【发布时间】：2019-05-30 13:01:34
【问题描述】：
我正在尝试研究如何使用 ASP.Net core 2.1 在我的 Web 应用程序的管理界面中为用户分配角色。
我还没有找到答案。我的应用程序用户 ID 是基于字符串的，而不是整数。
目前我能够编辑用户、添加新用户、添加新角色、删除角色、编辑角色名称，但无法为用户分配角色。
理想情况下，我想做的是有一个视图，它有两个下拉列表。一个包含所有用户以及我可以分配的可用角色列表。
请问有没有人有关于如何实现这一点的提示？
这是我当前的角色控制器。对于上下文，我使用的是存储库模式。并且已经实现了一些身份模型，ApplicationUser、ApplicationUserRole 和 Application Role。
角色控制器.cs：
[Authorize(Roles = "Admin")]
public class RolesController : Controller
{
private readonly UserManager<ApplicationUser> _userManager;
private readonly RoleManager<ApplicationRole> _roleManager;
private IRepository _repo;
private readonly ApplicationDbContext _context;
public RolesController(UserManager<ApplicationUser> userManager,
RoleManager<ApplicationRole> roleManager, IRepository repo, ApplicationDbContext context)
{
_userManager = userManager;
_roleManager = roleManager;
_repo = repo;
_context = context;
}
public IActionResult Index()
{
List<RoleListViewModel> model = new List<RoleListViewModel>();
model = _roleManager.Roles.Select(r => new RoleListViewModel
{
RoleName = r.Name,
Description = r.Description,
Id = r.Id,
NumberOfUsers = r.UserRoles.Count
}).ToList();
return View(model);
}
[AutoValidateAntiforgeryToken]
public ActionResult Details(string id)
{
var role = _repo.GetRole((string)id);
if (role == null)
{
return RedirectToAction("Index");
}
return View(role);
}
[HttpGet]
public IActionResult Create()
{
return View();
}
[AutoValidateAntiforgeryToken]
[HttpPost]
public async Task<IActionResult> Create(RoleViewModel vm)
{
if (!ModelState.IsValid)
return View(vm);
{
var role = new ApplicationRole
{ Name = vm.Name };
var result = await _roleManager.CreateAsync(role);
if (result.Succeeded)
{
_repo.AddRole(role);
return RedirectToAction("Index");
}
else
foreach (var error in result.Errors)
{
ModelState.AddModelError("", error.Description);
}
return View(vm);
}
}
[HttpGet]
public ActionResult Delete(string Id)
{
var role = _context.Roles.Find(Id);
if (role == null)
{
return RedirectToAction("Index");
}
return View(role);
}
[ValidateAntiForgeryToken]
[HttpPost]
public async Task<ActionResult> Delete([Bind(include: "Id,Name")]ApplicationRole myRole)
{
ApplicationRole role = _context.Roles.Find(myRole.Id);
_context.Roles.Remove(role);
await _context.SaveChangesAsync();
return RedirectToAction("Index");
}
[HttpGet]
public IActionResult Edit(string Id)
{
var role = _repo.GetRole((string)Id);
if (role == null)
{
return RedirectToAction("Index");
}
return View(new RoleViewModel { Id = role.Id, Name = role.Name, Description = role.Description });
}
[HttpPost]
public async Task<IActionResult> Edit(RoleViewModel vm)
{
var role = await _roleManager.FindByIdAsync(vm.Id);
if (vm.Name != role.Name)
{
role.Name = vm.Name;
}
if(vm.Description != role.Description)
{
role.Description = vm.Description;
}
var result = _roleManager.UpdateAsync(role).Result;
if (result.Succeeded)
{
return RedirectToAction("Index", "Roles");
}
else return View(vm);
}
//[HttpGet]
//public async Task<IActionResult> AssignRole(string Id)
//{
// List<UserRolesViewModel> model = new List<UserRolesViewModel>();
// model = _userManager.Users.Select(r => new UserRolesViewModel
// {
// Email = u.Email,
// Description = r.Description,
// Id = r.Id,
// NumberOfUsers = r.UserRoles.Count
// }).ToList();
// return View(model);
//}`
ApplicationUser.cs：
public class ApplicationUser : IdentityUser
{
public string FirstName { get; internal set; }
public string LastName { get; internal set; }
public virtual ICollection<IdentityUserClaim<string>> Claims { get; set; }
public virtual ICollection<IdentityUserLogin<string>> Logins { get; set; }
public virtual ICollection<IdentityUserToken<string>> Tokens { get; set; }
public virtual IEnumerable<ApplicationRole> Roles { get; set; }
public ICollection<ApplicationUserRole> UserRoles { get; set; }
public ICollection<MainComment> MainComments { get; set; }
}
ApplicationUserRole.cs
public class ApplicationUserRole : IdentityUserRole<string>
{
public virtual ApplicationUser User { get; set; }
public virtual ApplicationRole Role { get; set; }
}
ApplicationRole.cs
public class ApplicationRole : IdentityRole
{
public ApplicationRole() : base() { }
public ApplicationRole(string name)
: base(name)
{ }
public virtual ICollection<ApplicationUserRole> UserRoles { get; set; }
public string Description { get; set; }
}
【问题讨论】：
-
代码格式为前缀4个空格。看起来你尝试使用直角括号，如果你想清理它。
-
也许有关您的代码和代码结构的更多信息会对我们有所帮助。 :)
标签： c# asp.net-core asp.net-core-identity