I am trying to create a clone of an object instance.
Creating the new instance and copying property values is no problem but the original object instance has some event handlers assigned to its events. How can I copy event handlers to the new instance?
Thanks..
Here is a code sample...
Public Sub ButtonClick(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
MessageBox.Show(sender.Name + "was clicked")
End Sub
Public Sub CloneButton()
Dim newButton = New Button
newButton.Name = Button1.Name + "_Clone"
newButton.Text = Button1.Text
newButton.Width = Button1.Width
newButton.Height = Button1.Height
'Some code here to copy Button1's event handler ButtonClick,
'so when the new button is clicked "Button1_Clone was clicked" is displayed.
End Sub
This is freakin' old, I know, but I can't believe this guy didn't get an answer, it's been answered on SO before, right here.
Just one thing; in the example code given, miHandler will be Nothing if there is no event handler attached to the sourceObject, you should test for that.
Related
I'm in the process of converting some outlook VBA macros to an Add-in. I am having difficulty with my macros that create emails based on a template. I decided to code a simple button to create and display a new email with the subject test.
Everything is working up to displaying the email which doesn't happen.
Private Sub ButtonGenEmail_Click(sender As Object, e As EventArgs) Handles ButtonGenEmail.Click
Me.Close()
Dim objApp As Outlook.Application
Dim objMail As Outlook.MailItem
objApp = Globals.ThisAddIn.Application
objMail = objApp.CreateItem(Microsoft.Office.Interop.Outlook.OlItemType.olMailItem)
objMail.Subject = "test"
objMail.Save()
objMail.Display(False)
End Sub
At one point I added msgbox "Done" after objMail.Display(False) and the message never appears.
Thanks in advance
This should obviously work. I'm not so skilled in Outlook but I guess the problem here is that you run it from a form (I see the Me.Close)
Isn't then Outlook blocking to display the mail because the form is still open (I guess modal = ShowDialog())?
I think you will have to either change the form to be not modal (use Show() instead of ShowDialog()) or handle the event after the form is closed, something like
All code below written from top of my mind, so I may miss something
A method from where you initialize the form
Dim frm as new YourForm()
frm.ShowDialog()
if frm.MyState = TheyClickOnButton Then
' Run your mailItem code here
End If
in the form code
Public Enum State
Unknown = 0
TheyClickedOnButton
End Enum
Public Property MyState as State
Private Sub ButtonGenEmail_Click(sender As Object, e As EventArgs) Handles ButtonGenEmail.Click
MyState = TheyClickedOnButton
Me.Close()
End Sub
What I would like to do is after clicking the button14 which is login it would change all the button in all forms text to "sample" I already change the class where the button2 is from private to public but I still get an error
Public Sub button14_Click(sender As Object, e As EventArgs) Handles button14.Click
If textBox2.Text = "sample" And textBox3.Text = "****" Then
Form1.Show()
Me.Hide()
button2.Text = ("sample")
Form1.button2.Text = ("sample")
Else
MsgBox("Sorry, Username or password not found", MsgBoxStyle.OkOnly, "Invalid")
textBox2.Text = " "
textBox3.Text = " "
End If
End Sub
this is form 1
Public Sub button2_Click(sender As Object, e As EventArgs) Handles button2.Click
Login.Show()
Me.Hide()
End Sub
Do people still write VB code? Anyway, the error message is quite clear. You need to make the button public (not just the class).
But, for security reasons, instead of making the button public...I would recommend you to expose a method to change the text of the button, after all, that's all you're doing. You can even mark this method with the Friend access modifier...I think it is the same as internal in C#?
My guess this is winform project.
You can change the access modifier of your button in the form designer. Select your button press F4 for the property grid, find Modifiers and change it to whatever.
I am new here. So apologize in advance if not wording question properly.
I am developing an application (VS2013, Visual Basic) that using multiple menu items in the MenuStrip. When item is clicked the identical function is called - the Tab is created and appropriate form is loaded.
i.e.
Private Sub XXXMNU0039_Click(sender As Object, e As EventArgs) Handles XXXMNU0039.Click
Dim f1 As New frm_B05_01_SalesQuotes
Dim imgnm As String = "XXXMNU0039"
Call XXXTabPages("Sales Quotes", f1, imgnm)
End Sub
Private Sub XXXMNU0040_Click(sender As Object, e As EventArgs) Handles XXXMNU0040.Click
Dim f1 As New frm_B05_03_SalesQuotesReports
Dim imgnm As String = "XXXMNU_Reports"
Call XXXTabPages("Sales Quotes Reports", f1, imgnm)
End Sub
....
I am wondering is there is a way to create a "global" default "on click event" for all menu items that will accomplish the same thing by default. I have all the relevant information for each menu item stored in a table and hope to avoid creating "on click" for each item.
Thanks in advance.
You could have the same handler for the click event of your ToolStripMenuItems.
Just add, after the first Handles XXXMNU0039.Click the event to handle for another ToolStripMenuItem and so on
Oviously, then problem is how to differentiate the various ToolStripMenuItem that calls the same event handler. But in the event arguments there is the Sender object that represent the current ToolStripMenuItem that has called the event.
Just DirectCast to a ToolStripMenuItem and read its name to pass the correct parameter to the XXXTablPages method
Private Sub menuItemHandler_Click(sender As Object, e As EventArgs) _
Handles XXXMNU0039.Click, XXXMNU0040.Click
Dim f1 As New frm_B05_01_SalesQuotes
Dim itm = DirectCast(sender, ToolStripMenuItem)
Dim imgnm As String = item.Name
Call XXXTabPages("Sales Quotes", f1, imgnm)
End Sub
I use several instances (myForm1, myForm2,etc...) of the same MDIChild form (frmChart) to display different MSCharts:
frmMain:
Private Sub Open()
dim myForm1 as frmChart
myForm1.Show
dim myForm2 as frmChart
myForm2.Show
End sub
The problem happens when I try to save the MSChart of one opened instance, because I call a frmChart.SaveChart() function which resizes a picturebox and then the Form_Load() event is invoked, so a new extra frmChart is opened.
frmChart:
Public Sub SaveChart()
picGrapgh.Height = chChart.Height
picGrapgh.Width = chChart.Width
picGraph.Autoredraw = True
picGraph.Picture = picGraph.Image
SavePicture picGraph.picture, FileName
End Sub
When I call that sub, it invokes the Form_Load() of the frmChart. This only happens when I use form instances (myForm1). Once I use any property of the PictureBox control of the frmChart it launches the Form_Load event. How could I prevent it?.
Thank you very much in advance.
Regards,
Ruben
There are 2 problems:
dim myForm1 as frmChart
This just declares that myForm1 will be of the Type frmChart if/when one is created (instanced). To create an actual instance of frmChart:
dim myForm1 as New frmChart
Since myFormN is now an instance of frmChart, you can call those procedures directly on/thru the instance variable:
myForm1.SaveChart
I'm customising the Group Headers on a Telerik RadGrid by injecting a LinkButton into it during the ItemDataBound event. The button renders perfectly, but I can't get it to hit any event handlers.
Here is the code for the button creation:
Private Sub rgWorkRequestItemCosts_ItemDataBound(ByVal sender As Object, ByVal e As Telerik.Web.UI.GridItemEventArgs) Handles rgWorkRequestItemCosts.ItemDataBound
If TypeOf e.Item Is GridGroupHeaderItem Then
Dim oItem As GridGroupHeaderItem = DirectCast(e.Item, GridGroupHeaderItem)
Dim lnkAdd As New LinkButton()
lnkAdd.ID = "lnkAdd"
lnkAdd.CommandName = "CustomAddWorkRequestItemCost"
lnkAdd.CommandArgument = DirectCast(oItem.DataItem, DataRowView).Row("nWorkRequestItemID").ToString()
lnkAdd.Text = String.Format("<img style=""border:0px"" alt="""" width=""12"" src=""{0}"" /> Add new cost", ResolveUrl(String.Format("~/App_Themes/{0}/Grid/AddRecord.gif", Page.Theme)))
lnkAdd.Style("color") = "#000000"
lnkAdd.Style("text-decoration") = "none"
AddHandler lnkAdd.Click, AddressOf lnkAdd_Click
Dim tcPlaceholder As GridTableCell = DirectCast(oItem.Controls(1), GridTableCell)
Dim litText As New LiteralControl(String.Format(" {0}", tcPlaceholder.Text))
tcPlaceholder.Text = String.Empty
tcPlaceholder.Controls.Add(lnkAdd)
tcPlaceholder.Controls.Add(litText)
End If
End Sub
This code explicitly adds a handler for the LinkButton, but that handler is never hit. I've also tried events on the RadGrid (ItemCommand, ItemEvent) but none seem to get hit.
Has anyone got any suggestions of other events to try, or ways to make this work?
Thanks!
I wasn't able to find a "nice" solution to this. In the end I did the following:
Created the button in the
ItemCreated event handler, setting
its CommandArgument to a counter
which was incremented for every
group header created
Again created the button in the
ItemDataBound event, again settings
its CommandArgument to the counter
value. At this point I added a
record to a dictionary object
(stored in ViewState) linking the
counter to the actual value of the
group.
Handled the click event of the
button, extracting the group value
from the dictionary in viewstate to
complete the processing.
Ugly, but it works.