How to Pass Additional Parameters When Calling and Event VB.net - vb.net

Question

Public Event DocumentCompleted As WebBrowserDocumentCompletedEventHandler
Dim arg() As Object = {homeTeam, guestTeam}
AddHandler browser.DocumentCompleted, New
WebBrowserDocumentCompletedEventHandler(AddressOf DoStuff)
Private Sub DoStuff(ByVal sender As Object, ByVal e As WebBrowserDocumentCompletedEventArgs)
End Sub
How can I pass the homeTeam and guestTeam when firing the DocumentCompleted event.
I want to ge the above to values to inside the Dostuff method.
Please help.

Answer 1

First of all, you cannot have this hanging in the middle of nowhere:
Dim arg() As Object = {homeTeam, guestTeam}
AddHandler browser.DocumentCompleted,
New WebBrowserDocumentCompletedEventHandler(AddressOf DoStuff)
AddHandler probably needs to be in some Initialize method, which could be inside Sub New, after InitializeComponent, or inside Form_Load, or as soon as you expect it to be triggered (after a specific event). Notice here that you are using a default event of a native .NET component, with a default event type. In this case you cannot directly consume anything other than what it already provides, when triggered. See WebBrowser.DocumentCompleted Event on MSDN.
You can, however, override all relevant classes and have your own MyWebBrowser control and your own event, with would contain additional properties. See below example:
Public Class Form1
Sub New()
' This call is required by the designer.
InitializeComponent()
Dim browser As New MyWebBrowser
AddHandler browser.MyDocumentCompleted, AddressOf DoStuff
End Sub
Private Sub DoStuff(ByVal sender As Object, ByVal e As MyWebBrowserDocumentCompletedArgs)
Dim guestTeam As String = e.GuestTeam 'guest team
Dim homeTeam As String = e.HomeTeam 'and home team are both accessible
'so you can do some processing on them
End Sub
Public Class MyWebBrowserDocumentCompletedArgs : Inherits WebBrowserDocumentCompletedEventArgs
Dim _homeTeam As String
Dim _guestTeam As String
Public ReadOnly Property HomeTeam
Get
Return _homeTeam
End Get
End Property
Public ReadOnly Property GuestTeam
Get
Return _guestTeam
End Get
End Property
Sub New(url As Uri, homeTeam As String, guestTeam As String)
MyBase.New(url)
_homeTeam = homeTeam
_guestTeam = guestTeam
End Sub
End Class
Public Class MyWebBrowser : Inherits WebBrowser
Public Delegate Sub MyWebBrowserDocumentCompletedEventHandler(e As MyWebBrowserDocumentCompletedArgs)
Public Event MyDocumentCompleted As MyWebBrowserDocumentCompletedEventHandler
Protected Overrides Sub OnDocumentCompleted(e As System.Windows.Forms.WebBrowserDocumentCompletedEventArgs)
MyBase.OnDocumentCompleted(e)
'homeTeam and guestTeam need to be extracted from the current instance of MyWebBrowser, and passed further
RaiseEvent MyDocumentCompleted(New MyWebBrowserDocumentCompletedArgs(e.Url, "homeTeam", "guestTeam"))
End Sub
End Class
End Class
If your project is relatively small, you can indeed have those as global variables, as #Vlad suggested in the comments.