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Lesson 16 - E-shop in ASP.NET Core MVC - Persons - ViewModels

In the previous lesson, E-shop in ASP.NET Core MVC - Persons - Designing entities, we prepared person entities. In today's ASP.NET Core MVC tutorial, we're going to prepare the viewmodels we need for editing those entities and have a look at how to write a custom annotation.

Application layer

All data for the prepared entities will be filled in by the user when registering, editing their profile or purchasing without registration. Because the forms are going to look very similar, let's create a partial base view for them. The viewmodels will be similar as well; we can create a base class and inherit the individual viewmodels from it.

The form for shopping without an account and the register form are basically the same. Both have to include fields for the properties of the PersonDetail entity, and the fields for the Address entity properties will be included even twice (the billing and shipping addresses may be different). Both forms will also contain fields for entering and confirming a password needed to create the User entity. These fields will be optional only when shopping without an account. When editing the profile, fields for defining bank information will be included as well.

The interesting thing will be using custom annotations in situations where those in the basic libraries aren't enough. For extended validation using custom rules, we can either use NuGet packages (such as FluentValidati­on), or we can write the validation attributes by ourselves. Since you can surely already work with NuGet at this point, let's create our own annotations using a little bit of reflection (that's when the program inspects itself in the runtime) :-) They will be relatively simple, but you're going to like this new approach and programming possibilities for sure :)


The base viewmodel with all common properties could look like this (notice the SelectList that fills the dropdowns with the stored states):


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In this ASP.NET Core tutorial, we'll add viewmodels for person editing forms. The viewmodels will have advanced annotations, including our custom ones.

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Article has been written for you by Martin Petrovaj