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p u b l i c c l a s s D i s p a t c herOperation { II Met hods public bool Abort ( ) ; p u b l i c D i s p a t c h e rOperationSt at u s Wait ( ) ; p u b l i c D i s p a t c h e rOperationStat u s Wait ( TimeS p a n t imeout ) ; I I Propert i e s p u b l i c D i s p a t c h e r D i s p a t c h e r { get ; } p u b l i c D i s p a t c herP riority P riority { get ; } p u b l i c object Result { get ; } p u b l i c D i spat c herOpe rationSt a t u s Stat u s { get ; } II Events public event Event H a n d l e r Aborted ; p u b l i c event EventHa n d l e r Completed ;
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Using this class, you can Abo rt the operation, which prevents it from running if it has not yet been started It returns t r u e to indicate success, or fa l s e if the operation already began Other priorities allow you to query about certain aspects of the operation For example, D i s p at c h e r and P r i o r i ty retrieve information about how it was created The most commonly used aspect of the D i s p a t c h e rOpe r a t i o n class is the W a i t method It waits for the operation to finish running and then returns This is how the synchronous I n voke method is implemented inter nally and, as you can see, there is an overload that accepts a T i m e S p a n timeout Both overloads return a D i s p at c h e rO p e r a t i o n St a t u s enum value indicating the current status of the operation The St a t u s property also allows you to query the current status anytime without needing to wait
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p u b l i c enum D i s p a t c herOperat ionSt at u s { Pend i n g , Abort ed , Comp leted , Executing }
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The Pe n d i n g status means that the operation has been placed into the dispatcher 's queue, but has not yet begun running E x e c u t i ng, on the other
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hand, means that it is actively running The two final states, A b o r t e d and Completed, indicate whether the operation was aborted before running or whether it has finished successfully, respectively D i s p a t c h e rO p e r a t i o n also provides A b o r t e d and C o m p l e t e d event handlers As you might imagine, these are fired when the respective com pletion occurs No guarantees are made about where specifically they are run A b o r t , for example, runs them synchronously before returning, which may or may not be on the CUI thread itself There is one last thing to do with Beg i n I n vo k e and I n v ok e that we skipped You can specify a D i s p at c h e r P r i o r i ty for any work item, which allows you to rank items among each other The D i s p at c h e r internally maintains a priority queue data structure containing all of the callbacks that must be run at any given time When selecting the next callback to dispatch, it will prefer those with higher priority
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