Wait .5 seconds before continuing code VB.net

Question

I have a code and I want it to wait somewhere in the middle before going forward. After the WebBrowser1.Document.Window.DomWindow.execscript(\"checkPasswordConfirm();\",\"JavaSc

Answer 1

Static tStart As Single, tEnd As Single, myInterval As Integer
myInterval = 5 ' seconds
tStart = VB.Timer()
tEnd = myInterval + VB.Timer()
Do While tEnd > tStart
    Application.DoEvents()
    tStart = VB.Timer()
Loop

Answer 2

The suggested Code is flawed:

Imports VB = Microsoft.VisualBasic

Public Sub wait(ByVal seconds As Single)
    Static start As Single
    start = VB.Timer()
    Do While VB.Timer() < start + seconds
        System.Windows.Forms.Application.DoEvents()
    Loop
End Sub

VB.Timer() returns the seconds since midnight. If this is called just before midnight the break will be nearly a full day. I would suggest the following:

Private Sub Wait(ByVal Seconds As Double, Optional ByRef BreakCondition As Boolean = False)
    Dim l_WaitUntil As Date
    l_WaitUntil = Now.AddSeconds(Seconds)
    Do Until Now > l_WaitUntil
        If BreakCondition Then Exit Do
        DoEvents()
    Loop
End Sub

BreakCondition can be set to true when the waitloop should be cancelled as DoEvents is called this can be done from outside the loop.

Answer 3

In web application a timer will be the best approach.

Just fyi, in desktop application I use this instead, inside an async method.

... 
Await Task.Run(Sub()
    System.Threading.Thread.Sleep(5000)
End Sub)
...

It work for me, importantly it doesn't freeze entire screen. But again this is on desktop, i try in web application it does freeze.

Answer 4

Make a timer, that activates whatever code you want to when it ticks. Make sure the first line in the timer's code is:

timer.enabled = false

Replace timer with whatever you named your timer.

Then use this in your code:

   WebBrowser1.Document.Window.DomWindow.execscript("checkPasswordConfirm();","JavaScript")
timer.enabled = true
Dim allelements As HtmlElementCollection = WebBrowser1.Document.All
For Each webpageelement As HtmlElement In allelements
    If webpageelement.InnerText = "Sign Up" Then
        webpageelement.InvokeMember("click")
    End If
Next

Answer 5

Another way is to use System.Threading.ManualResetEvent

dim SecondsToWait as integer = 5
Dim Waiter As New ManualResetEvent(False)
Waiter.WaitOne(SecondsToWait * 1000) 'to get it into milliseconds

Answer 6

Imports VB = Microsoft.VisualBasic

Public Sub wait(ByVal seconds As Single)
    Static start As Single
    start = VB.Timer()
    Do While VB.Timer() < start + seconds
        System.Windows.Forms.Application.DoEvents()
    Loop
End Sub

%20+ high cpu usage + no lag

Private Sub wait(ByVal seconds As Integer)
    For i As Integer = 0 To seconds * 100
        System.Threading.Thread.Sleep(10)
        Application.DoEvents()
    Next
End Sub

%0.1 cpu usage + high lag