How to use sessions?

Session data is the user data in every separate chat.

Session is an EF-Entity with shared primary key - UserID and ChatID.

There is a recommended way to use sessions via built-in Listener async methods GetSession(Message | CallbackQuery) and SaveChanges().

But you can sure use session natively for more complex operations as a EntityFramework Core Database.

Built-in Way (Recommended where possible)

1. In your listener/command Handler()/Run()/RunAsync() method initialize a Session variable and pass Message or CallbackQuery:

        public override async Task Handler(Context context, CancellationToken cancellationToken)
        {
            var session = await GetSession(context.Update.Message);
        }

1. Get all values you want from session:

        public override async Task Handler(Context context, CancellationToken cancellationToken)
        {
            var session = await GetSession(context.Update.Message);
            Console.WriteLine(session.Name);
        }

1. Change all values you want:

        public override async Task Handler(Context context, CancellationToken cancellationToken)
        {
            var session = await GetSession(context.Update.Message);
            Console.WriteLine(session.Name);
            session.Name = "[VIP] " + session.Name;
        }

1. Save your changes with SaveChanges() method:

        public override async Task Handler(Context context, CancellationToken cancellationToken)
        {
            var session = await GetSession(context.Update.Message);
            Console.WriteLine(session.Name);
            session.Name = "[VIP] " + session.Name;
            await SaveChanges();
        }

1. Complete! Now you can start your bot and test your new session-ful business logic.

Entity Framework Way

1. In any place of your code get database context:

SessionContext db = Database.GetConnection().SessionContext;

1. Then you can perform some Entity Framework Core operations:

using (SessionContext db = Database.GetConnection().SessionContext) 
{
       session = await db.FindAsync<Session>(
                    message.Chat.Id,
                    userId
                );
}

1. Complete! Now you can start your bot and test your new session-ful business logic.