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每分钟刷新一次

发布于 2024-12-07 17:48:57 字数 67 浏览 1 评论 0原文

在表单中，有一个标签。它每分钟显示 Web 服务是否连接。如何编写代码来重复这个过程？我会使用线程还是计时器？请分享我。

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东北女汉子 2024-12-14 17:48:57

您将需要一个计时器对象以便每 X 分钟运行一次代码。仅当检查需要一段时间并且您希望表单在此期间保持响应时，才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

You will need a timer object in order to run the code every X minutes. Using a separate thread to check the web service only needs to be done if it will take a while to check and you want your form to remain responsive during this time.

Using a timer is very easy:

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

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