WPF Enforce only ONE instance of application

Question

How do I allow only one instance of a WPF application to run?

Thanks.

Answer 1

I use this helper method and call it from the application.startup event

    Public Sub ForceSingleInstanceApplication()
        'Get a reference to the current process
        Dim MyProc As Process = Process.GetCurrentProcess

        'Check how many processes have the same name as the current process
        If (Process.GetProcessesByName(MyProc.ProcessName).Length > 1) Then
            'If there is more than one, it is already running
            MsgBox("Application is already running", MsgBoxStyle.Critical, My.Application.Info.Title) 'Reflection.Assembly.GetCallingAssembly().GetName().Name)
            ' Terminate this process and give the operating system the specified exit code.
            Environment.Exit(-2)
            Exit Sub
        End If
    End Sub