R u nWo r k e rAs y n c You will need to specifically have code to prevent this in .NET framework

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R u nWo r k e rAs y n c You will need to specifically have code to prevent this
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from happening, such as disabling any buttons meant to initiate asynchro nous work while an outstanding request is running, or by generating multiple B a c kgrou n dWo r k e r s and tracking them in a list of some sort Each of the events has its own E v e n t H a n d l e r type, each with its own
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Eve ntArgs class
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I I DoWork event public delegate void DoWorkEventHand l e r ( obj e c t s e n d e r , DoWork EventArgs e ); p u b l i c c l a s s C a n c e l EventArgs : Eve ntArgs { p u b l i c C a n c e l EventArg s ( ) ; p u b l i c C a n c e l Eve ntArg s ( bool c a n c e l ) ; p u b l i c bool C a n c e l { get ; set ; }
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p u b l i c c l a s s DoWo r k E v e ntArgs : C a n c e l Eve ntArgs { p u b l i c DoWo r k E v e ntArg s ( ob j e c t a rgument ) ; p u b l i c obj ect Argument { get ; } p u b l i c obj ect R e s u lt { get ; set ;
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II Progre s s C h a nged event p u b l i c d e l egate void Progre s sC h a nged Event H a nd l e r ( object sende r , Progre s s C h a nged EventArgs e ); p u b l i c c l a s s Progre s s C h a nged EventArgs { p u b l i c P rogre s sC h a nged EventArg s ( i n t p rogre s s Perc entage , obj ect u s e rState ); p u b l i c int Progre s s Perc entage { get ; } p u b l i c object U s e rState { get ; } Eve ntArgs
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II R u nWorkerCompleted event public de legate Ru nWo r k e rCompleted Event H a n d le r ( object sender, R u nWorkerCompletedEventArgs e );
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p u b l i c c l a s s R u nWo r k e rCom p l eted EventArgs : AsyncCompleted EventArgs { p u b l i c R u nWor k e rCom p l et e d E ve ntArg s ( obj ect r e s u l t , E x c eption e r r o r , bool c a n c e l led ); p u b l i c o b j e c t R e s u lt { get ; } p u b l i c obj ect U s e rState { get ; }
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Let's review each briefly in turn DoWo r k E v e ntArgs derives from C a n c e l E v e ntArgs and adds R e s u lt and C a n c e l properties R e s u lt is used to marshal any kind of result from the background work back to the CUI thread The C a n c e l flag's purpose is to let the completion handler know the work quit voluntarily in response to seeing a C a n c e l l a t i o n P e n d i n g of t r u e due to a C a n c e lAsy n c call The R u n Wo r k e rCom p l et e d E v e ntArgs object passed to the completion handler copies the Re s u lt (if any) and the C a n c e l l e d flag-inherited from Asy n c Comp l et e d E v e ntArgs-based on the DoWo r k E v e ntArgs object's properties that were set by the callback P ro g r e s s C h a n g e d E v e n t A r g s is straightforward and marshals the input passed to R e p o rt P rog r e s s to the CUI thread so it can update what ever state is appropriate, often involving things such as a progress bar control Finally, R u nWo r k e rCom p l et e d E v e ntArgs offers E r r o r and U s e rSt ate properties in addition to the R e s u lt and C a n c e l properties mentioned already If the DoWo r k code throws an unhand led exception, it will be caught and stored in the E r ror property
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