CSng()还是x 1F?

为了可读性和揭示意图,我会选择:

Dim mySingle as Single = CSng(a / b)  ' CSng

使用A,你很清楚地说,我知道计算返回一个不同的类型,这就是我想要的。

至于性能-我运行了一个快速的微基准测试,每次测试100万次迭代,差别在毫秒到亚毫秒之间,对我来说是一个非常微小的优势 CSing

基准代码:

Sub Main()
    Dim mySingle As Single
    Dim a As Integer = 10
    Dim b As Integer = 5

    Dim iterations As Integer = 1000000

    Dim sw As New Stopwatch()

    sw.Start()
    For i As Integer = 1 To iterations
        mySingle = CSng(a / b)  ' CSng '
    Next
    sw.Stop()

    Console.WriteLine(String.Format("CSng(a / b) - {0}", sw.Elapsed))


    sw.Reset()
    sw.Start()
    For i As Integer = 1 To iterations
        mySingle = a * 1.0F / b  ' x 1F '
    Next
    sw.Stop()

    Console.WriteLine(String.Format(" a * 1.0F / b - {0}", sw.Elapsed))

End Sub