As we’ll see in a moment, in fact, the biggest benefit of using HttpClient and async/ await is particularly apparent when it comes to manage and coordinate multiple pending requests.Īs a side note, consider also that HttpClient is not limited to async/await.
#Aasync xmlreader code#
NET Framework 4.5 this class exists specifically to support asynchronous code through await/ async and the related new Task-oriented pattern. The signature of an async method looks like the following:īesides the internal helper methods to manipulate RSS, the core of the code revolves around the role of the new HttpClient class. The other keyword, async, is used mostly to identify a method that is making use internally of async functionality. Of the two keywords, await is the most important in the sense that it is the marker that compilers look for and transform into “classic” async patterns just like the ones you have had to implement yourself up until. Or, from another perspective, it makes asynchronously-working code as easy to read and understand as if it was written to run synchronously. The most characteristic aspect of async and await keywords is the fact that their use makes apparently synchronous code work asynchronously. The use of these two new keywords in combination radically simplifies the writing of asynchronous code. NET languages, C# and Visual Basic, now feature a couple of new keywords: async and await. This async pill was given enough sugar only in the latest. What developers really wanted, but never loudly demanded, was a spoonful of syntactic sugar to help the medicine go down. We also had several scattered general purpose APIs to deal more effectively with tasks and their combination. NET Framework 2.0 and then async controllers in ASP.NET MVC 2. So we first had Async Web Forms page in the.
NET Framework has always had support for async operation: However, Microsoft devoted much time to trying to make async more digestible to developers. When implementing a chain of async operations, it is difficult to avoid writing code that is an intricate mess of nested calls and lambdas, not much different from the classic and notorious spaghetti code. In this case, there’s a stronger business case for coding the logic asynchronously. It’s a different story when results of multiple network (or file-based) operations are to be retrieved and then combined together through the steps of a workflow. At any rate, coding a single operation with an async pattern doesn’t significantly raise the level of complexity of your code. The chances are that the request will complete in just a few milliseconds. It’s a single operation and, probably, you’re also having a caching layer around results.
#Aasync xmlreader download#
If your web site needs to download an RSS feed, for example, it will not make any significant difference to performance whether the operation is coded synchronously or asynchronously.
I don’t think that any developers would have ever bothered writing a method asynchronously if that method was the only call of a procedure. Why? The reason is obvious: writing asynchronous code is boring, annoying and error prone.įor the most part, when working with asynchronous code, the developer is forced to focus on the technical details of the implementation rather than the workflow they’re setting up.
#Aasync xmlreader software#
Any developers would agree that asynchronous software is important yet will do whatever he can to avoid writing async methods. If you have read my article “ Go Async or Sink“, then you should already be convinced that asynchrony is essential for providing scalability and actual performance for any modern (server-side) software. Syntactic Sugar and the Async Pill - Simple Talk Skip to content
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