Lesson 6 - E-shop in ASP.NET Core MVC - Flash messages for users

In the previous lesson, E-shop in ASP.NET Core MVC - User management, we prepared registration and user login. In today's tutorial, we're going to use ASP.NET Core to make a system displaying messages to our users. We'll also handle exceptions globally using filters.

FlashMessage class

Because we should only use messages in the application layer, let's add the necessary classes to the MVC project. We'll create a Classes folder for them and add a new FlashMessage class in it. We'll distinguish the messages by type visually (information, success, warning, and error). First, we'll create a list of all the message types as an enum:

public enum FlashMessageType
{
    Info,
    Success,
    Warning,
    Danger,
}

It's probably not a problem to have the enumerated type and the class itself in one file, of course you can separate these as well. The FlashMesage class will be very simple:

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