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The BasePlayer class represents a SA-MP player. This class contains the methods, properties and events related to players.

public class GameMode : BaseMode
{
    // ...
    protected override void OnPlayerConnected(BasePlayer player, EventArgs e)
    {
        // Always call the base event invocator so the event can propagate.
        base.OnPlayerConnected(player, e);

        player.Money = 1000000;
        player.SendClientMessage($"Welcome, {player.Name}! You are now a millionaire!");
    }
}

In order to allow you to store additional data for the player, SampSharp allows you to create a subclass of the BasePlayer class. In your subclass you can create properties, fields and methods for storing and consuming your data. Because you're likely to create a subclass of the player class, SampSharp has conveniently called it BasePlayer instead of Player to avoid confusion in your code.

public class Player : BasePlayer
{
    public bool IsCop { get; set; }
    // ...
}

It is usually a necesity to store your players in a database, so they can register an account, log in etc. For this, you'll most likely opt to use an ORM, such as Entity Framework/EF Core, Dapper, NHibernate etc. to map your local classes to the tables in your database.

In order to use Entity Framework Core as your ORM, you will have to install it. Follow the steps provided in the official EF Core Documentation in order to install EF Core. After you've installed Entity Framework Core, you will have to add a Context.

Note: We recommend creating a different project inside your solution for database logic, in order to reuse it in things like a UCP Website or a mobile app if needed.

After you've created your context (named ServerDbContext in the rest of the tutorial), create a class that will represent what information about your player you want stored in the database (named PlayerData in this tutorial).

Sample PlayerData:

public class PlayerData
{
    public int Id { get; set; }
    public string UserName { get; set; }
    public string PasswordHash { get; set; }
    public int PhoneNumber { get; set; }
    //etc.
}

Sample context:

public class ServerDbContext : DbContext
{
    public DbSet<PlayerData> Players { get; set; }
    
    protected override void OnConfiguring (DbContextOptionsBuilder optionsBuilder)
    { // Configure your connection
            base.OnConfiguring(optionsBuilder);
            optionsBuilder.UseSqlServer("Server=(localdb)\\mssqllocaldb;Database=mydatabase;Trusted_Connection=True;");
            // This is a sample using Microsoft SQL Server. For MySQL, install a provider and use UseMySql instead of SqlServer.
    }
}

Afterwards, in your custom subclass of the BasePlayer class (named Player), add a field for a link with an instance of PlayerData

public class Player : BasePlayer
{
    public PlayerData PlayerData { get; set; }
    // ...
}

Once your user logs in, you can set this value to the PlayerData instance returned by querying your database for your user's details and then you can proceed to use this in your gamemode.