Your code is short, readable and efficient, so I don’t understand why are you looking for alternatives, but I can’t think of anything. I think your approach is reasonable. I’m also not sure why do you think that the synchronous part is okay in the original version, but you want to avoid it in the … Read more
You can move the logic outside of the catch block and rethrow the exception after, if needed, by using ExceptionDispatchInfo. static async Task f() { ExceptionDispatchInfo capturedException = null; try { await TaskThatFails(); } catch (MyException ex) { capturedException = ExceptionDispatchInfo.Capture(ex); } if (capturedException != null) { await ExceptionHandler(); capturedException.Throw(); } } This way, when … Read more
In the root Web.config make sure assemblyBinding contains the proper version for the assembly “System.Web.WebPages.Razor” and “System.Web.Mvc”. Check for their actual existence as well as my “System.Web.WebPages.Razor” assembly tag was missing causing the error. I had my assembly versions set to 3.0 and 5.0 respectively in the time of this writing with full NuGet updates. … Read more
Take a look at this example, Stephen has a clear answer for you: So this is what happens, starting with the top-level method (Button1_Click for UI / MyController.Get for ASP.NET): The top-level method calls GetJsonAsync (within the UI/ASP.NET context). GetJsonAsync starts the REST request by calling HttpClient.GetStringAsync (still within the context). GetStringAsync returns an uncompleted … Read more
It’s important to make a distinction between two different types of concurrency. Asynchronous concurrency is when you have multiple asynchronous operations in flight (and since each operation is asynchronous, none of them are actually using a thread). Parallel concurrency is when you have multiple threads each doing a separate operation. The first thing to do … Read more
What you are describing can be accomplished with the Task.WhenAll method. Notice how the code turns into a simple one-liner. What happens is that each individual url begins downloading and then WhenAll is used combine those operations into a single Task which can be awaited. Task<IEnumerable<string>> DownLoadAllUrls(string[] urls) { return Task.WhenAll(from url in urls select … Read more
Microsoft released the Async Targeting Pack (Microsoft.Bcl.Async) through Nuget as a replacement for the AsyncCTP. You can read more about it here: http://blogs.msdn.com/b/bclteam/archive/2013/04/17/microsoft-bcl-async-is-now-stable.aspx. You can read about the previous version here: http://blogs.msdn.com/b/lucian/archive/2012/04/24/async-targeting-pack.aspx. As this pack is officially supported, I now believe the best option for targeting XP + async would be using Visual Studio 2012 … Read more
You can set the language feature for each project separately by going to Properties => Build tab => Advanced button => Language Version and set your preferred version. You should realize that it will still use the new “C# 6.0” .Net Compiler Platform (codenamed Roslyn). However, that compiler will imitate the behavior of older compilers … Read more
Does an implicit conversion occur between Task<> and int? Nope. This is just part of how async/await works. Any method declared as async has to have a return type of: void (avoid if possible) Task (no result beyond notification of completion/failure) Task<T> (for a logical result of type T in an async manner) The compiler … Read more
Process.Start() only starts the process, it doesn’t wait until it finishes, so it doesn’t make much sense to make it async. If you still want to do it, you can do something like await Task.Run(() => Process.Start(fileName)). But, if you want to asynchronously wait for the process to finish, you can use the Exited event … Read more