c#-5.0

I'm having difficulty understanding the mechanics behind ExecutionContext. From what I've read online, context-sensitive items such as security (Thread Principal), culture, etc, should flow across asynchronous threads within the bounds of an execution unit of work. I'm encountering very confusing and potentially dangerous bugs though. I'm noticing my thread's CurrentPrincipal is getting lost across async execution. Here is an example ASP.NET Web API scenario: First, let's setup a simple Web API configuration with two delegating handlers for testing purposes. All they do is write out debug

C# 5.0 is out now since August 2012. Where can I find the specification? They've stopped doing ECMA specs, but how about MSDN? Excommunicated It was originally unavailable online but since June 2013 it is available for download from Microsoft . If you have Visual Studio 2012 installed, you will find specification somewhere there: c:\Program Files (x86)\Microsoft Visual Studio 11.0\VC#\Specifications\1033\CSharp Language Specification.docx similar with VS2013: c:\Program Files (x86)\Microsoft Visual Studio 12.0\VC#\Specifications\1033\CSharp Language Specification.docx VS2015: c:\Program Files

I don't see the different between C#'s (and VB's) new async features, and .NET 4.0's Task Parallel Library . Take, for example, Eric Lippert's code from here : async void ArchiveDocuments(List<Url> urls) { Task archive = null; for(int i = 0; i < urls.Count; ++i) { var document = await FetchAsync(urls[i]); if (archive != null) await archive; archive = ArchiveAsync(document); } } It seems that the await keyword is serving two different purposes. The first occurrence ( FetchAsync ) seems to mean, "If this value is used later in the method and its task isn't finished, wait until it completes

Situation is pretty simple - I wrote an extension method and made it async with return type Task<T> . But when I try to call it using await, compiler throws an error which suggests that the extension method wasn't recognized as async at all. Here's my code: public static async Task<NodeReference<T>> CreateWithLabel<T>(this GraphClient client, T source, String label) where T: class { var node = client.Create(source); var url = string.Format(ConfigurationManager.AppSettings[configKey] + "/node/{0}/labels", node.Id); var serializedLabel = string.Empty; using (var tempStream = new MemoryStream())

I copied below code from this link.But when I am compiling this code I am getting an entry point cannot be marked with the 'async' modifier . How can I make this code compilable? class Program { static async void Main(string[] args) { Task<string> getWebPageTask = GetWebPageAsync("http://msdn.microsoft.com"); Debug.WriteLine("In startButton_Click before await"); string webText = await getWebPageTask; Debug.WriteLine("Characters received: " + webText.Length.ToString()); } private static async Task<string> GetWebPageAsync(string url) { // Start an async task. Task<string> getStringTask = (new

The following snippet compiles, but I'd expect it to await the task result instead of giving me a List<Task<T>> . var foo = bars.Select(async bar => await Baz(bar)).ToList() As pointed out here , you need to use Task.WhenAll : var tasks = foos.Select(async foo => await DoSomethingAsync(foo)).ToList(); await Task.WhenAll(tasks); But a comment points out that the async and await inside the Select() is not needed: var tasks = foos.Select(foo => DoSomethingAsync(foo)).ToList(); A similar question here where someone tries to use an async method inside a Where() . So async and await inside a LINQ

Consider Using async without await . think that maybe you misunderstand what async does. The warning is exactly right: if you mark your method async but don't use await anywhere, then your method won't be asynchronous. If you call it, all the code inside the method will execute synchronously. I want write a method that should run async but don't need use await.for example when use a thread public async Task PushCallAsync(CallNotificationInfo callNotificationInfo) { Logger.LogInfo("Pushing new call {0} with {1} id".Fill(callNotificationInfo.CallerId, } I want call PushCallAsync and run async