private static async IAsyncEnumerable <ApplicationRole> GetOrCreateRoles(this AppRoleManager manager, params string[] roleNames)
{
foreach (var roleName in roleNames)
{
var role = new ApplicationRole(roleName)
{
Id = GuidUtilities.Create($"role_{roleName}").ToString()
};
await manager.TryCreateByNameAsync(role).ConfigureAwait(false);
yield return(role);
}
}
