Visual Basic 2015 Unleashed

Creating Tasks That Return Values

The Task class also has a generic counterpart that you can use for creating tasks that return a value. Consider the following code snippet that creates a task returning a value of type Double, which is the result of calculating the tangent of an angle:

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Dim taskWithResult = Task(Of Double).    Factory.StartNew(Function()                         Dim radians As Double _                             = 120 * Math.PI / 180                         Dim tan As Double = _                             Math.Tan(radians)                         Return tan                     End Function)

You use a Function, which represents a System.Func(Of T), so that you can return a value from your operation. ...