Stage 1 · Lesson 6 of 10
async/await and Tasks
serves many requests with a small pool of . That only works if your code slow work instead of blocking a thread while it waits. An async method returns a Task (or Task<T>), a promise of a result.
await pauses the method while the database or call is in progress. Meanwhile it gives the thread back to serve someone else. Task.WhenAll runs independent calls at the same time. Pass a CancellationToken through your calls, so work stops when the client disconnects.
Common trapsync-over-async: calling .Result or .Wait() on a task blocks a thread while it waits. Under load the pool runs dry, requests queue and the service stalls, even though the CPU is idle. Once you go async, stay async all the way up.
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Resources for this stage
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- GuideFreeLearn C#
Microsoft · Beginner
Official C# tutorials from the language basics through classes, LINQ and async
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