public void Reject( 
   System.Exception ex,
   System.bool notifyImmediately,
   System.int delay
)

Parameters

ex

notifyImmediately

delay

optional delay after which the handlers are notified on the UI thread.

Target Platforms: Windows 11, Windows 10, Windows 7, Windows Server 2019, Windows Server 2016, Windows Server 2012 R2, Windows Server 2012, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later)

Reference

NPromise<TResult> Class
NPromise<TResult> Members
Overload List