.net - VB.NET:如何知道哪个系统空闲的时间？

Question

我正在制作一个应用程序，在系统空闲时，即当用户未与系统交互时，我在其中实现自动监控关闭。

我找到了一个链接:http://www.codeproject.com/KB/system/SystemIdleTimerComponent.aspx

它确实提供了知道系统何时空闲的组件。但是当我包括:

Public WM_SYSCOMMAND As Integer = &H112
Public SC_MONITORPOWER As Integer = &Hf170

<DllImport("user32.dll")> _
Private Shared Function SendMessage(hWnd As Integer, hMsg As Integer, wParam As Integer, lParam As Integer) As Integer
End Function

Private Sub button1_Click(sender As Object, e As System.EventArgs)
    SendMessage(Me.Handle.ToInt32(), WM_SYSCOMMAND, SC_MONITORPOWER, 2)
End Sub

它显示此错误:跨线程操作无效:从创建它的线程以外的线程访问控件“Form1”。

Answer 1

It shows this error: Cross-thread operation not valid: Control 'Form1' accessed from a thread other than the thread it was created on.

不要从另一个线程访问 Form1。阅读调用模式。