public int CompareTo(object obj)
{
Call anotherCall = obj as Call;
if (anotherCall == null)
{
throw new InvalidOperationException($"{nameof(anotherCall)} must not be null");
}
if (CallTime.Count == 0 || anotherCall?.CallTime.Count == 0)
{
throw new InvalidOperationException($"{nameof(CallTime)} must not be empty");
}
return(CallTime.Last().Time.CompareTo(anotherCall.CallTime.Last().Time));
}
public Call(Contact contact, string number, DateTime time, bool isIncoming)
{
this.contact = contact;
CallTime.Add(new CallTime(number, time));
IsIncoming = isIncoming;
}