VB.Net/GUI/Action Handler
Add and Remove Action Handler Dynamically
<source lang="vbnet"> Imports System Imports System.ruponentModel Imports System.Windows.Forms Imports System.Data Imports System.Configuration Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Drawing.Text Imports System.Globalization Imports System.Text Imports System.Collections Public Class MainClass
Shared Sub Main() Dim myform As Form = New Form1() Application.Run(myform) End Sub
End Class
Public Class Form1
Private Sub RadioButton1_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles RadioButton1.CheckedChanged If RadioButton1.Checked Then AddHandler Button1.Click, AddressOf ButtonHandler1 Else RemoveHandler Button1.Click, AddressOf ButtonHandler1 End If End Sub Private Sub RadioButton2_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles RadioButton2.CheckedChanged If RadioButton2.Checked Then AddHandler Button1.Click, AddressOf ButtonHandler2 Else RemoveHandler Button1.Click, AddressOf ButtonHandler2 End If End Sub Private Sub ButtonHandler1(ByVal sender As System.Object, ByVal e As System.EventArgs) MessageBox.Show("Button Handler1") End Sub Private Sub ButtonHandler2(ByVal sender As System.Object, ByVal e As System.EventArgs) MessageBox.Show("Button Handler2") End Sub Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load RadioButton1.Checked = True End Sub
End Class
<Global.Microsoft.VisualBasic.rupilerServices.DesignerGenerated()> _ Partial Public Class Form1
Inherits System.Windows.Forms.Form "Form overrides dispose to clean up the component list. <System.Diagnostics.DebuggerNonUserCode()> _ Protected Overrides Sub Dispose(ByVal disposing As Boolean) If disposing AndAlso components IsNot Nothing Then components.Dispose() 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. <System.Diagnostics.DebuggerStepThrough()> _ Private Sub InitializeComponent() Me.RadioButton1 = New System.Windows.Forms.RadioButton Me.RadioButton2 = New System.Windows.Forms.RadioButton Me.Button1 = New System.Windows.Forms.Button Me.SuspendLayout() " "RadioButton1 " Me.RadioButton1.AutoSize = True Me.RadioButton1.Location = New System.Drawing.Point(8, 8) Me.RadioButton1.Name = "RadioButton1" Me.RadioButton1.Size = New System.Drawing.Size(99, 17) Me.RadioButton1.TabIndex = 0 Me.RadioButton1.Text = "ButtonHandler1" Me.RadioButton1.UseVisualStyleBackColor = True " "RadioButton2 " Me.RadioButton2.AutoSize = True Me.RadioButton2.Location = New System.Drawing.Point(8, 40) Me.RadioButton2.Name = "RadioButton2" Me.RadioButton2.Size = New System.Drawing.Size(99, 17) Me.RadioButton2.TabIndex = 1 Me.RadioButton2.Text = "ButtonHandler2" Me.RadioButton2.UseVisualStyleBackColor = True " "Button1 " Me.Button1.Location = New System.Drawing.Point(152, 16) Me.Button1.Name = "Button1" Me.Button1.Size = New System.Drawing.Size(75, 23) Me.Button1.TabIndex = 2 Me.Button1.Text = "Button1" Me.Button1.UseVisualStyleBackColor = True " "Form1 " Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!) Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font Me.ClientSize = New System.Drawing.Size(292, 273) Me.Controls.Add(Me.Button1) Me.Controls.Add(Me.RadioButton2) Me.Controls.Add(Me.RadioButton1) Me.Name = "Form1" Me.Text = "AddRemoveHandler" Me.ResumeLayout(False) Me.PerformLayout() End Sub Friend WithEvents RadioButton1 As System.Windows.Forms.RadioButton Friend WithEvents RadioButton2 As System.Windows.Forms.RadioButton Friend WithEvents Button1 As System.Windows.Forms.Button
End Class
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