в 16:40, 26 мая 2010

2010-05-26T16:40:30Z

Admin: 1 версия

2010-05-26T12:54:04Z

1 версия

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==Add general to Label using AddHandler lblTitle.Click, AddressOf GenericEvent==

<source lang="vbnet">Imports System.Windows.Forms
public class GeneralEventLabel
public Shared Sub Main
Application.Run(New Form1)
End Sub
End class
Public Class Form1
Inherits System.Windows.Forms.Form
#Region " Windows Form Designer generated code "
Public Sub New()
MyBase.New()
"This call is required by the Windows Form Designer.
InitializeComponent()
"Add any initialization after the InitializeComponent() call
End Sub
"Form overrides dispose to clean up the component list.
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
"Required by the Windows Form Designer
Private components As System.ruponentModel.IContainer
"NOTE: The following procedure is required by the Windows Form Designer
"It can be modified using the Windows Form Designer.
"Do not modify it using the code editor.
Friend WithEvents lblTitle As System.Windows.Forms.Label
Friend WithEvents btnTest As System.Windows.Forms.Button
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
Me.lblTitle = New System.Windows.Forms.Label()
Me.btnTest = New System.Windows.Forms.Button()
Me.SuspendLayout()
"
"lblTitle
"
Me.lblTitle.Location = New System.Drawing.Point(40, 32)
Me.lblTitle.Name = "lblTitle"
Me.lblTitle.Size = New System.Drawing.Size(150, 25)
Me.lblTitle.TabIndex = 0
Me.lblTitle.Text = "Events Demonstrator"
AddHandler lblTitle.Click, AddressOf GenericEvent

"
"btnTest
"
Me.btnTest.Location = New System.Drawing.Point(40, 96)
Me.btnTest.Name = "btnTest"
Me.btnTest.TabIndex = 1
Me.btnTest.Text = "Do It!"
"
"Form1
"
Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
Me.ClientSize = New System.Drawing.Size(242, 173)
Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.btnTest, Me.lblTitle})
Me.Name = "Form1"
Me.Text = "Events Demonstrator"
Me.ResumeLayout(False)
End Sub
#End Region
Private Sub btnTest_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnTest.Click
MessageBox.Show("Click event just handled.", "Event Demo")
End Sub
Private Sub lblTitle_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles lblTitle.Click
MessageBox.Show("Click event just handled.", "Event Demo")
End Sub
Private Sub GenericEvent(ByVal sender As System.Object, _
ByVal e As System.EventArgs)
MessageBox.Show("Generic dynamic event just handled.", "Event Demo")
End Sub

End Class</source>

==AddHandler btn.Click, AddressOf btn_Click==

<source lang="vbnet">imports System
imports System.Drawing
imports System.Windows.Forms
public class AddressOfEvent : inherits System.Windows.Forms.Form
Private WithEvents btn as Button
public sub New()
btn = new Button()
btn.Location = new Point(50,50)
btn.Text = "Test"
Controls.Add(btn)
AddHandler btn.Click, AddressOf btn_Click
end sub
public shared sub Main()
Application.Run(new AddressOfEvent())
end sub
private sub btn_Click(ByVal sender as object, _
ByVal e as EventArgs)
MessageBox.Show("btn_Click method","Events Demonstration")
end sub
private sub btn_ClickHandles(ByVal sender as object, _
ByVal e as EventArgs) _
Handles btn.Click
MessageBox.Show("btn_ClickHandles method","Events Demonstration")
end sub
end class</source>

==Events Demonstration - AddHandler==

<source lang="vbnet">imports System
imports System.Drawing
imports System.Windows.Forms
public class EventsDemo : inherits System.Windows.Forms.Form
Private btn as Button
public sub New()
btn = new Button()
btn.Location = new Point(50,50)
btn.Text = "Test"
Controls.Add(btn)
AddHandler btn.Click, AddressOf btn_Click
end sub
public shared sub Main()
Application.Run(new EventsDemo())
end sub
private sub btn_Click(ByVal sender as object,ByVal e as EventArgs)
MessageBox.Show("btn_Click method","Events Demonstration")
end sub
end class</source>

==Use AddHandler to add event handler to a button==

<source lang="vbnet">Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class AddButtonToForm
public Shared Sub Main
Application.Run(New Form1)
End Sub
End class
Public Class Form1
Inherits System.Windows.Forms.Form
#Region " Windows Form Designer generated code "
Public Sub New()
MyBase.New()
"This call is required by the Windows Form Designer.
InitializeComponent()
"Add any initialization after the InitializeComponent() call
End Sub
"Form overrides dispose to clean up the component list.
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
"Required by the Windows Form Designer
Private components As System.ruponentModel.IContainer
"NOTE: The following procedure is required by the Windows Form Designer
"It can be modified using the Windows Form Designer.
"Do not modify it using the code editor.
Friend WithEvents Button1 As System.Windows.Forms.Button
Friend WithEvents TextBox1 As System.Windows.Forms.TextBox
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
Me.Button1 = New System.Windows.Forms.Button
Me.TextBox1 = New System.Windows.Forms.TextBox
Me.SuspendLayout()
"
"Button1
"
Me.Button1.Location = New System.Drawing.Point(104, 56)
Me.Button1.Name = "Button1"
Me.Button1.TabIndex = 0
Me.Button1.Text = "Click Me"
"
"TextBox1
"
Me.TextBox1.Location = New System.Drawing.Point(96, 168)
Me.TextBox1.Name = "TextBox1"
Me.TextBox1.TabIndex = 1
Me.TextBox1.Text = ""
"
"Form1
"
Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
Me.ClientSize = New System.Drawing.Size(292, 273)
Me.Controls.Add(Me.TextBox1)
Me.Controls.Add(Me.Button1)
Me.Name = "Form1"
Me.Text = "Form1"
Me.ResumeLayout(False)
End Sub
#End Region
Dim WithEvents Button2 As Button
Private Sub Button1_Click(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles Button1.Click
Button2 = New Button
Button2.Location = New Point(104, 104)
Button2.Size = New Size(75, 23)
Button2.Text = "And Me!"
AddHandler Button2.Click, AddressOf Button2_Clicked
Controls.Add(Button2)
End Sub
Private Sub Button2_Clicked(ByVal sender As Object, ByVal e As System.EventArgs)
TextBox1.Text = "No problem!"
End Sub
End Class</source>

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VB.Net Tutorial/Event/AddHandler - История изменений

в 16:40, 26 мая 2010

Admin: 1 версия