Question

在表单中，有一个标签。它显示每分钟是否连接Web服务。如何编码重复此过程？我会使用线程还是计时器？请与我分享。

Answer 1

您需要一个计时器对象才能每隔X分钟运行一次代码。如果需要一段时间检查并且您希望表单在此期间保持响应，则只需要使用单独的线程来检查Web服务。

使用计时器非常简单：

Private WithEvents timer As New System.Timers.Timer

Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
    'Set interval to 1 minute
    timer.Interval = 60000 

    'Synchronize with current form, or else an error will occur when trying to
    'update the UI from within the elapsed event
    timer.SynchronizingObject = Me
End Sub


Private Sub timer_Elapsed(ByVal sender As Object, ByVal e As System.Timers.ElapsedEventArgs) Handles timer.Elapsed
    'Add code here to check if the web service is updated and update label
End Sub

每分钟都在刷新

1 个答案: