Get event sender type : Event « Event « VB.Net Tutorial






Get event sender type
Imports System.Windows.Forms

public class TypeOfSenderIsControl
   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.ComponentModel.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 Button2 As System.Windows.Forms.Button
    Friend WithEvents Button3 As System.Windows.Forms.Button
    Friend WithEvents Button4 As System.Windows.Forms.Button
    Friend WithEvents Button5 As System.Windows.Forms.Button
    Friend WithEvents Button6 As System.Windows.Forms.Button
    Friend WithEvents Button7 As System.Windows.Forms.Button
    Friend WithEvents Button8 As System.Windows.Forms.Button
    Friend WithEvents Button9 As System.Windows.Forms.Button
    Friend WithEvents Button10 As System.Windows.Forms.Button
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.Button1 = New System.Windows.Forms.Button
        Me.Button2 = New System.Windows.Forms.Button
        Me.Button3 = New System.Windows.Forms.Button
        Me.Button4 = New System.Windows.Forms.Button
        Me.Button5 = New System.Windows.Forms.Button
        Me.Button6 = New System.Windows.Forms.Button
        Me.Button7 = New System.Windows.Forms.Button
        Me.Button8 = New System.Windows.Forms.Button
        Me.Button9 = New System.Windows.Forms.Button
        Me.Button10 = New System.Windows.Forms.Button
        Me.SuspendLayout()
        '
        'Button1
        '
        Me.Button1.Location = New System.Drawing.Point(80, 16)
        Me.Button1.Name = "Button1"
        Me.Button1.TabIndex = 0
        Me.Button1.Text = "Button1"
        '
        'Button2
        '
        Me.Button2.Location = New System.Drawing.Point(80, 48)
        Me.Button2.Name = "Button2"
        Me.Button2.TabIndex = 1
        Me.Button2.Text = "Button2"
        '
        'Button3
        '
        Me.Button3.Location = New System.Drawing.Point(80, 80)
        Me.Button3.Name = "Button3"
        Me.Button3.TabIndex = 2
        Me.Button3.Text = "Button3"
        '
        'Button4
        '
        Me.Button4.Location = New System.Drawing.Point(80, 112)
        Me.Button4.Name = "Button4"
        Me.Button4.TabIndex = 3
        Me.Button4.Text = "Button4"
        '
        'Button5
        '
        Me.Button5.Location = New System.Drawing.Point(80, 144)
        Me.Button5.Name = "Button5"
        Me.Button5.TabIndex = 4
        Me.Button5.Text = "Button5"
        '
        'Button6
        '
        Me.Button6.Location = New System.Drawing.Point(168, 16)
        Me.Button6.Name = "Button6"
        Me.Button6.TabIndex = 5
        Me.Button6.Text = "Button6"
        '
        'Button7
        '
        Me.Button7.Location = New System.Drawing.Point(168, 48)
        Me.Button7.Name = "Button7"
        Me.Button7.TabIndex = 6
        Me.Button7.Text = "Button7"
        '
        'Button8
        '
        Me.Button8.Location = New System.Drawing.Point(168, 80)
        Me.Button8.Name = "Button8"
        Me.Button8.TabIndex = 7
        Me.Button8.Text = "Button8"
        '
        'Button9
        '
        Me.Button9.Location = New System.Drawing.Point(168, 112)
        Me.Button9.Name = "Button9"
        Me.Button9.TabIndex = 8
        Me.Button9.Text = "Button9"
        '
        'Button10
        '
        Me.Button10.Location = New System.Drawing.Point(168, 144)
        Me.Button10.Name = "Button10"
        Me.Button10.TabIndex = 9
        Me.Button10.Text = "Button10"
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(292, 273)
        Me.Controls.Add(Me.Button10)
        Me.Controls.Add(Me.Button9)
        Me.Controls.Add(Me.Button8)
        Me.Controls.Add(Me.Button7)
        Me.Controls.Add(Me.Button6)
        Me.Controls.Add(Me.Button5)
        Me.Controls.Add(Me.Button4)
        Me.Controls.Add(Me.Button3)
        Me.Controls.Add(Me.Button2)
        Me.Controls.Add(Me.Button1)
        Me.Name = "Form1"
        Me.Text = "Form1"
        Me.ResumeLayout(False)

    End Sub

#End Region

    Private Sub Button1_Click( _
             ByVal sender As System.Object, _
             ByVal e As System.EventArgs) _
             Handles Button1.Click
        MsgBox("Hello World!")
    End Sub

    Private Sub LotsOfButtons( _
            ByVal sender As System.Object, _
            ByVal e As System.EventArgs) _
            Handles Button1.Click, Button2.Click, _
                    Button3.Click, Button4.Click, _
                    Button5.Click, Button6.Click, _
                    Button7.Click, Button8.Click, _
                    Button9.Click, Button10.Click
        Dim clickedCtrl As Control
        If TypeOf sender Is Control Then
            clickedCtrl = DirectCast(sender, Control)
            Console.WriteLine(clickedCtrl.Text)
        End If
    End Sub
End Class








11.1.Event
11.1.1.Raise Events
11.1.2.Multiple Event Handler
11.1.3.Event handler
11.1.4.Subclass EventArgs to create your own event arguments
11.1.5.Inherit Event
11.1.6.Custom event handler
11.1.7.WithEvents and Event method
11.1.8.Add and remove event handlerAdd and remove event handler
11.1.9.Handle events from more than one componentsHandle events from more than one components
11.1.10.Add, remove event handler to/from ToggleButtonAdd, remove event handler to/from ToggleButton
11.1.11.Use one method to handle more than one RadioButton click eventUse one method to handle more than one RadioButton click event
11.1.12.Get event sender typeGet event sender type
11.1.13.Instantiating the Action<(Of <(T>)>) delegate rather than explicitly defining a new delegate and assigning a named method