暂停一个子程序，同时允许用户操作不同的子程序 [英] Pause a sub while allowing user to operate a different sub

问题描述

我正在尝试创建一个 windows 媒体播放器类型的应用程序，特别是后退按钮.需要在第一次点击时将歌曲设置回开头，如果在 2 秒内再次点击，则将歌曲恢复到之前的歌曲.

Hi im trying to create a windows media player type application, specifically the back button. It needs to on the first click set the song back to the start, and if clicked again within 2 seconds change the song back to the one before it.

为此，我将 2 个单独的按钮与 2 个单独的程序重叠，我希望第一个按钮在点击后隐藏 2 秒，然后在 2 秒后显示.虽然 iv 找到了暂时挂起程序的方法，但它不允许我单击后面的按钮来激活其功能.这是我想出的测试代码，任何帮助表示赞赏-

To do this i have overlapped 2 seperate buttons with 2 seperate procedures, i want the first button to hide for 2 seconds once clicked, and then show after those 2 seconds. ALthough iv found ways to temporarily suspend the program, it doesnt allow me to click to button behind to activate its features. This is the test code i came up with, any help appreciated-

Private Sub PictureBox5_Click(sender As Object, e As EventArgs) Handles PictureBox5.Click
    PictureBox5.Visible = False
    System.Threading.Thread.Sleep(2000)
    PictureBox5.Visible = True
End Sub

Private Sub PictureBox4_Click(sender As Object, e As EventArgs) Handles PictureBox4.Click
    MsgBox("Success")
End Sub

推荐答案

你只需要一点点async/await 魔法.通过这种组合，下方的按钮将在两秒内响应:

You just need a little async/await magic. With this combination, the button underneath will be responsive during the two second period:

Private Async Sub PictureBox5_Click(sender As Object, e As EventArgs) Handles PictureBox5.Click
    PictureBox5.Visible = False
    Await Task.Delay(2000)
    PictureBox5.Visible = True
End Sub

注意事件处理程序签名中Private之后的Async！

Notice the Async after Private in the event handler signature!

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