Question

我正在跟踪： https://www.c-sharpcorner.com/article/asp-net-core-mvc-authentication-and-role-based-authorization-with-asp-net-core/

我在AplpicationController中有一个错误，不确定如何解决。我非常感谢您的帮助

在下面的Index（）方法中，我在此行上收到错误： NumberOfUsers = r.Users.Count-ApplicationRole不包含Users的定义...

这是ApplicationController类：

public IActionResult Index()
        {
            List<ApplicationRoleListViewModel> model = new List<ApplicationRoleListViewModel>();
            model = roleManager.Roles.Select(r => new ApplicationRoleListViewModel
            {
                RoleName = r.Name,
                Id = r.Id,
                Description = r.Description,
                NumberOfUsers = r.Users.Count
            }).ToList();
            return View(model);

这是ApplicationRoleListViewModel

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace CoreRole.Models
{
    public class ApplicationRoleListViewModel
    {
        public string Id { get; set; }
        public string RoleName { get; set; }
        public string Description { get; set; }
        public int NumberOfUsers { get; set; }
    }
}

Answer 1

我建议这样做： NumberOfUsers =（r.Users！= null）？ r.Users.Count：0

您只能对不为空的列表进行计数。如果列表为空，则计数为零

核心身份-ApplicationController错误

1 个答案: