C# Under the Hood: async/await

Async and await keywords came with C# 5 as a cool new feature for handling asynchronous tasks. They allow us to specify tasks to be executed asynchronously in an easy and straightforward fashion. However, some people are mystified by asynchronous programming and are not sure how it actually works. I will try to give you an insight of the magic that happens under the hood when async and await are used. Awaiter Pattern C# language compiles some of the features as a syntactic sugar, which means that certain language features are just conveniences that translate into existing language features. A lot of those syntactic sugar features expand into patterns. Those patterns are based on method calls, property lookups or interface implementations. await expression is one of those syntactic sugar features. It leverages a pattern based on a few method calls. In order for a type to be awaitable, it has to meet the following requirements: It has to have the following method: INotifyCompletion GetAwaiter() Besides implementing the INotifyCompletion interface, the return type of the GetAwaiter method has to have the following: IsCompleted property of type bool GetResult() method which returns void If you take a look at Task class, you will see that it meets all the above requirements.

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async-await,c#,asynchronous