Create Role using Identity Framework

Question

Create Role using Identity Framework

Joe Green 146

Hello,

I'm new to Asp.Net Core. I'm using .Net 7 for MVC web application. I'm using Identity and in my application I have only one role - Manager. In .Net 4.8, I would write a code like this in Startup.cs

        public void Configuration(IAppBuilder app)  
        {  
            ConfigureAuth(app);  
            createRolesandUsers();  
        }  
  
        private void createRolesandUsers()  
        {  
            ApplicationDbContext context = new ApplicationDbContext();  
  
            var roleManager = new RoleManager<IdentityRole>(new RoleStore<IdentityRole>(context));  
            var UserManager = new UserManager<ApplicationUser>(new UserStore<ApplicationUser>(context));  
      
            if (!roleManager.RoleExists("Manager"))  
            {  
                var role = new Microsoft.AspNet.Identity.EntityFramework.IdentityRole();  
                role.Name = "Manager";  
                roleManager.Create(role);  
  
            }  
        }

Since Startup.cs has been replaced by Program.cs. How should I do this in Program.cs in asp.net core?

Joe

Accepted answer

2 additional answers

Your answer

Answer 1

Assuming you used the Identity tempate in .NET 7, simply add the "AddRole()" configuration as shown below.

builder.Services.AddDefaultIdentity<IdentityUser>(options => options.SignIn.RequireConfirmedAccount = true)  
    .AddRoles<IdentityRole>()  
    .AddEntityFrameworkStores<ApplicationDbContext>();

In the controller used standard dependency injection.

    public class RoleController : Controller  
    {  
        private readonly RoleManager<IdentityRole> _roleManager;  
        private readonly UserManager<IdentityUser> _userManager;  
        public RoleController(RoleManager<IdentityRole> roleManager, UserManager<IdentityUser> userManager)  
        {  
            _roleManager = roleManager;  
            _userManager = userManager;  
        }

Then in the action simply invoke methods on the _roleManager.

        // POST: RoleController/Create  
        [HttpPost]  
        [ValidateAntiForgeryToken]  
        public async Task<ActionResult> Create(string Name)  
        {  
            try  
            {  
                if (!string.IsNullOrEmpty(Name))  
                {  
                    if (!(await _roleManager.RoleExistsAsync(Name)))  
                    {  
                        await _roleManager.CreateAsync(new IdentityRole(Name));  
                        return RedirectToAction("Index");  
                    }  
                }  
                return View();  
            }  
            catch  
            {  
                return View();  
            }  
        }

Create View

@model Microsoft.AspNetCore.Identity.IdentityRole  
@{  
    ViewData["Title"] = "Create";  
}  
  
<h1>Create</h1>  
<form method="post">  
    <input type="text" asp-for="Name" />  
    <input type="submit" name="submit" value="submit" />  
</form>

If you are trying to seed a role when the application starts the see the Data Seeding reference documentation to access the role and user manager services.

var app = builder.Build();  
  
using (var scope = app.Services.CreateScope())  
{  
    var roleManager = scope.ServiceProvider.GetRequiredService<RoleManager<IdentityRole>>();  
    var userManager = scope.ServiceProvider.GetRequiredService<UserManager<IdentityUser>>();  
  
    string role = "Manager";  
    if (!(await roleManager.RoleExistsAsync(role)))  
    {  
        await roleManager.CreateAsync(new IdentityRole(role));  
    }  
}

Answer 2

Bruce (SqlWork.com) 78,086 Volunteer Moderator

just add the call createRolesandUsers() anytime before app.Run(). while I'd use a separate file, the method definition can be added after app.Run();

Answer 3

So I added in Program.cs file the following function after app.Run()

void createRolesandUsers()  
{  
    ApplicationDbContext context = new ApplicationDbContext();  
  
    var roleManager = new RoleManager<IdentityRole>(new RoleStore<IdentityRole>(builder));  
    var UserManager = new UserManager<ApplicationUser>(new UserStore<ApplicationUser>(context));  
  
    if (!roleManager.RoleExistsAsync("Manager"))  
    {  
        var role = new Microsoft.AspNet.Identity.EntityFramework.IdentityRole();  
        role.Name = "Manager";  
        roleManager.Create(role);  
    }  
}

At the first line I get the error - There is no argument given that corresponds to the required parameter 'options' of
'ApplicationDbContext.ApplicationDbContext(DbContextOptions<ApplicationDbContext>)'

Whereas I have ApplicationDbContext defined as

public class ApplicationDbContext : IdentityDbContext<IdentityUser>  
{  
    public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options)  
        : base(options)  
    {  
    }  
  
    protected override void OnModelCreating(ModelBuilder builder)  
    {  
        base.OnModelCreating(builder);  
        // Customize the ASP.NET Identity model and override the defaults if needed.  
        // For example, you can rename the ASP.NET Identity table names and more.  
        // Add your customizations after calling base.OnModelCreating(builder);  
    }  
}

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Create Role using Identity Framework

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