c# - Task.Factory.StartNew() Taskscheduler parameter -

see: taskfactory

when want make task long-running , cancellable, if calling method ui, how pass taskscheduler parameter?

it's not obvious problem is. why can't call:

cancellationtoken token = new cancellationtoken(false); taskscheduler scheduler = taskscheduler.default; task task = taskfactory.startnew(action, token,                                   taskcreationoptions.longrunning, scheduler);