我正在为班级创建一个微波炉应用程序。我的应用程序大部分都运行良好,唯一的问题是我得到了一个奇怪的显示输出,我相信这与我的子字符串格式有关,但我不完全确定。基本上发生的事情是,如果用户输入 1:25 烹饪时间,输出读数为 1:125,如果启动,微波炉仅从 1:00 开始倒计时。任何帮助将不胜感激!!
Private Sub DisplayTime()
Dim hour As Integer
Dim second As Integer
Dim minute As Integer
Dim display As String ' String displays current input
' if too much input entered
If timeIs.Length > 5 Then
timeIs = timeIs.Substring(0, 5)
End If
display = timeIs.PadLeft(5, "0"c)
' extract seconds, minutes, and hours
second = Convert.ToInt32(display.Substring(2))
minute = Convert.ToInt32(display.Substring(1, 2))
hour = Convert.ToInt32(display.Substring(0, 1))
' display number of hours, minutes, ":" seconds
displayLabel.Text = String.Format("{0:D1}:{1:D2}:{2:D2}",
hour, minute, second)
End Sub ' DisplayTime
' event handler displays new time each second
Private Sub clockTimer_Tick(sender As System.Object,
e As System.EventArgs) Handles clockTimer.Tick
' perform countdown, subtract one second
If timeObject.Second > 0 Then
timeObject.Second -= 1
displayLabel.Text = String.Format("{0:D1}:{1:D2}:{2:D2}",
timeObject.Hour, timeObject.Minute, timeObject.Second)
ElseIf timeObject.Minute > 0 Then
timeObject.Minute -= 1
timeObject.Second = 59
displayLabel.Text = String.Format("{0:D1}:{1:D2}:{2:D2}",
timeObject.Hour, timeObject.Minute, timeObject.Second)
ElseIf timeObject.Hour > 0 Then
timeObject.Hour -= 1
timeObject.Minute = 59
timeObject.Second = 59
displayLabel.Text = String.Format("{0:D1}:{1:D2}:{2:D2}",
timeObject.Hour, timeObject.Minute, timeObject.Second)
Else ' countdown finished
clockTimer.Enabled = False ' stop timer
Beep()
displayLabel.Text = "Done!" ' inform user time is finished
windowPanel.BackColor = Control.DefaultBackColor
End If
End Sub ' clockTimer_Tick
End Class ' MicrowaveOvenForm