Visual Basic 2015 Unleashed

Measuring Performances of a Classic LINQ Query

The goal of this paragraph is to explain how you can execute a classic LINQ query over intensive processing and measure its performance in milliseconds. Consider the following code:

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Private Sub ClassicLinqQuery()    Dim range = Enumerable.Range(0, 1000)    Dim query = From num In range                Where (IsOdd(num))                Select num    'Measuring performance    Dim sw As Stopwatch = Stopwatch.StartNew    'Linq query is executed when invoking Count    Console.WriteLine("Total odd numbers: " + query.Count.ToString)    sw.Stop()    Console.WriteLine(sw.ElapsedMilliseconds.ToString)    Console.ReadLine()End Sub

Given a range of predefined numbers (Enumerable.Range ...