Imports System.Threading '精确计量程序运行时间的STOPWATCH Module Module1 Sub Main1() ' Create new Stopwatch instance. Dim watch As New Diagnostics.Stopwatch watch.Start() '启动 ' Measure. For i As Integer = 0 To 1000 - 1 Threading.Thread.Sleep(1) Next ' 停止并显示时间 watch.Stop() Console.WriteLine(watch.Elapsed.TotalMilliseconds) ' This isn't measured. For i As Integer = 0 To 1000 - 1 Threading.Thread.Sleep(1) Next ' Begin measuring again. watch.Start() ' Measure. For i As Integer = 0 To 1000 - 1 Threading.Thread.Sleep(1) Next ' Stop measuring again (not always needed). watch.Stop() Console.WriteLine(watch.Elapsed.TotalMilliseconds) Console.ReadLine() End Sub Sub Main2() ' Create a Stopwatch and sleep for zero milliseconds. Dim stopwatch As New Diagnostics.Stopwatch ' = stopwatch.StartNew stopwatch.Start() Thread.Sleep(0) stopwatch.Stop() ' Write the current time. Console.WriteLine(stopwatch.ElapsedMilliseconds) Console.WriteLine(DateTime.Now.ToLongTimeString) ' Start a new Stopwatch. stopwatch = stopwatch.StartNew Thread.Sleep(5000) stopwatch.Stop() Console.WriteLine(stopwatch.ElapsedMilliseconds) Console.WriteLine(DateTime.Now.ToLongTimeString) ' Start a new Stopwatch. stopwatch = stopwatch.StartNew Thread.Sleep(1000) stopwatch.Stop() Console.WriteLine(stopwatch.ElapsedMilliseconds) ' Start a new Stopwatch and use SpinWait. stopwatch = stopwatch.StartNew Thread.SpinWait(1000000000) stopwatch.Stop() Console.WriteLine(stopwatch.ElapsedMilliseconds) Console.ReadLine() End Sub Sub Main() 'Dim sw As New Diagnostics.Stopwatch 'sw.Start() 'For i As Integer = 0 To 100000 ' For k As Integer = 0 To 100000 ' Next 'Next 'sw.Stop() 'Console.WriteLine(sw.ElapsedMilliseconds) 'Console.ReadLine() End Sub End Module
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