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This gives you a lot more flexibility around which namespace your code ends up in, and is particularly useful for code-generation scenarios. VB has always had the Namespace and Global keywords, but now you can use them together! VB also allows iterator lambdas! In this example, we use an iterator in an expression context and combine it in a powerful way with XML Literals (note that we’re effectively embedding statements inside embedded expressions now): (The LINQ query binds to this Where extension method since it’s a better match than the Where(Of T) operator defined in the standard query operators). Note the new Iterator and Yield keywords in the Where function. Predicate As Func ( Of Integer, Boolean ) Iterator Function Where(source As Integer (), For instance, the following example prints out only the even numbers in the array:ĭim query = From n In In addition to working with collections, you can use iterators to write your own custom LINQ query operators. Each element is returned to the calling method immediately, before the next element in the sequence is accessed. Iterators are a new feature in VB11 that make it easier to walk through collections such as lists and arrays.
The other thing we’ve added is async unit-testing support in MSTest. So, for consistency, if you’re anywhere outside the declaration line then Shift+F11 (Ctrl+Shift+F8 on VB Profile) will step out to someone who’s awaiting you.
if you’ve gone past an await) then the concept of “caller” doesn’t even exist. If you’re still on the function-declaration-line then it steps out to the caller. F10-Step-Over (or Shift+F8 on VB Profile) now does what you’d expect.
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VB11 also includes full async debugging support. This blog post has a good conceptual explanation of async, and Lucian’s blog has a ton of great resources for learning the feature.
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Once that work completes, the method resumes and the variable packagedFile is assigned to.īe sure to check out the Asynchronous Programming Developer Center for articles, videos, and samples on how to use Async. The function returns a Task(Of T) at the point of the Await expression, but this is just a placeholder for the return value that will come from GetFileAsync. The Await keyword kicks off an asynchronous request without blocking the UI. Current.InstalledLocationĭim packagedFile = Await packageFolder.GetFileAsync( “FileLocatedInPackage” ) StorageFile )ĭim packageFolder = Windows.ApplicationModel. Public Async Function GetStorageFile() As Task ( Of Windows.Storage. With the new Async/Await keywords, VB11 makes asynchronous programming really simple: While user expectations continue to climb, the tool/platform support for making asynchronous programming easy hasn’t kept pace, until now. Things like database queries, network requests, and disk access all have potential to block the UI and leave users frustrated.
And in the true spirit of VB, you’ll see a ton of other improvements that will make you more productive every day.Īs the world moves to mobile phones and tablets, the demand for responsiveness in today’s applications is higher than ever. This is a huge release for Visual Basic as it provides full platform support for building Windows 8 Metro style apps, a first-class asynchronous programming experience, and also the long-awaited Iterators feature. As you may have read in Jason’s announcement, today we announced that Visual Studio 11 Beta is now available for download.