public Task BindModelAsync(ModelBindingContext bindingContext) { if (bindingContext == null) { throw new ArgumentNullException(nameof(bindingContext)); } var base64Id = (string)bindingContext.HttpContext.GetRouteValue("id"); if (GuidConverter.TryConvertBase64ToGuid(base64Id, out Guid id)) { bindingContext.Result = ModelBindingResult.Success(new PersonViewModel { Id = id, FirstName = "Bob", LastName = "Smith", Age = 23 }); } return(Task.CompletedTask); }