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async/await Tips

There’s been some really good guidance about async / await in the past week or two. I’ve been tinkering away at this post for a while now—based on presentations I’ve been doing, discussions I’ve had with folks at Microsoft, etc. Now seems like a good idea to post it. First, it’s important...

Posted to Peter Ritchie's MVP Blog by PeterRitchie on Wed, Feb 13 2013
Filed under: Filed under: C#, C# 5, .NET 4.5, Visual Studio 2012, async
What’s New In C# 5.0 Session Materials From Rumos InsideOut Event

Here are the materials from my What’s New In C# 5.0 session at the Rumos InsideOut Event . Slide deck: What's New In C# 5.0 from Paulo Morgado Sample code: C# 5.0 Async/Await Demo Code

Posted to Paulo Morgado by Paulo Morgado on Sun, Oct 7 2012
Filed under: Filed under: .NET, WinForms, C#, WPF, async, .NET4.5, C#5.0, ASP.NET Web API
C# 5.0 Async/Await Demo Code

I’ve published the sample code I use to demonstrate the use of async / await in C# 5.0. You can find it here . Projects PauloMorgado.AyncDemo.WebServer This project is a simple web server implemented as a console application using Microsoft ASP.NET Web API self hosting and serves an image (with a delay...

Posted to Paulo Morgado by Paulo Morgado on Sun, Oct 7 2012
Filed under: Filed under: .NET, WinForms, ASP.NET, C#, WPF, CodeProject, async, .NET4.5, C#5.0, ASP.NET Web API
Eduasync 20: Changes between the VS11 Preview and the Visual Studio 11 Beta

A while I ago I blogged about what had changed under the hood of async between the CTP and the VS11 Preview. Well, now that the VS11 Beta is out, it's time to do it all again... Note that the code in this post is in the Eduasync codebase , under a different solution (Eduasync VS11.sln). Many of the...

Posted to Jon Skeet: Coding Blog by skeet on Tue, Mar 6 2012
Filed under: Filed under: C#, C# 5, async, Eduasync
Eduasync part 19: ordering by completion, ahead of time...

Today's post involves the MagicOrdering project in source control (project 28). When I wrote part 16 of Eduasync , showing composition in the form of majority voting, one reader mailed me a really interesting suggestion. We don't really need to wait for any of the tasks to complete on each iteration...

Posted to Jon Skeet: Coding Blog by skeet on Mon, Jan 16 2012
Filed under: Filed under: C#, C# 5, async, Eduasync
Eduasync part 18: Changes between the Async CTP and the Visual Studio 11 Preview

In preparation for CodeMash, I've been writing some more async code and decompiling it with Reflector. This time I'm using the Visual Studio 11 Developer Preview - the version which installs alongside Visual Studio 2010 under Windows 7. (Don't ask me about any other features of Visual Studio...

Posted to Jon Skeet: Coding Blog by skeet on Wed, Jan 11 2012
Filed under: Filed under: C#, C# 5, async, Eduasync
Eduasync part 17: unit testing

In the last post I showed a method to implement "majority voting" for tasks, allowing a result to become available as soon as possible. At the end, I mentioned that I was reasonably confident that it worked because of the unit tests... but I didn't show the tests themselves. I felt they...

Posted to Jon Skeet: Coding Blog by skeet on Fri, Nov 25 2011
Filed under: Filed under: C#, C# 5, async, Eduasync
Eduasync part 16: Example of composition: majority voting

Note: For the rest of this series, I'll be veering away from the original purpose of the project (investigating what the compiler is up to) in favour of discussing the feature itself. As such, I've added a requirement for AsyncCtpLib.dll - but due to potential distribution restrictions, I've...

Posted to Jon Skeet: Coding Blog by skeet on Tue, Nov 22 2011
Filed under: Filed under: C#, async, Eduasync
Speaking engagement: Progressive .NET, London, September 7th

Just a quick note to mention an event I'll be speaking at in September. SkillsMatter will be hosting Progressive .NET , a 3-day event set of tutorials on September 5th-7th in London. I'll be speaking about C# 5's async feature on the last day (9.30am-1pm) but there's a host of other speakers...

Posted to Jon Skeet: Coding Blog by skeet on Thu, Jul 28 2011
Filed under: Filed under: C#, Speaking engagements, C# 5, async
Eduasync part 14: Data passing in coroutines

(This post covers project 19 in the source code .) Last time we looked at independent coroutines running in a round-robin fashion. This time we'll keep the round-robin scheduling, but add in the idea of passing data from one coroutine to another. Each coroutine will act on data of the same type,...

Posted to Jon Skeet: Coding Blog by skeet on Wed, Jun 29 2011
Filed under: Filed under: C#, C# 5, async, Eduasync
Eduasync part 13: first look at coroutines with async

(This part covers project 18 in the source code .) As I mentioned in earlier parts, the "awaiting" part of async methods is in no way limited to tasks. So long as we have a suitable GetAwaiter() method which returns a value of a type which in turn has suitable methods on it, the compiler doesn't...

Posted to Jon Skeet: Coding Blog by skeet on Wed, Jun 22 2011
Filed under: Filed under: C#, Wacky Ideas, C# 5, async, Eduasync
Eduasync part 12: Observing all exceptions

(This post covers projects 16 and 17 in the source code .) Last time we looked at unwrapping an AggregateException when we await a result. While there are potentially other interesting things we could look at with respect to exceptions (particularly around cancellation) I'm just going to touch on...

Posted to Jon Skeet: Coding Blog by skeet on Wed, Jun 22 2011
Filed under: Filed under: C#, C# 5, async, Eduasync
Eduasync part 11: More sophisticated (but lossy) exception handling

(This post covers projects 13-15 in the source code .) Long-time readers of this blog may not learn much from this post - it's mostly going over what I've covered before . Still, it's new to Eduasync. Why isn't my exception being caught properly? Exceptions are inherently problematic...

Posted to Jon Skeet: Coding Blog by skeet on Wed, Jun 22 2011
Filed under: Filed under: C#, C# 5, async, Eduasync
Eduasync part 10: CTP bug - don't combine multiple awaits in one statement...

(This post covers project 12 in the source code .) Last time, we saw what happens when we have multiple await expressions: we end up with multiple potential states in our state machine. That's all fine, but there's a known bug in the current CTP which affects the code generated when you have...

Posted to Jon Skeet: Coding Blog by skeet on Fri, Jun 10 2011
Filed under: Filed under: C#, C# 5, async, Eduasync
Eduasync part 9: generated code for multiple awaits

Last time we looked at a complex async method with nested loops and a single await. This post is the exact opposite - the method is going to look simple, but it will have three await expressions in. If you're glancing down this post and feel put off by the amount of code, don't worry - once you've...

Posted to Jon Skeet: Coding Blog by skeet on Mon, May 30 2011
Filed under: Filed under: C#, C# 5, async, Eduasync
Eduasync part 8: generated code from a complex async method

Last time we had a really simple async method, and looked at the generated code. Even that took a little while... but in this post I'll demonstrate some of the intricacies that get involved when the async method is more complex. In particular, this time we have: A parameter to the async method A...

Posted to Jon Skeet: Coding Blog by skeet on Sun, May 29 2011
Filed under: Filed under: C#, C# 5, async, Eduasync
Eduasync part 7: generated code from a simple async method

In part 6 we tried to come up with a "manual" translation of a very simple async method. This time we'll see what the compiler really generates. As a reminder, here's the async method in question: private static async Task< int > ReturnValueAsyncWithAssistance() ...

Posted to Jon Skeet: Coding Blog by skeet on Fri, May 20 2011
Filed under: Filed under: C#, C# 5, async, Eduasync
Eduasync part 6: using the infrastructure manually

Now that we've got the infrastructure for both returning a task from an async method, and awaiting a Task<T>, we're going to look at what the compiler does for us. I always find that the best way of appreciating a feature like this is to consider what we'd have to do without it. Later...

Posted to Jon Skeet: Coding Blog by skeet on Fri, May 20 2011
Filed under: Filed under: C#, C# 5, async, Eduasync
Eduasync part 5: making Task<T> awaitable

In part 3 we looked at what the C# 5 compiler required for you to "await" something. The sample used a class which actually had an instance method called GetAwaiter, but I mentioned that it could also be an extension method. In this post, we'll use that ability to make Task<T> awaitable...

Posted to Jon Skeet: Coding Blog by skeet on Tue, May 17 2011
Filed under: Filed under: C#, C# 5, async, Eduasync
Eduasync part 4: Filling in AsyncTaskMethodBuilder<T>

In part 2 , I introduced AsyncVoidMethodBuilder, AsyncTaskMethodBuilder and AsyncTaskMethodBuilder<T>. I showed all the signatures , but the implementations were basically trivial and non-functional. Today, I'm going to change all of that... at least a bit. In particular, by the end of this...

Posted to Jon Skeet: Coding Blog by skeet on Sun, May 15 2011
Filed under: Filed under: C#, C# 5, async, Eduasync

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