sbox-public/game/addons/menu/Code/MenuUI/LiveLobbies/LiveLobbies.razor

@inherits Sandbox.UI.Panel
@using Sandbox;
@using Sandbox.UI;
@namespace Menu

@if (all.Count == 0)
	return;

<root>

	<h2>Live Games</h2>

	<div class="lobby-list">
    @foreach (var l in all.GroupBy( x => x.Game ).Take( 10 ).Select( x => x.OrderByDescending( x => x.Members ).First() ) )
    {
		<LiveLobbyCard Lobby="@l"></LiveLobbyCard>
    }
	</div>

</root>

@code
{
	List<Sandbox.Network.LobbyInformation> all = new();
	RealTimeSince timeSinceUpdate = 0;

	override protected void OnParametersSet()
	{
		base.OnParametersSet();

		timeSinceUpdate = 0;
		_ = RefreshLobbies();
	}

	override public void Tick()
	{
		base.Tick();

		if ( timeSinceUpdate > 5 )
		{
			timeSinceUpdate = 0;
			_ = RefreshLobbies();
		}
	}

	async Task RefreshLobbies()
	{
		var filters = new Dictionary<string, string>();
        var lobbies = await Networking.QueryLobbies(filters, false);

        foreach( var l in lobbies )
        {
            var i = all.FindIndex(x => x.LobbyId == l.LobbyId);

            if (i >= 0)
            {
                all[i] = l;
                continue;
            }            

            all.Insert( 0, l);
        }

        foreach (var l in all.ToArray() )
        {
            if (lobbies.Any(x => x.LobbyId == l.LobbyId))
                continue;

            all.RemoveAll( x => x.LobbyId == l.LobbyId );
        }

        StateHasChanged();
    }
}