Injecting DbContext into service layer
<p>How am I supposed to inject my <code>MyDbContext</code> into my database service layer <code>MyService</code>?</p>

<p><strong>Startup.cs</strong></p>

<pre><code>public void ConfigureServices(IServiceCollection services)
{
    services.AddDbContext&lt;MyDbContext&gt;(options =&gt;
    options.UseSqlServer(Configuration["ConnectionStrings:DefaultConnection"]));
    services.AddMvc();
}
</code></pre>

<p><strong>MyDbContext.cs</strong></p>

<pre><code>public partial class MyDbContext : DbContext
{
    public virtual DbSet&lt;User&gt; User { get; set; }

    public MyDbContext(DbContextOptions&lt;MyDbContext&gt; options)
    :base(options)
    {
    }
}
</code></pre>

<p><strong>appsettings.json</strong></p>

<pre><code>{
  "Logging": {
    "IncludeScopes": false,
    "LogLevel": {
      "Default": "Debug",
      "System": "Information",
      "Microsoft": "Information"
    }
  },
  "ConnectionStrings": {
    "DefaultConnection": "Server=MyServer;Database=MyDatabase;user id=MyUser;password=MyPassword;"
  }
}
</code></pre>

<p><strong>MyService.cs</strong></p>

<pre><code>public class MyService
{
    public User GetUser(string username)
    {
        // Should i remove this call and get the reference from the injection somehow?
        MyDbContext db_context = new MyDbContext(optionsBuilder.Options);
        using (db_context)
        {
            var users = from u in db_context.User where u.WindowsLogin == username select u;
            if (users.Count() == 1)
            {
                return users.First();
            }
            return null;
        }
    }
}
</code></pre>

<p>In my <code>GetUser</code> method, I know I am supposed to be using my injected <code>MyDbContext</code> here but I am not quite sure how to fetch it. Which piece of the puzzle am I missing?</p>