how to use role in mvc identity 2.1.0 - model-view-controller

Question

I want to introduce the identity role to my login page .the user after entering username and password should select a dropdownlist of roles (superuser-admin-user).how could that happen?

Answer 1

Create a class to manage roles, that would be something like ApplicationRoleManager
public class ApplicationRoleManager : RoleManager<IdentityRole, string>
{
public ApplicationRoleManager(IRoleStore<IdentityRole, string> roleStore)
: base(roleStore)
{
}
public static ApplicationRoleManager Create(IdentityFactoryOptions<ApplicationRoleManager> options, IOwinContext context)
{
return new ApplicationRoleManager(new RoleStore<IdentityRole, string, IdentityUserRole>(context.Get<ApplicationDbContext>()));
}
}
Then you need to create instance of ApplicationRoleManager on owin startup. Add below code inside the ConfigureAuth method on Owin startup. App_Start >> Startup.Auth.cs
app.CreatePerOwinContext<ApplicationRoleManager>(ApplicationRoleManager.Create);
Now you have all setup for manage your roles. Make sure you have added roles to your 'AspNetRoles' table
Then you can retrieve roles as below inside the Login (Get) action
// GET: /Account/Login
[AllowAnonymous]
public ActionResult Login(string returnUrl)
{
var roleManager = HttpContext.GetOwinContext().Get<ApplicationRoleManager>();
var roles = roleManager.Roles.ToList();
var list = new SelectList(roles, "Id", "Name");
ViewBag.Roles = list;
ViewBag.ReturnUrl = returnUrl;
return View();
}
Then you can get roles in the Login view. After that populate dropdownList with roles. Your rasor script will look like below.
#using (Html.BeginForm("Login", "Account", new { ReturnUrl = ViewBag.ReturnUrl }, FormMethod.Post, new { #class = "form-horizontal", role = "form" }))
{
#Html.AntiForgeryToken()
<h4>Use a local account to log in.</h4>
<hr />
#Html.ValidationSummary(true, "", new { #class = "text-danger" })
<div class="form-group">
#Html.LabelFor(m => m.Email, new { #class = "col-md-2 control-label" })
<div class="col-md-10">
#Html.TextBoxFor(m => m.Email, new { #class = "form-control" })
#Html.ValidationMessageFor(m => m.Email, "", new { #class = "text-danger" })
</div>
</div>
<div class="form-group">
#Html.LabelFor(m => m.Password, new { #class = "col-md-2 control-label" })
<div class="col-md-10">
#Html.PasswordFor(m => m.Password, new { #class = "form-control" })
#Html.ValidationMessageFor(m => m.Password, "", new { #class = "text-danger" })
</div>
</div>
<div class="form-group">
<label id="RoleDdlLabel" class="col-md-2 control-label">Select Role</label>
<div class="col-md-10">
#Html.DropDownList("RoleList", ViewBag.Roles as SelectList)
</div>
</div>
<div class="form-group">
<div class="col-md-offset-2 col-md-10">
<div class="checkbox">
#Html.CheckBoxFor(m => m.RememberMe)
#Html.LabelFor(m => m.RememberMe)
</div>
</div>
</div>
<div class="form-group">
<div class="col-md-offset-2 col-md-10">
<input type="submit" value="Log in" class="btn btn-default" />
</div>
</div>
<p>
#Html.ActionLink("Register as a new user", "Register")
</p>
#* Enable this once you have account confirmation enabled for password reset functionality
<p>
#Html.ActionLink("Forgot your password?", "ForgotPassword")
</p>*#
}
I hope you can finish the saving part by posting the selected role with other model values. You can change the LoginViewModel to include roles.
Hope this helps.