Question

我是实体框架和ASP.NET MVC的新手。在我的项目中，我正在尝试为用户分配角色。当我尝试为用户分配角色时，会生成此错误。即使我尝试在调试器中查看，我仍然可以很好地获得期望的角色ID和用户ID，但是当将这些id传递给userManager.AddToRole(User,Role)时，它表示角色不存在。

这是我创建角色的种子方法。这些角色将在AspNetRoles表中创建。

internal sealed class Configuration : DbMigrationsConfiguration<VacationProjectV2.Models.ApplicationDbContext>
{
    private RoleManagement roleManager;
    private ApplicationDbContext dbContext;
    public Configuration()
    {
        AutomaticMigrationsEnabled = false;
        dbContext = new ApplicationDbContext();
        roleManager = new RoleManagement(dbContext);
    }

    protected override void Seed(VacationProjectV2.Models.ApplicationDbContext context)
    {
        //  This method will be called after migrating to the latest version.C:\Users\brahm\source\repos\VacationProjectV2\VacationProjectV2\App_Start\
        //  You can use the DbSet<T>.AddOrUpdate() helper extension method 
        //  to avoid creating duplicate seed data.
        roleManager.CreateRole("Admin")   //.ToString().ToUpper();
        roleManager.CreateRole("ProjectManager")  //.ToString().ToUpper();
        roleManager.CreateRole("Developer") //.ToString().ToUpper();
    }
}

这是我要分配给我的AdminController。

public class AdminsController : Controller
{
    ApplicationDbContext db = new ApplicationDbContext();
    UserManager<ApplicationUser> userManager;
    RoleManager<IdentityRole> roleManager;

    public AdminsController()
    {
        roleManager = new RoleManager<IdentityRole>(new RoleStore<IdentityRole>(db));
        userManager = new UserManager<ApplicationUser>(new UserStore<ApplicationUser>(db));
    }
    // GET: Admins

    public ActionResult AssignRole()
    {
        ViewBag.Users = new SelectList(db.Users, "Id", "UserName");
        ViewBag.Roles = new SelectList(db.Roles, "Id", "Name");
        return View();
    }

    [HttpPost]
    public ActionResult AssignRole(string Users,String Roles)
    {
        userManager.AddToRole(Users, Roles);
        ViewBag.Users = new SelectList(db.Users, "Id", "UserName");
        ViewBag.Roles = new SelectList(db.Roles, "Id", "Name");
        return View();
    }
    public ActionResult Index()
    {
        return View();
    }
}

这里是View代码

@{
    ViewBag.Title = "AssignRoles";
}

<h2>AssignRoles</h2>
@using (Html.BeginForm())
{
    @Html.DropDownList("Users", "Select User");
    @Html.DropDownList("Roles","Select Role")
    <input type="Submit" value="Add Role"/>
}

所以我想在UserId表中看到RoleId和AspNetUserRoles。我不知道我在哪里犯错。我尝试使用.Tostrong().ToUpper()在种子方法中创建角色，方法是看到另一篇存在相同问题的帖子，但对我不起作用。请让我知道我在哪里出错。

Answer 1

对不起，我不好，我没有正确检查方法所需的参数。错误是userManager.AddToRole()。需要roleName而不是roleId作为参数。

 public ActionResult AssignRoles()
        {
            ViewBag.Users = new SelectList(db.Users, "Id", "UserName");
            ViewBag.Roles = new SelectList(db.Roles, "Name", "Name"); // Here I was Passing the Id insted Of Role Name.
            return View();
        }
        [HttpPost]
        public ActionResult AssignRoles(string Users,string Roles)
        {
            usersManager.AddToRole(Users, Roles);
            ViewBag.Users = new SelectList(db.Users, "Id", "UserName");
            ViewBag.Roles = new SelectList(db.Roles, "Name", "Name");
            return View();
        }

userManagerAddToRole（User，Role）：System.InvalidOperationException：RoleDoes“随机角色ID字符串”不存在

1 个答案: