frmkeepitup.vb

清华大学出版社出版的 移动应用开发宝典 张大威（2008）的附书源代码

Imports Microsoft.VisualBasic
Imports System
Imports System.Windows.Forms
Imports System.Threading

Namespace CodeForChapter11cs
  ' Only run this from within the IDE with F5
  Public Partial Class frmKeepItUp
	  Inherits Form
	Public Sub New()
	  InitializeComponent()
	End Sub

	' start thread that will block
	Private Sub menuItem1_Click(ByVal sender As Object, ByVal e As EventArgs) Handles menuItem1.Click
	  Dim t As Thread = New Thread(AddressOf Me.KeepTheProcessUp)
      't.IsBackground = True
	  t.Start()

	  MessageBox.Show("Hit the Exit button. Is VS still debugging")
	End Sub

	Private Sub KeepTheProcessUp()
	  Dim mre As ManualResetEvent = New ManualResetEvent(False)
	  mre.WaitOne()
	  MessageBox.Show("Never shown!")
	  ' imagine more code
	End Sub

	'Exit
	Private Sub menuItem2_Click(ByVal sender As Object, ByVal e As EventArgs) Handles menuItem2.Click
	  Me.Close()
	  Application.Exit() ' utterly superfluous but just to emphasize the point!
	End Sub
  End Class
End Namespace