CODEWITHSUNDEEP
vb.netmultithreadingbrowserctrl
Code_Seeker
Code_Seeker

Reputation: 1

Threading multiple WebBrowser in VB .net

I'm building a multiple webbrowser inside tabs( 1 predefine webbrowser control per tab) and I want them all to load at the same time or other words must run in thread. Unfortunately I feel a valid fact came from the error message that this is something not possible. Pls help me to check my simple program code below and its error in case i tried releasing 2 webbrowser controls but when I leave it to single web browser control it works fine. Any workaround? 

Imports System.Threading

Public Class Form1
Dim mythread1 As Thread
Dim mythread2 As Thread

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
mythread1 = New Thread(AddressOf mysub1)
mythread2 = New Thread(AddressOf mysub2)
mythread1.IsBackground = True
mythread2.IsBackground = True
mythread1.Start()
mythread2.Start()
End Sub

Public Sub mysub1()
Dim HTML As String
WebBrowser1.Navigate("about:blank")
mythread1.Abort()
End Sub
Public Sub mysub2()
WebBrowser2.Navigate("about:blank")
mythread2.Abort()
End Sub

Upvotes: 0

Views: 5308

Answers (2)

Chris Wheelous
Chris Wheelous

Reputation: 75

Webbrowsers are by default asynchronous so you don't need to thread them as they will each run in order.

If it's speed your after then maybe switch up to webclient or httpwebrequest. You don't need to download the images to run and can multi-thread those.

Upvotes: 0

volody
volody

Reputation: 7189

Following msdn article: "There are four methods on a control that are thread safe to call: Invoke, BeginInvoke, EndInvoke and CreateGraphics and InvokeRequired property"

You cannot make a direct call to WebBrowser1.Navigate from another thread

Follow How to: Make Thread-Safe Calls to Windows Forms Controls

Upvotes: 1

Related Questions