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Sometimes incremental results can be made available while progress is reported As an example, when downloading a file over the Web, we might want to allow incremental rendering, such as what Web browsers do To do this, P rogre s s C h a nged E v e ntArgs is subclassed to contain relevant API spe cific state, much like subclassing Asy n c Co m p l et e d E ve n tArg s When this is done, it's almost always useful to have separate progress change event han dlers per each unique asynchronous operation because they are apt to offer different incremental state
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Where the EAP Is Used in the N ET Framework The event-based pattern, much like the APM, can also be found imple mented in various places throughout the NET Framework Here is a list of some examples
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System Compo n e n tMod e l B a c k g r o u n d Wo r k e r implements the pattern
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in a reusable way, making it easier to write responsive GUIs This includes cancellation support We'll review this type in detail in 1 6, Graphical User Interfaces
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The System Net WebC l i e n t component provides a plethora of asynchronous operations, in addition to cancellation support This internally uses the APM support provided by the network classes and includes the ability to download and upload data asynchro nously with Down loadDat aAsy n c , Down l o a d F i l eAsyn c , Down l oa d
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St r i n gAsyn c , Ope n Re a dAsyn c , OpenWr iteAsy n c , U p l o a dDat aAsy n c , Up loa d F i leAsyn c , u p loadSt r i n gAsyn c, and u p l o a dva l u e sAsy n c
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The System Med i a Sou n d P l ay e r component i n the System d l l assembly allows you t o load sound files asynchronously with its LoadAsy n c method It also allows playing the loaded files with P l ayAsy n c Both exist so as not to interfere with the GUI thread while doing I /O
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The System wi n dows Do c ument s Do c u me n t p a g i n a t o r component
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allows you to paginate XPS documents, which may entail loading data off disk and performing compute intensive work to compute pagination boundaries It supports Comput e P a geCountAsy n c and GetPa geAsy n c methods, and also fully supports cancellation with a C a n c e lAsy n c method Similarly, the serialization of XPS documents also supports asynchronous operations
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We've now taken a look at the two most prevalent asynchronous program ming model patterns in the NET Framework: the APM and event-based pattern We've seen how programs can be written to take advantage of them, most notably how to orchestrate work to be performed when asyn chronous operations finish You'll notice that most components that implement the event-based pat tern are meant to be used more with client GUI applications, while those that implement the APM tend to target lower level frameworks and server side applications This is consistent with the advice at the opening of this chapter with respect to how to choose one over the other if you are writing a reusable library of your own
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C h a pter 8: Asyn c h ro n o u s Prolra m m l n l M o d e l s
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Next, we will wrap up our discussion of Windows concurrency mech anisms by looking at another way to schedule work: fibers
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FU RTH ER READ I N G
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K Cwalina, B Abrams Framework Design Guidelines: Conventions, Idioms, and
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Patterns for Reusable NET Libraries (Addison-Wesley, 2006)
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J Duffy Implementing a High-perf IAsyncResult: Lock free Lazy Allocation Weblog article, http: / / wwwbluebytesoftwarecom/blog/ 2006 / 05 / 3 1 / ImplementingAHighperfIAsyncResultLockfreeLazy Alloca tionaspx (2006) Microsoft NET Framework Developer's Guide: Multithreaded Programming with the Event-based Asynchronous Pattern MSDN whitepaper, http: / / msdnmicrosoft com / en-us / library / hkasytyfaspx J Prosise 2005 Wicked Code: Asynchronous Pages in ASPNET 20 MSDN
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Magazine (2005)
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