法

加入UserRoles和Roles，因此使用组加入。

     var users = _ctx.Users
        .AsEnumerable()
        .GroupJoin(_ctx.UserClaims,u => u.Id,c => c.UserId,(user,claims) => new { user,claims })
        .GroupJoin(
            _ctx.UserRoles.Join(_ctx.Roles,ur => ur.RoleId,r => r.Id,(userRole,role) => new { userRole,role }),uc => uc.user.Id,r => r.userRole.UserId,(uc,roles) => new { uc.user,uc.claims,roles})
        .Select(ucr => new
        {
            Id = ucr.user.Id,UserName = ucr.user.UserName,FirstName = ucr.user.FirstName,LastName = ucr.user.LastName,LastLogin = ucr.user.LastLogin,LockoutEnd = ucr.user.LockoutEnd,LockoutEnabled = ucr.user.LockoutEnabled,Roles = ucr.roles.Select(x => x.role.Name).Distinct().ToList(),Scopes = ucr.claims.Select(x => x.ToClaim()).Where(x => x.Type.Equals(Shared.Scopes.Key)).Select(x => x.Value).ToList(),Claims = ucr.claims.Select(x => x.ToClaim()).Where(x => !x.Type.Equals(Shared.Scopes.Key)).ToList(),Enabled = ucr.user.Enabled
        }
    ).ToList();