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TaskCompletionSource

Posted: Nov 12, 2009 at 9:06 AM
By: Phil Pennington
Avg Rating: 5

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Join Danny Shih as he introduces the TaskCompletionSource<TResult> type. He’ll cover basic usage and walk through a full scenario

Learn more about the .NET Framework 4 and keep abreast of Parallel Computing tools and techniques via the Concurrency Dev Center.

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Flynn0r Passionate about code

Nov 13, 2009 at 12:56 PM

Very nice, thank you
cgillum

Nov 14, 2009 at 6:33 AM

Perhaps I need to do more research on the new Task APIs, but I didn't quite understand why we would use a TaskCompletionSource<T> instead of using the EAP functionality directly. Is it because the Task APIs give us better tooling/functionality than EAP?
Toub

Nov 14, 2009 at 10:08 AM

Hi cgillum-

This was just an example Danny was providing on how TCS<T> could be used to represent any asynchronous operation, including EAP implementations. However, the compositionality provided by Task<T> now allows you to start doing some really useful things. For example, if you wanted to download a bunch of web pages asynchronously and then only do something when all of them were complete, with WebClient by itself you'd have to code up that logic manually; in contrast, if you had a Task<T> for each download, you could then use ContinueWhenAll to launch additional work when all of those downloads completed (and you'd get back a Task that represents that continuation). In short, once you have a Task<T> to represent the EAP operation, you can compose it with any other tasks you might have, and you have the full functionality afforded to tasks to process that EAP operation.

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