ln.application/ln.application.demo/DemoIdentityProvider.cs

using System;
using System.Collections.Generic;
using ln.identities;
using System.Linq;
namespace ln.application.demo
{
    public class DemoIdentityProvider : BaseIdentityProvider
    {
        Dictionary<Guid, Identity> identities = new Dictionary<Guid, Identity>();

        public DemoIdentityProvider()
        {
            Identity demoIdentity = new Identity(this,"demo");
            demoIdentity.AddSecureAttribute(new SeededPassword("demopass"));

            identities.Add(demoIdentity.UniqueID,demoIdentity);
        }

        public override Identity CreateIdentity(string identityName)
        {
            Identity identity = new Identity(this,identityName);
            identities.Add(identity.UniqueID, identity);
            return identity;
        }

        public override IEnumerable<KeyValuePair<Guid, string>> GetIdentities() => identities.Select((arg) => new KeyValuePair<Guid, string>(arg.Key,arg.Value.IdentityName));
        public override Identity GetIdentity(Guid uniqueID) => identities[uniqueID];

        public override IEnumerable<RoleAssignment> GetRoleAssignments(Identity identity)
        {
            List<RoleAssignment> roleAssignments = new List<RoleAssignment>();
            roleAssignments.Add(new RoleAssignment(this,identity, identity, Role.BE));

            return roleAssignments;
        }

        public override bool Save(Identity identity) => true;
    }
}