Cannot consume scoped service Microsoft.AspNetCore.Identity.IRoleStore from singleton 'Microsoft.AspNetCore.Identity.RoleManager

Question: How do you inject RoleManager in Asp.Net 6 Dependency Injection Container, when I do am getting an error below "InvalidOperationException: Cannot consume scoped service 'Microsoft-AspNetCore-Identity-IRoleStore`1[Microsoft-AspNetCore-Identity-dentityRole]' from singleton 'Microsoft-AspNetCore.Identity-RoleManager`1[Microsoft-AspNetCore-Identity-IdentityRole]'."

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Answer: The problem here is that you are trying to inject an interface that Asp.Net Framework has already registered in the Dependency Injection. It is like injecting IConfiguration Interface into the DI, this interface already comes injected into DI. 

In order to resolve RoleManager Error in Asp.Net Core, you need to obtain the Service via ServiceProvider Interface and wrap it in a using block, see the code below:

  using (RoleManager<IdentityRole> roleManager =  _serviceProvider.GetRequiredService<RoleManager<Microsoft.AspNetCore.Identity.IdentityRole>>()
          )
            {
                foreach (string roleName in roleNames)
                {
                    try //This try and catch is only used on development to see the error
                    {
                        bool roleExist = await roleManager.RoleExistsAsync(roleName).ConfigureAwait(false);
                        if (!roleExist)
                        {
                            //create the roles and seed them to the database: Question 1
                            roleResult = await roleManager.CreateAsync(new IdentityRole(roleName)).ConfigureAwait(false);
                        }

                    }
                    catch (Exception ex) //Catch the error only in development
                    {


                    }

                }
            }

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