问如何在mvc5中删除UserManager用户

EN

[HttpPost, ActionName("Delete")]
    [ValidateAntiForgeryToken]
    public async Task<ActionResult> Delete(string id, string role)
    {
        // Check for for both ID and Role and exit if not found
        if (id == null || role == null)
        {
            return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
        }

        // Look for user in the UserStore
        var user = UserManager.Users.SingleOrDefault(u => u.Id == id);

        // If not found, exit
        if (user == null)
        {
            return HttpNotFound();
        }

        // Remove user from role first!
        var remFromRole = await UserManager.RemoveFromRoleAsync(id, role);

        // If successful
        if (remFromRole.Succeeded)
        {
            // Remove user from UserStore
            var results = await UserManager.DeleteAsync(user);

            // If successful
            if (results.Succeeded)
            {
                // Redirect to Users page
                return RedirectToAction("Index", "Users", new {area = "Dashboard"});
            }
            else
            {
                return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
            }
        }
        else
        {
            return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
        }

    }

public UserManagerController()
        : this(new UserManager<User>(new UserStore<User>(new ApplicationDbContext())))
    {
    }

    public UserManagerController(UserManager<User> userManager)
    {
        UserManager = userManager;
    }

    public UserManager<User> UserManager { get; private set; }

    public async Task<ActionResult> Delete (string id)
    {
        var userContext = new ApplicationDbContext();


        var user = UserManager.Users.SingleOrDefault(u => u.Id == id);

        var userStore = new UserStore<User>(userContext);

        await UserManager.DeleteAsync(user);

        // var userManager = new UserManager<User>(userStore);

        // await userManager.DeleteAsync(user);

        return RedirectToAction("Index");
    }