By Alex Davies
If you are writing one of many functions that decision for asynchronous programming, this concise hands-on advisor exhibits you ways the async function in C# 5.0 could make the method a lot easier. in addition to a transparent advent to asynchronous programming, you get an in-depth examine how the async characteristic works and why you have to use it on your program. Written for skilled C# programmers - but approachable for newcomers - this publication is choked with code examples so that you can expand to your personal tasks.
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Additional info for Async in C# 5.0: Unleash the Power of Async
WhenAny. Here is a generic version. Again, there are lots of overloads, but this one is interesting. Task
They start running synchronously, until they call an asynchronous method and await it. When they do so, they necessarily become asynchronous themselves. Sometimes, an async method never awaits anything, in which case it runs synchronously. Add(imageControl); } Compare this to the other two versions of this code we’ve looked at. It looks much more like the original synchronous version of the code. There’s no extra method, just a little extra code in the same structure. However, it behaves much more like the asynchronous version that we wrote in “Converting the Example to Use Manual Asynchronous Code” on page 17.
Async Methods Are Synchronous Until Needed I said before that async methods are only asynchronous if they consume an asynchronous method with an await. Until that happens, they run in the thread that called them, just the same as a normal synchronous method. This sometimes has very real implications, especially when it’s possible for an entire chain of async methods to complete synchronously. Remember that the async method only pauses when it reaches the first await. Even then, it sometimes doesn’t need to, because sometimes the Task given to an await is already complete.