// async public static Task CreateJoinRoomAsync(this ILoginClient client, string roomId) { return(client.CreateJoinRoomAsync(roomId, CancellationToken.None)); }
// nonasync public static void CreateJoinRoom(this ILoginClient client, string roomId) { client.CreateJoinRoomAsync(roomId).WaitEx(); }
// nonasync ct public static void CreateJoinRoom(this ILoginClient client, string roomId, CancellationToken ct) { client.CreateJoinRoomAsync(roomId, ct).WaitEx(); }