private async static void CheckNewInvitation()
{
int myid = Constants.me.userid;
List <GroupTask> newinvitations = await Communications.GetNewTaskInvite(myid);
await Communications.ClearTaskInvite(myid);
foreach (GroupTask bt in newinvitations)
{
FriendTask task = new FriendTask(bt);
if (!Constants.displayedAlertNum.Contains(bt.taskid))
{
string taskowner = Constants.Friend.getNameOf(bt.creatorid);
string baseString = "Your friend {0} has invited you to join his/her task group:\n" +
"{1}\n Please check your task page to see it.";
string inviteString = string.Format(baseString, taskowner, task.taskname);
Constants.mainPage.DisplayInvitation(inviteString);
Console.WriteLine(bt.frequency);
Constants.displayedAlertNum.Add(bt.taskid);
}
if (!Constants.FriendTasks.Exists((obj) => obj.taskid == bt.taskid))
{
Constants.MyTask.Add(bt);
Constants.mainPage.DisplayMyTask(bt);
Constants.FriendTasks.Add(task);
Constants.mainPage.DisplayFriendTask(task);
}
}
}