Get Async in C# 5.0: Unleash the Power of Async PDF
By Alex Davies
In case you are writing among the functions that decision for asynchronous programming, this concise hands-on advisor exhibits you the way the async function in C# 5.0 could make the method a lot easier. besides a transparent advent to asynchronous programming, you get an in-depth examine how the async function works and why you have to use it on your program. Written for skilled C# programmers - but approachable for newbies - this ebook is jam-packed with code examples that you should expand on your personal initiatives.
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Additional resources for Async in C# 5.0: Unleash the Power of Async
That was pretty complicated, but I think it’s worth seeing each step spelled out. Notice that every single line of my code was executed by the UI thread. The IO completion port thread only ran long enough to Post an instruction to the UI thread, which ran the second half of both my methods. Choosing Not to Use SynchronizationContext Each implementation of SynchronizationContext performs Post in a different way. Most of them are relatively expensive. NET will not use a Post when the captured SynchronizationContext is the same as the current at the time of the Task’s completion.
Let’s look at the body of the method. Task; Notice that the method isn’t marked async; we’re creating a Task manually, so we don’t want the compiler to generate one for us. The TaskCompletionSource
I know that the delay can never throw an exception, so I don’t need to deal with it. Exception); } } Obviously, exactly what to do here depends on your strategy for handling exceptions. By attaching this using ContinueWith, I’ve made sure that whenever the original Task does finish, however far in the future that may be, the code to check for an exception is run. Importantly, this doesn’t hold up the main execution of the program, which already did whatever it needed to do when the timeout expired.
Async in C# 5.0: Unleash the Power of Async by Alex Davies