public LongpollGroupUpdateEventHandler(GroupUpdateType eventType, Func <T, Action, Task> handler) : base(handler)
{
this.eventType = eventType;
eventFieldName = typeof(GroupUpdateType)
.GetFields()
.Where(prop => prop.GetValue(null).ToString() == eventType.ToString())
.Select(prop => prop?.Name)
.FirstOrDefault();
}
