public async Task <string> CreateAsync(ScopeParam model) { if (model == null) { throw new ArgumentNullException(nameof(model)); } var entity = await _manager.FindByNameAsync(model.Name); if (entity == null) { // create new entity var newEntity = new OpenIddictEntityFrameworkCoreScope { Name = model.Name, DisplayName = model.DisplayName, Description = model.Description }; HandleCustomProperties(model, newEntity); await _manager.CreateAsync(newEntity); return(newEntity.Id); } // update existing entity model.Id = entity.Id; await UpdateAsync(model); return(entity.Id); }