将百分比分析为双倍

你这样做对我来说似乎很好。

我要注意的唯一一点是,您的程序假定了不变的区域性。确保这就是你的意思。例如,如果字符串来自用户输入,而不是固定的定义良好的协议,那么最好使用机器的默认区域性。

您可以投票支持此.NET Framework 4关于Microsoft Connect的建议: Extend double.Parse to interpret Percent values

我不熟悉VB,但是用它创建函数已经更好了

伪代码:

function PercentToDouble( Buffer )
    return Double.Parse(Buffer.Replace("%",""), NumberStyles.Any, CultureInfo.InvariantCulture) / 100;
endfunction

如果百分比是用户输入,则

Private Sub Button2_Click(sender As System.Object, e As System.EventArgs) Handles Button2.Click
    Dim pb As New PictureBox
    Dim foo As New gameObj(pb, gameObjType.person)

    Dim sInps() As String = New String() {"50.00 %", "51.00%", ".52", "53", ".54%"}

    For Each sampleInput As String In sInps
        Debug.WriteLine(ConvertPercentToDouble(sampleInput).ToString("n4"))
    Next

End Sub

Private Function ConvertPercentToDouble(s As String) As Double
    Dim Value As Double
    Dim hasPercent As Boolean = s.Contains(System.Globalization.NumberFormatInfo.CurrentInfo.PercentSymbol)
    Dim whereIsPC As Integer = Math.Max(s.IndexOf(" "), _
                                        s.IndexOf(System.Globalization.NumberFormatInfo.CurrentInfo.PercentSymbol))
    If Double.TryParse(s, Value) _
        OrElse Double.TryParse(s.Substring(0, whereIsPC).Trim, Value) Then
        If Value > 1 OrElse hasPercent Then Value /= 100 
        Return Value
    Else
        Throw New ArgumentException("YOUR ERROR HERE")
    End If
End Function