How can I write a line of code that sets an object to be an object thats
contained on the parent form.
Basically, I have a usercontrol, where one of the properties that I have
added that can be entered at design time is an object name (on a windows
form).
I want to be able to set a variable to that object within the control so I
can then manipulate it.
I know this involves reflection, but I can't work out the correct sytnax.
Hope somebody can help.
Thanks in advance
Simon
11  1381 
Hi Simon,
Do your DataObjects belong to the ControlCollection of the Form at
DesignTime (or ComponentTray) or are they Instanciated at Run-Time.
I guess this post is related to the other I've replied to.
If you wich you can mail me your Class and I will look into it. If my "Gut
feelings" are right, I think I know how to resolve your problem.
Just let me know if you want to mail me your class, then I'll give you my
email-address.
Kind regards,
Michael
"Simon Verona" <ne**@aphroditeuk.com> wrote in message
news:OP**************@tk2msftngp13.phx.gbl... How can I write a line of code that sets an object to be an object thats
contained on the parent form.
Basically, I have a usercontrol, where one of the properties that I have
added that can be entered at design time is an object name (on a windows
form).
I want to be able to set a variable to that object within the control so I
can then manipulate it.
I know this involves reflection, but I can't work out the correct sytnax.
Hope somebody can help.
Thanks in advance
Simon
Michael
The class is pretty straightforward.. It's a simple class, not inherited
from anything.
The instance of the class is defined within the Windows form as a form level
object...
ie Friend myObject as new myClass
public sub new() ... etc etc etc
You are correct it's related to my other post.. my inherited text box
will have a property set to "myObject" (in the above example) ... I simply
want to gain access to myObject so that I can use it in a
bindings.add("text",this_is_the_function_I_Need("M yObject"),"MyProperty")
type of statement....
I've not yet tried any of your ideas yet... but I will be! In any case, I
think I still need to solve this issue..
Many thanks
Simon
"Michael Maes" <mi*****@merlot.com> wrote in message
news:em**************@TK2MSFTNGP10.phx.gbl... Hi Simon,
Do your DataObjects belong to the ControlCollection of the Form at
DesignTime (or ComponentTray) or are they Instanciated at Run-Time.
I guess this post is related to the other I've replied to.
If you wich you can mail me your Class and I will look into it. If my "Gut
feelings" are right, I think I know how to resolve your problem.
Just let me know if you want to mail me your class, then I'll give you my
email-address.
Kind regards,
Michael
"Simon Verona" <ne**@aphroditeuk.com> wrote in message
news:OP**************@tk2msftngp13.phx.gbl... How can I write a line of code that sets an object to be an object thats
contained on the parent form.
Basically, I have a usercontrol, where one of the properties that I have
added that can be entered at design time is an object name (on a windows
form).
I want to be able to set a variable to that object within the control so
I can then manipulate it.
I know this involves reflection, but I can't work out the correct
sytnax.
Hope somebody can help.
Thanks in advance
Simon
Good morning Simon,
I think I'm getting a better idea of your issue now (a bit late hum...).
So to be sure:
Is your DataObject instanciated through Code, something like:
Friend MyDataObject As DataObjectClass_A
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
MyDataObject = New DataObjectClass_A
MyTextBox.DataBindings.Add(New System.Windows.Forms.Binding("Text", MyDataObject, "Property_XYZ"))
End Sub
I doubt this is the case, because that would be a bit simple.....
Is your DataObjectClass a Component? (You add a DataObject from the Toolbox to your ComponentTray like you would do with a DataSet)
Public Class DataObjectClass
Inherits System.ComponentModel.Component
.............
End Class
If both scenario's don't apply to your case, then could you please make clear How your DataObjects get instanciated (eg: Remoting, WebService, ....)
Reflection can be used both at Runtime & DesignTime, but I'm not yet convinced you need it. I think I can help you out here, but it would be verry helpful if you posted (or mailed) me some (dummy)-code (keeping the Hierarchy, Namespaces, etc...)
Best regards,
Michael
Michael,
Yep, thats pretty much it!
I've done a simple demo to show what I've done..
Form1: (I've stripped all the declaration stuff out...)
Dim Vehicle As New Vehicle
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Load
TextBox1.DataBindings.Add("Text", Vehicle, "Data")
End Sub
Control TextBox1: inherits from textbox
Dim m_ObjectName As String
Dim m_PropertyName As String
Public Property ObjectName() As String
Get
Return m_ObjectName
End Get
Set(ByVal Value As String)
m_ObjectName = Value
BindData()
End Set
End Property
Public Property PropertyName() As String
Get
Return m_PropertyName
End Get
Set(ByVal Value As String)
m_PropertyName = Value
BindData()
End Set
End Property
Private Sub BindData()
' Bind Data
' It's this sub that I can't seem to get right!!!
End Sub
Class Vehicle: (complete)
Public Class vehicle
Private dat As String = "hello"
Event DataChanged As EventHandler
Public Property Data()
Get
Return dat
End Get
Set(ByVal Value)
dat = Value
RaiseEvent DataChanged(Me, New EventArgs)
End Set
End Property
I want to be able to remove the databindings.add from my form and get my
control to bind automatically on instantation...
I hope that the code clarifies what I want to do... I just want to be
able to do all my databindings within my control (my real control is
somewhat more complex than this as it has other fields for automatic data
validation and data lookup etc).
Many thanks for your time so far! I think I'm getting real close to a
solution - down to the last line of code..
regards
Simon
"Michael Maes" <mi*****@merlot.com> wrote in message
news:%2****************@TK2MSFTNGP11.phx.gbl...
Good morning Simon,
I think I'm getting a better idea of your issue now (a bit late hum...).
So to be sure:
Is your DataObject instanciated through Code, something like:
Friend MyDataObject As DataObjectClass_A
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Load
MyDataObject = New DataObjectClass_A
MyTextBox.DataBindings.Add(New System.Windows.Forms.Binding("Text",
MyDataObject, "Property_XYZ"))
End Sub
I doubt this is the case, because that would be a bit simple.....
Is your DataObjectClass a Component? (You add a DataObject from the Toolbox
to your ComponentTray like you would do with a DataSet)
Public Class DataObjectClass
Inherits System.ComponentModel.Component
.............
End Class
If both scenario's don't apply to your case, then could you please make
clear How your DataObjects get instanciated (eg: Remoting, WebService, ...)
Reflection can be used both at Runtime & DesignTime, but I'm not yet
convinced you need it. I think I can help you out here, but it would be
verry helpful if you posted (or mailed) me some (dummy)-code (keeping the
Hierarchy, Namespaces, etc...)
Best regards,
Michael
Hi Simon,
I'll look at this in the afternoon (we diff one hour ;-) ). Have to go to
see a customer now.
Michael
Hi Simon,
I haven't got the time to get it to work fully (I think the approach is not right), but I guess you'll have a good "manual" with this code.
I have three classes:
a.. Simon (Testform)
b.. SimonData (DataObject Vehicle & Airplane)
c.. SimonTextBox
Good luck with this and please ..... when you get this right, post the code to this thread, so others can have a good sample !!!!
Thanks,
Michael
--------------------------------------------------------------------------------
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 myTextBox1 As Simon.myTextBox
Friend WithEvents MyTextBox1 As SimonTextBox.myTextBox
Friend WithEvents MyTextBox2 As SimonTextBox.myTextBox
Friend WithEvents MyTextBox3 As SimonTextBox.myTextBox
Friend WithEvents Label1 As System.Windows.Forms.Label
Friend WithEvents Label2 As System.Windows.Forms.Label
Friend WithEvents Label3 As System.Windows.Forms.Label
Friend WithEvents Label4 As System.Windows.Forms.Label
Friend WithEvents MyTextBox4 As SimonTextBox.myTextBox
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
Me.Button1 = New System.Windows.Forms.Button
Me.MyTextBox1 = New SimonTextBox.myTextBox
Me.MyTextBox2 = New SimonTextBox.myTextBox
Me.MyTextBox3 = New SimonTextBox.myTextBox
Me.Label1 = New System.Windows.Forms.Label
Me.Label2 = New System.Windows.Forms.Label
Me.Label3 = New System.Windows.Forms.Label
Me.Label4 = New System.Windows.Forms.Label
Me.MyTextBox4 = New SimonTextBox.myTextBox
Me.SuspendLayout()
'
'Button1
'
Me.Button1.Location = New System.Drawing.Point(200, 209)
Me.Button1.Name = "Button1"
Me.Button1.TabIndex = 1
Me.Button1.Text = "Button1"
'
'MyTextBox1
'
Me.MyTextBox1.Location = New System.Drawing.Point(30, 33)
Me.MyTextBox1.Name = "MyTextBox1"
Me.MyTextBox1.ObjectName = "Vehicle"
Me.MyTextBox1.PropertyName = "Text"
Me.MyTextBox1.TabIndex = 2
Me.MyTextBox1.Text = "MyTextBox1"
'
'MyTextBox2
'
Me.MyTextBox2.Location = New System.Drawing.Point(30, 66)
Me.MyTextBox2.Name = "MyTextBox2"
Me.MyTextBox2.ObjectName = ""
Me.MyTextBox2.PropertyName = ""
Me.MyTextBox2.TabIndex = 2
Me.MyTextBox2.Text = "MyTextBox2"
'
'MyTextBox3
'
Me.MyTextBox3.Location = New System.Drawing.Point(30, 99)
Me.MyTextBox3.Name = "MyTextBox3"
Me.MyTextBox3.ObjectName = "Airplane"
Me.MyTextBox3.PropertyName = "Text"
Me.MyTextBox3.TabIndex = 2
Me.MyTextBox3.Text = "MyTextBox3"
'
'Label1
'
Me.Label1.Location = New System.Drawing.Point(140, 33)
Me.Label1.Name = "Label1"
Me.Label1.Size = New System.Drawing.Size(140, 23)
Me.Label1.TabIndex = 3
Me.Label1.Text = "Bound to Vehicle"
Me.Label1.TextAlign = System.Drawing.ContentAlignment.MiddleLeft
'
'Label2
'
Me.Label2.Location = New System.Drawing.Point(140, 66)
Me.Label2.Name = "Label2"
Me.Label2.Size = New System.Drawing.Size(140, 23)
Me.Label2.TabIndex = 3
Me.Label2.Text = "Not Bound"
Me.Label2.TextAlign = System.Drawing.ContentAlignment.MiddleLeft
'
'Label3
'
Me.Label3.Location = New System.Drawing.Point(140, 99)
Me.Label3.Name = "Label3"
Me.Label3.Size = New System.Drawing.Size(140, 23)
Me.Label3.TabIndex = 3
Me.Label3.Text = "Bound to Airplane"
Me.Label3.TextAlign = System.Drawing.ContentAlignment.MiddleLeft
'
'Label4
'
Me.Label4.Location = New System.Drawing.Point(140, 132)
Me.Label4.Name = "Label4"
Me.Label4.Size = New System.Drawing.Size(140, 23)
Me.Label4.TabIndex = 3
Me.Label4.Text = """Bound"" to Illegal Object"
Me.Label4.TextAlign = System.Drawing.ContentAlignment.MiddleLeft
'
'MyTextBox4
'
Me.MyTextBox4.Location = New System.Drawing.Point(30, 132)
Me.MyTextBox4.Name = "MyTextBox4"
Me.MyTextBox4.ObjectName = "Boat"
Me.MyTextBox4.PropertyName = "Text"
Me.MyTextBox4.TabIndex = 2
Me.MyTextBox4.Text = "MyTextBox4"
'
'Form1
'
Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
Me.ClientSize = New System.Drawing.Size(292, 266)
Me.Controls.Add(Me.Label1)
Me.Controls.Add(Me.MyTextBox1)
Me.Controls.Add(Me.Button1)
Me.Controls.Add(Me.MyTextBox2)
Me.Controls.Add(Me.MyTextBox3)
Me.Controls.Add(Me.Label2)
Me.Controls.Add(Me.Label3)
Me.Controls.Add(Me.Label4)
Me.Controls.Add(Me.MyTextBox4)
Me.Name = "Form1"
Me.Text = "Form1"
Me.ResumeLayout(False)
End Sub
#End Region
' Dim Vehicle As New Vehicle
' You need to listen for events: WithEvents
Dim WithEvents Vehicle As SimonData.Vehicle
Dim WithEvents Airplane As SimonData.Airplane
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
InitializeDataObjects()
End Sub
#Region " Instantiation "
Private Sub InitializeDataObjects()
Vehicle = New SimonData.Vehicle
Airplane = New SimonData.Airplane
End Sub
#End Region
'Dim DataValues As String
'Private Sub Vehicle_DataChanging(ByVal sender As Object, ByVal e As System.EventArgs) Handles Vehicle.DataChanging
' DataValues = "Old value: " & Vehicle.Data.ToString
'End Sub
'Private Sub Vehicle_DataChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles Vehicle.DataChanged
' DataValues += vbCrLf & "New value: " & Vehicle.Data.ToString
' MsgBox(DataValues)
'End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim s As String
s += "Vehicle = " & Me.Vehicle.Data.ToString + vbCrLf
s += "Airplane = " & Me.Airplane.Data.ToString
MsgBox(s)
End Sub
End Class
--------------------------------------------------------------------------------
Option Strict Off
Public Class Vehicle
'Implements System.ComponentModel.IBindingList
Private dat As String = "Hello Vehicle"
'Event DataChanged As EventHandler SCOPE YOUR EVENT
Public Event DataChanged As EventHandler
Public Event DataChanging As EventHandler
Public Property Data()
Get
Return dat
End Get
Set(ByVal Value)
Debug.WriteLine("Data Set for Vehicle") : Beep()
If dat = Value Then
' Nothing has changed, so skip all the processing!
Exit Property
End If
OnDataChanging(Me, New EventArgs)
dat = Value
' RaiseEvent DataChanged(Me, New EventArgs)
' THIS IS NOT DONE: DON'T RAISE AN EVENT DIRECTLY
' USE A "On" + EVENT SUB (Convention)
OnDataChanged(Me, New EventArgs)
End Set
End Property
Public Overridable Sub OnDataChanging(ByVal sender As Object, ByVal e As System.EventArgs)
RaiseEvent DataChanging(Me, New EventArgs)
End Sub
Public Overridable Sub OnDataChanged(ByVal sender As Object, ByVal e As System.EventArgs)
RaiseEvent DataChanged(Me, New EventArgs)
End Sub
End Class
************************************************** ***************
Option Strict Off
Public Class Airplane
Private dat As String = "Hello Airplane"
'Event DataChanged As EventHandler SCOPE YOUR EVENT
Public Event DataChanged As EventHandler
Public Event DataChanging As EventHandler
Public Property Data()
Get
Return dat
End Get
Set(ByVal Value)
Debug.WriteLine("Data Set for Vehicle") : Beep()
If dat = Value Then
' Nothing has changed, so skip all the processing!
Exit Property
End If
OnDataChanging(Me, New EventArgs)
dat = Value
' RaiseEvent DataChanged(Me, New EventArgs)
' THIS IS NOT DONE: DON'T RAISE AN EVENT DIRECTLY
' USE A "On" + EVENT SUB (Convention)
OnDataChanged(Me, New EventArgs)
End Set
End Property
Public Overridable Sub OnDataChanging(ByVal sender As Object, ByVal e As System.EventArgs)
RaiseEvent DataChanging(Me, New EventArgs)
End Sub
Public Overridable Sub OnDataChanged(ByVal sender As Object, ByVal e As System.EventArgs)
RaiseEvent DataChanged(Me, New EventArgs)
End Sub
End Class
--------------------------------------------------------------------------------
Option Strict Off
Imports System.ComponentModel
Imports System.ComponentModel.Design
Imports System.Drawing
Imports System.Reflection
Public Class myTextBox
Inherits System.Windows.Forms.TextBox
Dim m_ObjectName As String
<EditorBrowsable(EditorBrowsableState.Always), _
Browsable(True), _
Category("Notify"), _
Description("Name of the Object to bind to.")> _
Public Property ObjectName() As String
Get
Return m_ObjectName
End Get
Set(ByVal Value As String)
m_ObjectName = Value
BindData()
End Set
End Property
Dim m_PropertyName As String = "Text"
<EditorBrowsable(EditorBrowsableState.Always), _
Browsable(True), _
Category("Notify"), _
Description("Name of the Property to bind to.")> _
Public Property PropertyName() As String
Get
Return m_PropertyName
End Get
Set(ByVal Value As String)
m_PropertyName = Value
BindData()
End Set
End Property
Private Sub BindData()
Dim o As Object = Me.GetContainerControl
If IsNothing(o) Then Exit Sub
' Sentinel: Only do this at runtime
If Me.DesignMode Then Exit Sub
' Sentinel: Check if we can bind
If IsNothing(m_ObjectName) Or IsNothing(m_PropertyName) Then Exit Sub
' Get a reference to the DataObject
' We can not use "Me.TopLevelControl.GetType()" because that would return the MDI
' in a MDI-Application
' So search for the containing form:
Dim frm As System.Windows.Forms.Control = Me.Parent
Do While Not frm.GetType.BaseType.Equals(GetType(System.Windows .Forms.Form))
frm = frm.Parent
Debug.WriteLine(frm.GetType.BaseType)
Debug.WriteLine(GetType(System.Windows.Forms.Form) .ToString)
Loop
Dim myDataObject As Object
Dim t As Type = frm.GetType
Dim fi As FieldInfo()
Dim f As FieldInfo
fi = t.GetFields(BindingFlags.NonPublic Or BindingFlags.Instance Or BindingFlags.Public)
For Each f In fi
If f.FieldType.ToString = "SimonData." & m_ObjectName Then
' we've found the right DataObject (If there's only One per form (of that type))
Debug.WriteLine(CType(f.Name, String) + ": " + f.ToString)
' This is a NEW instance, so basically this is wrong
' but I think you have an idea now where to dig.
myDataObject = Activator.CreateInstance(f.FieldType(), True)
End If
Next
' Sentinel: The Object-Retieval failed
If IsNothing(myDataObject) Then Exit Sub
' Set the Binding
Dim myBinding As New System.Windows.Forms.Binding(m_PropertyName, myDataObject, "Data")
' Clear previous bindings (just in case)
Me.DataBindings.Clear() ' This is a bit drastic, you should only remove the one with the right Property
' Add the Binding
Me.DataBindings.Add(myBinding)
''''''''''''
''' TEST '''
''''''''''''
Dim s As String
s += "Binding set for: " & Me.Name.ToString + vbCrLf
s += "Property: " & m_PropertyName.ToString + vbCrLf
s += "DataSource: " & myDataObject.GetType.Name.ToString + vbCrLf
s += "Path: Data"
MsgBox(s)
''''''''''''
''' TEST '''
''''''''''''
End Sub
Private Sub myTextBox_ParentChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.ParentChanged
BindData()
End Sub
End Class
Michael,
Thanks for the time and effort! I'll play with this tonight. Look out for my next post!!!
I must admit that I do find reflection confusing!!! I just don't use it enough... I always end up cutting and pasting examples without really looking at *WHY* they work!
Regards
Simon
"Michael Maes" <mi*****@merlot.com> wrote in message news:eu**************@tk2msftngp13.phx.gbl...
Hi Simon,
I haven't got the time to get it to work fully (I think the approach is not right), but I guess you'll have a good "manual" with this code.
I have three classes:
a.. Simon (Testform)
b.. SimonData (DataObject Vehicle & Airplane)
c.. SimonTextBox
Good luck with this and please ..... when you get this right, post the code to this thread, so others can have a good sample !!!!
Thanks,
Michael
------------------------------------------------------------------------------
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 myTextBox1 As Simon.myTextBox
Friend WithEvents MyTextBox1 As SimonTextBox.myTextBox
Friend WithEvents MyTextBox2 As SimonTextBox.myTextBox
Friend WithEvents MyTextBox3 As SimonTextBox.myTextBox
Friend WithEvents Label1 As System.Windows.Forms.Label
Friend WithEvents Label2 As System.Windows.Forms.Label
Friend WithEvents Label3 As System.Windows.Forms.Label
Friend WithEvents Label4 As System.Windows.Forms.Label
Friend WithEvents MyTextBox4 As SimonTextBox.myTextBox
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
Me.Button1 = New System.Windows.Forms.Button
Me.MyTextBox1 = New SimonTextBox.myTextBox
Me.MyTextBox2 = New SimonTextBox.myTextBox
Me.MyTextBox3 = New SimonTextBox.myTextBox
Me.Label1 = New System.Windows.Forms.Label
Me.Label2 = New System.Windows.Forms.Label
Me.Label3 = New System.Windows.Forms.Label
Me.Label4 = New System.Windows.Forms.Label
Me.MyTextBox4 = New SimonTextBox.myTextBox
Me.SuspendLayout()
'
'Button1
'
Me.Button1.Location = New System.Drawing.Point(200, 209)
Me.Button1.Name = "Button1"
Me.Button1.TabIndex = 1
Me.Button1.Text = "Button1"
'
'MyTextBox1
'
Me.MyTextBox1.Location = New System.Drawing.Point(30, 33)
Me.MyTextBox1.Name = "MyTextBox1"
Me.MyTextBox1.ObjectName = "Vehicle"
Me.MyTextBox1.PropertyName = "Text"
Me.MyTextBox1.TabIndex = 2
Me.MyTextBox1.Text = "MyTextBox1"
'
'MyTextBox2
'
Me.MyTextBox2.Location = New System.Drawing.Point(30, 66)
Me.MyTextBox2.Name = "MyTextBox2"
Me.MyTextBox2.ObjectName = ""
Me.MyTextBox2.PropertyName = ""
Me.MyTextBox2.TabIndex = 2
Me.MyTextBox2.Text = "MyTextBox2"
'
'MyTextBox3
'
Me.MyTextBox3.Location = New System.Drawing.Point(30, 99)
Me.MyTextBox3.Name = "MyTextBox3"
Me.MyTextBox3.ObjectName = "Airplane"
Me.MyTextBox3.PropertyName = "Text"
Me.MyTextBox3.TabIndex = 2
Me.MyTextBox3.Text = "MyTextBox3"
'
'Label1
'
Me.Label1.Location = New System.Drawing.Point(140, 33)
Me.Label1.Name = "Label1"
Me.Label1.Size = New System.Drawing.Size(140, 23)
Me.Label1.TabIndex = 3
Me.Label1.Text = "Bound to Vehicle"
Me.Label1.TextAlign = System.Drawing.ContentAlignment.MiddleLeft
'
'Label2
'
Me.Label2.Location = New System.Drawing.Point(140, 66)
Me.Label2.Name = "Label2"
Me.Label2.Size = New System.Drawing.Size(140, 23)
Me.Label2.TabIndex = 3
Me.Label2.Text = "Not Bound"
Me.Label2.TextAlign = System.Drawing.ContentAlignment.MiddleLeft
'
'Label3
'
Me.Label3.Location = New System.Drawing.Point(140, 99)
Me.Label3.Name = "Label3"
Me.Label3.Size = New System.Drawing.Size(140, 23)
Me.Label3.TabIndex = 3
Me.Label3.Text = "Bound to Airplane"
Me.Label3.TextAlign = System.Drawing.ContentAlignment.MiddleLeft
'
'Label4
'
Me.Label4.Location = New System.Drawing.Point(140, 132)
Me.Label4.Name = "Label4"
Me.Label4.Size = New System.Drawing.Size(140, 23)
Me.Label4.TabIndex = 3
Me.Label4.Text = """Bound"" to Illegal Object"
Me.Label4.TextAlign = System.Drawing.ContentAlignment.MiddleLeft
'
'MyTextBox4
'
Me.MyTextBox4.Location = New System.Drawing.Point(30, 132)
Me.MyTextBox4.Name = "MyTextBox4"
Me.MyTextBox4.ObjectName = "Boat"
Me.MyTextBox4.PropertyName = "Text"
Me.MyTextBox4.TabIndex = 2
Me.MyTextBox4.Text = "MyTextBox4"
'
'Form1
'
Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
Me.ClientSize = New System.Drawing.Size(292, 266)
Me.Controls.Add(Me.Label1)
Me.Controls.Add(Me.MyTextBox1)
Me.Controls.Add(Me.Button1)
Me.Controls.Add(Me.MyTextBox2)
Me.Controls.Add(Me.MyTextBox3)
Me.Controls.Add(Me.Label2)
Me.Controls.Add(Me.Label3)
Me.Controls.Add(Me.Label4)
Me.Controls.Add(Me.MyTextBox4)
Me.Name = "Form1"
Me.Text = "Form1"
Me.ResumeLayout(False)
End Sub
#End Region
' Dim Vehicle As New Vehicle
' You need to listen for events: WithEvents
Dim WithEvents Vehicle As SimonData.Vehicle
Dim WithEvents Airplane As SimonData.Airplane
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
InitializeDataObjects()
End Sub
#Region " Instantiation "
Private Sub InitializeDataObjects()
Vehicle = New SimonData.Vehicle
Airplane = New SimonData.Airplane
End Sub
#End Region
'Dim DataValues As String
'Private Sub Vehicle_DataChanging(ByVal sender As Object, ByVal e As System.EventArgs) Handles Vehicle.DataChanging
' DataValues = "Old value: " & Vehicle.Data.ToString
'End Sub
'Private Sub Vehicle_DataChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles Vehicle.DataChanged
' DataValues += vbCrLf & "New value: " & Vehicle.Data.ToString
' MsgBox(DataValues)
'End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim s As String
s += "Vehicle = " & Me.Vehicle.Data.ToString + vbCrLf
s += "Airplane = " & Me.Airplane.Data.ToString
MsgBox(s)
End Sub
End Class
------------------------------------------------------------------------------
Option Strict Off
Public Class Vehicle
'Implements System.ComponentModel.IBindingList
Private dat As String = "Hello Vehicle"
'Event DataChanged As EventHandler SCOPE YOUR EVENT
Public Event DataChanged As EventHandler
Public Event DataChanging As EventHandler
Public Property Data()
Get
Return dat
End Get
Set(ByVal Value)
Debug.WriteLine("Data Set for Vehicle") : Beep()
If dat = Value Then
' Nothing has changed, so skip all the processing!
Exit Property
End If
OnDataChanging(Me, New EventArgs)
dat = Value
' RaiseEvent DataChanged(Me, New EventArgs)
' THIS IS NOT DONE: DON'T RAISE AN EVENT DIRECTLY
' USE A "On" + EVENT SUB (Convention)
OnDataChanged(Me, New EventArgs)
End Set
End Property
Public Overridable Sub OnDataChanging(ByVal sender As Object, ByVal e As System.EventArgs)
RaiseEvent DataChanging(Me, New EventArgs)
End Sub
Public Overridable Sub OnDataChanged(ByVal sender As Object, ByVal e As System.EventArgs)
RaiseEvent DataChanged(Me, New EventArgs)
End Sub
End Class
************************************************** ***************
Option Strict Off
Public Class Airplane
Private dat As String = "Hello Airplane"
'Event DataChanged As EventHandler SCOPE YOUR EVENT
Public Event DataChanged As EventHandler
Public Event DataChanging As EventHandler
Public Property Data()
Get
Return dat
End Get
Set(ByVal Value)
Debug.WriteLine("Data Set for Vehicle") : Beep()
If dat = Value Then
' Nothing has changed, so skip all the processing!
Exit Property
End If
OnDataChanging(Me, New EventArgs)
dat = Value
' RaiseEvent DataChanged(Me, New EventArgs)
' THIS IS NOT DONE: DON'T RAISE AN EVENT DIRECTLY
' USE A "On" + EVENT SUB (Convention)
OnDataChanged(Me, New EventArgs)
End Set
End Property
Public Overridable Sub OnDataChanging(ByVal sender As Object, ByVal e As System.EventArgs)
RaiseEvent DataChanging(Me, New EventArgs)
End Sub
Public Overridable Sub OnDataChanged(ByVal sender As Object, ByVal e As System.EventArgs)
RaiseEvent DataChanged(Me, New EventArgs)
End Sub
End Class
------------------------------------------------------------------------------
Option Strict Off
Imports System.ComponentModel
Imports System.ComponentModel.Design
Imports System.Drawing
Imports System.Reflection
Public Class myTextBox
Inherits System.Windows.Forms.TextBox
Dim m_ObjectName As String
<EditorBrowsable(EditorBrowsableState.Always), _
Browsable(True), _
Category("Notify"), _
Description("Name of the Object to bind to.")> _
Public Property ObjectName() As String
Get
Return m_ObjectName
End Get
Set(ByVal Value As String)
m_ObjectName = Value
BindData()
End Set
End Property
Dim m_PropertyName As String = "Text"
<EditorBrowsable(EditorBrowsableState.Always), _
Browsable(True), _
Category("Notify"), _
Description("Name of the Property to bind to.")> _
Public Property PropertyName() As String
Get
Return m_PropertyName
End Get
Set(ByVal Value As String)
m_PropertyName = Value
BindData()
End Set
End Property
Private Sub BindData()
Dim o As Object = Me.GetContainerControl
If IsNothing(o) Then Exit Sub
' Sentinel: Only do this at runtime
If Me.DesignMode Then Exit Sub
' Sentinel: Check if we can bind
If IsNothing(m_ObjectName) Or IsNothing(m_PropertyName) Then Exit Sub
' Get a reference to the DataObject
' We can not use "Me.TopLevelControl.GetType()" because that would return the MDI
' in a MDI-Application
' So search for the containing form:
Dim frm As System.Windows.Forms.Control = Me.Parent
Do While Not frm.GetType.BaseType.Equals(GetType(System.Windows .Forms.Form))
frm = frm.Parent
Debug.WriteLine(frm.GetType.BaseType)
Debug.WriteLine(GetType(System.Windows.Forms.Form) .ToString)
Loop
Dim myDataObject As Object
Dim t As Type = frm.GetType
Dim fi As FieldInfo()
Dim f As FieldInfo
fi = t.GetFields(BindingFlags.NonPublic Or BindingFlags.Instance Or BindingFlags.Public)
For Each f In fi
If f.FieldType.ToString = "SimonData." & m_ObjectName Then
' we've found the right DataObject (If there's only One per form (of that type))
Debug.WriteLine(CType(f.Name, String) + ": " + f.ToString)
' This is a NEW instance, so basically this is wrong
' but I think you have an idea now where to dig.
myDataObject = Activator.CreateInstance(f.FieldType(), True)
End If
Next
' Sentinel: The Object-Retieval failed
If IsNothing(myDataObject) Then Exit Sub
' Set the Binding
Dim myBinding As New System.Windows.Forms.Binding(m_PropertyName, myDataObject, "Data")
' Clear previous bindings (just in case)
Me.DataBindings.Clear() ' This is a bit drastic, you should only remove the one with the right Property
' Add the Binding
Me.DataBindings.Add(myBinding)
''''''''''''
''' TEST '''
''''''''''''
Dim s As String
s += "Binding set for: " & Me.Name.ToString + vbCrLf
s += "Property: " & m_PropertyName.ToString + vbCrLf
s += "DataSource: " & myDataObject.GetType.Name.ToString + vbCrLf
s += "Path: Data"
MsgBox(s)
''''''''''''
''' TEST '''
''''''''''''
End Sub
Private Sub myTextBox_ParentChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.ParentChanged
BindData()
End Sub
End Class
Of course!!
I made one "Mistake".....
replace
\\\\
Sub BindData()
' myDataObject = Activator.CreateInstance(f.FieldType(), True) - DROP THIS
myDataObject = f.GetValue(frm)
End Sub
////
I didn't pay attention that the TextBoxes get Instantiated BEFORE the DataObjects are created on the Form.
So basically the problem is that 'BindData' has to be called after the "InitializeComponents"!
You could obtain this (= quick work-arround) by setting the "ObjectName" after the Sub InitializeDataObjects.
Let me know your findings!
Michael
REVISED TEST-FORM
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 myTextBox1 As Simon.myTextBox
Friend WithEvents MyTextBox1 As SimonTextBox.myTextBox
Friend WithEvents MyTextBox2 As SimonTextBox.myTextBox
Friend WithEvents MyTextBox3 As SimonTextBox.myTextBox
Friend WithEvents Label1 As System.Windows.Forms.Label
Friend WithEvents Label2 As System.Windows.Forms.Label
Friend WithEvents Label3 As System.Windows.Forms.Label
Friend WithEvents Label4 As System.Windows.Forms.Label
Friend WithEvents MyTextBox4 As SimonTextBox.myTextBox
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
Me.MyTextBox1 = New SimonTextBox.myTextBox
Me.MyTextBox2 = New SimonTextBox.myTextBox
Me.MyTextBox3 = New SimonTextBox.myTextBox
Me.Label1 = New System.Windows.Forms.Label
Me.Label2 = New System.Windows.Forms.Label
Me.Label3 = New System.Windows.Forms.Label
Me.Label4 = New System.Windows.Forms.Label
Me.MyTextBox4 = New SimonTextBox.myTextBox
Me.SuspendLayout()
'
'MyTextBox1
'
Me.MyTextBox1.Location = New System.Drawing.Point(30, 33)
Me.MyTextBox1.Name = "MyTextBox1"
Me.MyTextBox1.ObjectName = Nothing
Me.MyTextBox1.PropertyName = "Text"
Me.MyTextBox1.TabIndex = 2
Me.MyTextBox1.Text = "MyTextBox1"
'
'MyTextBox2
'
Me.MyTextBox2.Location = New System.Drawing.Point(30, 66)
Me.MyTextBox2.Name = "MyTextBox2"
Me.MyTextBox2.ObjectName = Nothing
Me.MyTextBox2.PropertyName = ""
Me.MyTextBox2.TabIndex = 2
Me.MyTextBox2.Text = "MyTextBox2"
'
'MyTextBox3
'
Me.MyTextBox3.Location = New System.Drawing.Point(30, 99)
Me.MyTextBox3.Name = "MyTextBox3"
Me.MyTextBox3.ObjectName = Nothing
Me.MyTextBox3.PropertyName = "Text"
Me.MyTextBox3.TabIndex = 2
Me.MyTextBox3.Text = "MyTextBox3"
'
'Label1
'
Me.Label1.Location = New System.Drawing.Point(140, 33)
Me.Label1.Name = "Label1"
Me.Label1.Size = New System.Drawing.Size(140, 23)
Me.Label1.TabIndex = 3
Me.Label1.Text = "Bound to Vehicle"
Me.Label1.TextAlign = System.Drawing.ContentAlignment.MiddleLeft
'
'Label2
'
Me.Label2.Location = New System.Drawing.Point(140, 66)
Me.Label2.Name = "Label2"
Me.Label2.Size = New System.Drawing.Size(140, 23)
Me.Label2.TabIndex = 3
Me.Label2.Text = "Not Bound"
Me.Label2.TextAlign = System.Drawing.ContentAlignment.MiddleLeft
'
'Label3
'
Me.Label3.Location = New System.Drawing.Point(140, 99)
Me.Label3.Name = "Label3"
Me.Label3.Size = New System.Drawing.Size(140, 23)
Me.Label3.TabIndex = 3
Me.Label3.Text = "Bound to Airplane"
Me.Label3.TextAlign = System.Drawing.ContentAlignment.MiddleLeft
'
'Label4
'
Me.Label4.Location = New System.Drawing.Point(140, 132)
Me.Label4.Name = "Label4"
Me.Label4.Size = New System.Drawing.Size(140, 23)
Me.Label4.TabIndex = 3
Me.Label4.Text = """Bound"" to Illegal Object"
Me.Label4.TextAlign = System.Drawing.ContentAlignment.MiddleLeft
'
'MyTextBox4
'
Me.MyTextBox4.Location = New System.Drawing.Point(30, 132)
Me.MyTextBox4.Name = "MyTextBox4"
Me.MyTextBox4.ObjectName = Nothing
Me.MyTextBox4.PropertyName = "Text"
Me.MyTextBox4.TabIndex = 2
Me.MyTextBox4.Text = "MyTextBox4"
'
'Form1
'
Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
Me.ClientSize = New System.Drawing.Size(292, 266)
Me.Controls.Add(Me.Label1)
Me.Controls.Add(Me.MyTextBox1)
Me.Controls.Add(Me.MyTextBox2)
Me.Controls.Add(Me.MyTextBox3)
Me.Controls.Add(Me.Label2)
Me.Controls.Add(Me.Label3)
Me.Controls.Add(Me.Label4)
Me.Controls.Add(Me.MyTextBox4)
Me.Name = "Form1"
Me.Text = "Form1"
Me.ResumeLayout(False)
End Sub
#End Region
' Dim Vehicle As New Vehicle
' You need to listen for events: WithEvents
Dim WithEvents Vehicle As SimonData.Vehicle
Dim WithEvents Airplane As SimonData.Airplane
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
InitializeDataObjects()
BindTextBoxes()
End Sub
#Region " Instantiation "
Private Sub InitializeDataObjects()
Vehicle = New SimonData.Vehicle
Airplane = New SimonData.Airplane
End Sub
#End Region
Private Sub BindTextBoxes()
Me.MyTextBox1.ObjectName = "Vehicle"
Me.MyTextBox2.ObjectName = ""
Me.MyTextBox3.ObjectName = "Airplane"
Me.MyTextBox4.ObjectName = "Boat"
End Sub
Dim DataValues As String
Private Sub Vehicle_DataChanging(ByVal sender As Object, ByVal e As System.EventArgs) Handles Vehicle.DataChanging, Airplane.DataChanging
DataValues = "Vehicle - Old value: " & Vehicle.Data.ToString
DataValues += vbCrLf & "Airplane - Old value: " & Airplane.Data.ToString
End Sub
Private Sub Vehicle_DataChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles Vehicle.DataChanged, Airplane.DataChanged
DataValues += vbCrLf & "Vehicle - New value: " & Vehicle.Data.ToString
DataValues += vbCrLf & "Airplane - New value: " & Airplane.Data.ToString
MsgBox(DataValues)
End Sub
End Class
Simon,
Have Fun (my last post works)
Do keep in mind however that Reflection IS really SLOW !
Regards,
Michael
"Simon Verona" <ne**@aphroditeuk.com> wrote in message news:uS**************@TK2MSFTNGP12.phx.gbl...
Michael,
Thanks for the time and effort! I'll play with this tonight. Look out for my next post!!!
I must admit that I do find reflection confusing!!! I just don't use it enough... I always end up cutting and pasting examples without really looking at *WHY* they work!
Regards
Simon
You should also delete the following Sub in the TextBox-Class:
Private Sub myTextBox_ParentChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.ParentChanged
BindData()
End Sub
Michael
"Michael Maes" <mi*****@merlot.com> wrote in message news:OJ**************@TK2MSFTNGP12.phx.gbl...
Of course!!
I made one "Mistake".....
replace
\\\\
Sub BindData()
' myDataObject = Activator.CreateInstance(f.FieldType(), True) - DROP THIS
myDataObject = f.GetValue(frm)
End Sub
////
I didn't pay attention that the TextBoxes get Instantiated BEFORE the DataObjects are created on the Form.
So basically the problem is that 'BindData' has to be called after the "InitializeComponents"!
You could obtain this (= quick work-arround) by setting the "ObjectName" after the Sub InitializeDataObjects.
Let me know your findings!
Michael
REVISED TEST-FORM
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 myTextBox1 As Simon.myTextBox
Friend WithEvents MyTextBox1 As SimonTextBox.myTextBox
Friend WithEvents MyTextBox2 As SimonTextBox.myTextBox
Friend WithEvents MyTextBox3 As SimonTextBox.myTextBox
Friend WithEvents Label1 As System.Windows.Forms.Label
Friend WithEvents Label2 As System.Windows.Forms.Label
Friend WithEvents Label3 As System.Windows.Forms.Label
Friend WithEvents Label4 As System.Windows.Forms.Label
Friend WithEvents MyTextBox4 As SimonTextBox.myTextBox
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
Me.MyTextBox1 = New SimonTextBox.myTextBox
Me.MyTextBox2 = New SimonTextBox.myTextBox
Me.MyTextBox3 = New SimonTextBox.myTextBox
Me.Label1 = New System.Windows.Forms.Label
Me.Label2 = New System.Windows.Forms.Label
Me.Label3 = New System.Windows.Forms.Label
Me.Label4 = New System.Windows.Forms.Label
Me.MyTextBox4 = New SimonTextBox.myTextBox
Me.SuspendLayout()
'
'MyTextBox1
'
Me.MyTextBox1.Location = New System.Drawing.Point(30, 33)
Me.MyTextBox1.Name = "MyTextBox1"
Me.MyTextBox1.ObjectName = Nothing
Me.MyTextBox1.PropertyName = "Text"
Me.MyTextBox1.TabIndex = 2
Me.MyTextBox1.Text = "MyTextBox1"
'
'MyTextBox2
'
Me.MyTextBox2.Location = New System.Drawing.Point(30, 66)
Me.MyTextBox2.Name = "MyTextBox2"
Me.MyTextBox2.ObjectName = Nothing
Me.MyTextBox2.PropertyName = ""
Me.MyTextBox2.TabIndex = 2
Me.MyTextBox2.Text = "MyTextBox2"
'
'MyTextBox3
'
Me.MyTextBox3.Location = New System.Drawing.Point(30, 99)
Me.MyTextBox3.Name = "MyTextBox3"
Me.MyTextBox3.ObjectName = Nothing
Me.MyTextBox3.PropertyName = "Text"
Me.MyTextBox3.TabIndex = 2
Me.MyTextBox3.Text = "MyTextBox3"
'
'Label1
'
Me.Label1.Location = New System.Drawing.Point(140, 33)
Me.Label1.Name = "Label1"
Me.Label1.Size = New System.Drawing.Size(140, 23)
Me.Label1.TabIndex = 3
Me.Label1.Text = "Bound to Vehicle"
Me.Label1.TextAlign = System.Drawing.ContentAlignment.MiddleLeft
'
'Label2
'
Me.Label2.Location = New System.Drawing.Point(140, 66)
Me.Label2.Name = "Label2"
Me.Label2.Size = New System.Drawing.Size(140, 23)
Me.Label2.TabIndex = 3
Me.Label2.Text = "Not Bound"
Me.Label2.TextAlign = System.Drawing.ContentAlignment.MiddleLeft
'
'Label3
'
Me.Label3.Location = New System.Drawing.Point(140, 99)
Me.Label3.Name = "Label3"
Me.Label3.Size = New System.Drawing.Size(140, 23)
Me.Label3.TabIndex = 3
Me.Label3.Text = "Bound to Airplane"
Me.Label3.TextAlign = System.Drawing.ContentAlignment.MiddleLeft
'
'Label4
'
Me.Label4.Location = New System.Drawing.Point(140, 132)
Me.Label4.Name = "Label4"
Me.Label4.Size = New System.Drawing.Size(140, 23)
Me.Label4.TabIndex = 3
Me.Label4.Text = """Bound"" to Illegal Object"
Me.Label4.TextAlign = System.Drawing.ContentAlignment.MiddleLeft
'
'MyTextBox4
'
Me.MyTextBox4.Location = New System.Drawing.Point(30, 132)
Me.MyTextBox4.Name = "MyTextBox4"
Me.MyTextBox4.ObjectName = Nothing
Me.MyTextBox4.PropertyName = "Text"
Me.MyTextBox4.TabIndex = 2
Me.MyTextBox4.Text = "MyTextBox4"
'
'Form1
'
Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
Me.ClientSize = New System.Drawing.Size(292, 266)
Me.Controls.Add(Me.Label1)
Me.Controls.Add(Me.MyTextBox1)
Me.Controls.Add(Me.MyTextBox2)
Me.Controls.Add(Me.MyTextBox3)
Me.Controls.Add(Me.Label2)
Me.Controls.Add(Me.Label3)
Me.Controls.Add(Me.Label4)
Me.Controls.Add(Me.MyTextBox4)
Me.Name = "Form1"
Me.Text = "Form1"
Me.ResumeLayout(False)
End Sub
#End Region
' Dim Vehicle As New Vehicle
' You need to listen for events: WithEvents
Dim WithEvents Vehicle As SimonData.Vehicle
Dim WithEvents Airplane As SimonData.Airplane
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
InitializeDataObjects()
BindTextBoxes()
End Sub
#Region " Instantiation "
Private Sub InitializeDataObjects()
Vehicle = New SimonData.Vehicle
Airplane = New SimonData.Airplane
End Sub
#End Region
Private Sub BindTextBoxes()
Me.MyTextBox1.ObjectName = "Vehicle"
Me.MyTextBox2.ObjectName = ""
Me.MyTextBox3.ObjectName = "Airplane"
Me.MyTextBox4.ObjectName = "Boat"
End Sub
Dim DataValues As String
Private Sub Vehicle_DataChanging(ByVal sender As Object, ByVal e As System.EventArgs) Handles Vehicle.DataChanging, Airplane.DataChanging
DataValues = "Vehicle - Old value: " & Vehicle.Data.ToString
DataValues += vbCrLf & "Airplane - Old value: " & Airplane.Data.ToString
End Sub
Private Sub Vehicle_DataChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles Vehicle.DataChanged, Airplane.DataChanged
DataValues += vbCrLf & "Vehicle - New value: " & Vehicle.Data.ToString
DataValues += vbCrLf & "Airplane - New value: " & Airplane.Data.ToString
MsgBox(DataValues)
End Sub
End Class
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