Stopping the player

To stop the player, we can use the StopAsync method. This method will stop the player and clear the queue.

[SlashCommand("stop", description: "Stops the current track", runMode: RunMode.Async)]
public async Task Stop()
{
    // Retrieve the player using the method we created earlier.
    // We do not allow to connect to the voice channel if the user is not connected.
    // It would not make sense to connect the player to the voice channel, only to stop it.
    var player = await GetPlayerAsync(connectToVoiceChannel: false);

    if (player is null)
    {
        // We already sent an error message to the user
        return;
    }

    // Check if the player is playing
    if (player.CurrentTrack is null)
    {
        // If the player is not playing, we send an error message to the user
        await RespondAsync("Nothing playing!").ConfigureAwait(false);
        return;
    }

    // Stop the player and send a message to the user
    await player.StopAsync().ConfigureAwait(false);
    await RespondAsync("Stopped playing.").ConfigureAwait(false);
}

info

Later when you got to know Lavalink4NET better, you would use player preconditions to determine the player state. For now, we will use the CurrentTrack property to check if the player is playing.