我试图使一个简单的程序将时间转换为hh：mm：ss格式.但是对于某些特定的输入值,它会产生不正确的时间格式.这是我试过的：
Public Class Form1
Dim Hours,Minutes,Seconds As Integer
Private Sub btnReset_Click(ByVal sender As System.Object,ByVal e As System.EventArgs) Handles btnReset.Click
lblHours.Text = "00"
lblMinutes.Text = "00"
lblSeconds.Text = "00"
txtTimeSeconds.Text = ""
txtFormattedTime.Text = ""
End Sub
Private Sub btnCalculate_Click(ByVal sender As System.Object,ByVal e As System.EventArgs) Handles btnCalculate1.Click
Seconds = Integer.Parse(txtTimeSeconds.Text)
Hours = Seconds / 3600
Seconds = Seconds Mod 3600
Minutes = Seconds / 60
Seconds = Seconds Mod 60
lblHours.Text = Hours.ToString.PadLeft(2,"0"c)
lblMinutes.Text = Minutes.ToString.PadLeft(2,"0"c)
lblSeconds.Text = Seconds.ToString.PadLeft(2,"0"c)
txtFormattedTime.Text = Hours.ToString.PadLeft(2,"0"c) & ":" & Minutes.ToString.PadLeft(2,"0"c) & ":" & Seconds.ToString.PadLeft(2,"0"c)
End Sub
End Class
当输入值为30时,它工作：
当输入值为31时,它不起作用：
我做错了什么？如何解决这个问题？
.NET中有一个叫做
TimeSpan的类,它使你的代码变得简单而优雅.
例：
dim iSecond as double = 0 'Total number of seconds
Dim iSpan As TimeSpan = TimeSpan.FromSeconds(iSecond)
lblHours.Text = iSpan.Hours.ToString.PadLeft(2,"0"c)
lblMinutes.Text = iSpan.Minutes.ToString.PadLeft(2,"0"c)
lblSeconds.Text = iSpan.Seconds.ToString.PadLeft(2,"0"c)
txtFormattedTime.Text = iSpan.Hours.ToString.PadLeft(2,"0"c) & ":" & _
iSpan.Minutes.ToString.PadLeft(2,"0"c) & ":" & _
iSpan.Seconds.ToString.PadLeft(2,"0"c)