VB.Net Tutorial/GUI Applications/Application Thread — различия между версиями
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Текущая версия на 15:56, 26 мая 2010
Application Thread
<source lang="vbnet">Imports System.Windows.Forms Public Class Form1
Inherits System.Windows.Forms.Form Public Sub New() MyBase.New() InitializeComponent() End Sub Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean) If disposing Then If Not (components Is Nothing) Then components.Dispose() End If End If MyBase.Dispose(disposing) End Sub Private components As System.ruponentModel.IContainer Friend WithEvents button4 As System.Windows.Forms.Button Friend WithEvents button3 As System.Windows.Forms.Button Friend WithEvents button2 As System.Windows.Forms.Button Friend WithEvents button1 As System.Windows.Forms.Button <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent() Me.button4 = New System.Windows.Forms.Button() Me.button3 = New System.Windows.Forms.Button() Me.button2 = New System.Windows.Forms.Button() Me.button1 = New System.Windows.Forms.Button() Me.SuspendLayout() " Me.button4.Location = New System.Drawing.Point(24, 127) Me.button4.Name = "button4" Me.button4.Size = New System.Drawing.Size(144, 23) Me.button4.TabIndex = 7 Me.button4.Text = "Show MessageBox" " Me.button3.Location = New System.Drawing.Point(24, 90) Me.button3.Name = "button3" Me.button3.Size = New System.Drawing.Size(144, 23) Me.button3.TabIndex = 6 Me.button3.Text = "Throw Exception" " Me.button2.Location = New System.Drawing.Point(24, 53) Me.button2.Name = "button2" Me.button2.Size = New System.Drawing.Size(144, 23) Me.button2.TabIndex = 5 Me.button2.Text = "Application.ExitThread" " "button1 " Me.button1.Location = New System.Drawing.Point(24, 16) Me.button1.Name = "button1" Me.button1.Size = New System.Drawing.Size(144, 23) Me.button1.TabIndex = 4 Me.button1.Text = "Application.Exit" " "Form1 " Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13) Me.ClientSize = New System.Drawing.Size(192, 166) Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.button4, Me.button3, Me.button2, Me.button1}) Me.Name = "Form1" Me.Text = "Applications" Me.ResumeLayout(False) End Sub Shared Sub App_Exit(ByVal sender As Object, ByVal e As EventArgs) System.Diagnostics.Debug.WriteLine("App_Exit") End Sub Shared Sub App_Idle(ByVal sender As Object, ByVal e As EventArgs) System.Diagnostics.Debug.WriteLine("App_Idle") End Sub Shared Sub App_ThreadingException(ByVal sender As Object, ByVal e As System.Threading.ThreadExceptionEventArgs) System.Diagnostics.Debug.WriteLine("App_ThreadException") Dim msg As String = "A problem has occurred in this application." & vbCrLf & vbCrLf & _ vbTab & e.Exception.Message & vbCrLf & vbCrLf & _ "Would you like to continue the application so that " & vbCrLf & _ "you can save your work?" Dim res As DialogResult = MessageBox.Show(msg, "Unexpected Error", MessageBoxButtons.YesNo) If res = System.Windows.Forms.DialogResult.Yes Then Exit Sub Application.Exit() End Sub Shared Sub DumpThreadID(ByVal name As String) System.Diagnostics.Debug.WriteLine(name & " thread id= " & System.AppDomain.GetCurrentThreadId().ToString()) End Sub Shared Sub DummyThreadStart() DumpThreadID("Dummy Thread") AddHandler Application.ThreadExit, New EventHandler(AddressOf App_ThreadExit) End Sub Shared Sub Main() AddHandler Application.ThreadException, New System.Threading.ThreadExceptionEventHandler(AddressOf App_ThreadingException) AddHandler Application.Idle, New EventHandler(AddressOf App_Idle) AddHandler Application.ThreadExit, New EventHandler(AddressOf App_ThreadExit) AddHandler Application.ApplicationExit, New EventHandler(AddressOf App_Exit) DumpThreadID("UI Thread") Dim dummythread As System.Threading.Thread = New System.Threading.Thread(New System.Threading.ThreadStart(AddressOf DummyThreadStart)) dummythread.Start() Application.Run(New Form1()) End Sub Shared Sub App_ThreadExit(ByVal sender As Object, ByVal e As EventArgs) System.Diagnostics.Debug.WriteLine("App_ThreadExit on thread id= " & System.AppDomain.GetCurrentThreadId().ToString()) End Sub Private Sub button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles button1.Click Application.Exit() End Sub Private Sub button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles button2.Click Application.ExitThread() End Sub Private Sub button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles button3.Click Throw New System.IO.FileLoadException() End Sub
End Class</source>