vb.net 如果已经运行，则阻止应用程序启动
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Prevent application launch if already running
提问by Jeremy
My app needs to check and see if it is already running when launching so it doesn't open a second time. I have a system tray icon that can make the application visible = False. Works great. However, I need to make sure the user looks at the system tray for the notifyicon if the app is already running.
我的应用程序需要在启动时检查它是否已经在运行，以便它不会再次打开。我有一个系统托盘图标，可以使应用程序可见 = False。效果很好。但是，如果应用程序已经在运行，我需要确保用户查看系统托盘中的通知图标。
Private Sub mainWindowSmall_Load(sender As Object, e As EventArgs) Handles MyBase.Load
Dim p() As Process
p = Process.GetProcessesByName("TSC Tool Box")
If p.Count > 0 Then
MessageBox.Show("The TSC Tool Box is already running. Check System tray!", _
"Warning !!!", MessageBoxButtons.OK, _
MessageBoxIcon.Error, MessageBoxDefaultButton.Button2)
Me.Close()
Else
totalOnLoad()
End If
End Sub
VB.NET | winforms
VB.NET | winforms
回答by Joel Coehoorn
This feature is already built in to Windows Forms. Just go to the project properties and click the "Single Instance Application" checkbox. There's also a StartupNextInstanceevent that you can handle.
此功能已内置于 Windows 窗体中。只需转到项目属性并单击“单实例应用程序”复选框。还有一个您可以处理的StartupNextInstance事件。
