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Visual Basic 2015 Unleashed
book

Visual Basic 2015 Unleashed

by Alessandro Del Sole
July 2015
Intermediate to advanced content levelIntermediate to advanced
1300 pages
87h 27m
English
Sams
Content preview from Visual Basic 2015 Unleashed

Asynchronous Lambda Expressions

Methods can be asynchronous, but so can lambda expressions. To be asynchronous, a lambda must have the Async modifier and must return Task or Task(Of T), but it cannot accept ByRef arguments and cannot be an iterator function. A lambda can be asynchronous when its code uses the Await operator to wait for a Task result. An example of asynchronous lambdas is with event handlers. For instance, you might need to wait for the result of a task when an event is raised, as in the following code snippet that handles a button’s Click:

AddHandler Me.Button1.Click, Async Sub(sender, e)                                 Await DoSomeWorkAsync                             End Sub

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Publisher Resources

ISBN: 9780134196664Purchase book