By Alex Davies

ISBN-10: 1449337163

ISBN-13: 9781449337162

If you’re writing one of many purposes that decision for asynchronous programming, this concise hands-on consultant exhibits you the way the async characteristic in C# 5.0 could make the method a lot easier. besides a transparent creation to asynchronous programming, you get an in-depth examine how the async characteristic works and why you should use it on your application.

Written for knowledgeable C# programmers—yet approachable for beginners—this booklet is filled with code examples that you should expand on your personal projects.

  • Write your individual asynchronous code, and learn the way async saves you from this messy chore
  • Discover new functionality probabilities in ASP.NET internet server code
  • Explore how async and WinRT interact in home windows eight functions
  • Learn the significance of the anticipate key-phrase in async equipment
  • Understand which .NET thread is operating your code—and at what issues within the application
  • Use the Task-based Asynchronous development (TAP) to write down asynchronous APIs in .NET
  • Take good thing about parallel computing in smooth machines
  • Measure async code functionality by means of evaluating it with choices

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Additional info for Async in C# 5.0

Example text

You can make the Task complete at any point you like, and you can make it fault by giving it an exception at any point you like. Let’s look at an example. Suppose you’d like to encapsulate a prompt displayed to the user with this method: Task GetUserPermission() The prompt is a custom dialog you’ve written that asks the user for consent of some kind. Because the permission could be needed at many points in your application, it’s important to make it one easy method to call. This is a perfect place to use an asynchronous method, because you want to release the UI thread to actually display the Creating a Puppet Task | 35 dialog.

We can just start multiple operations, keeping all the Tasks, then await them all afterwards. com"); string firstPage = await firstTask; string secondPage = await secondTask; This is a dangerous way to await multiple Tasks, if they may throw exceptions. If both operations throw an exception, the first await will propagate its exception, which means secondTask is never awaited. NET version and settings, may be lost or even rethrown on an unexpected thread, terminating the process. We’ll see better ways to do this in Chapter 7.

For example, a method that cached its results in memory could return synchronously when the result is available from the cache, but asynchronously when it needs to make a network request. You may also want to make methods return Task or Task to future-proof a codebase, when you know there’s a good chance you’d like to make those methods asynchronous at some point down the line. NET using Task. The document by Stephen Toub from the parallel programming team at Microsoft has good examples and is worth a read.

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Async in C# 5.0 by Alex Davies


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