C how to wait for a webpage to finish loading before continuing

Question

I m trying to create a program to clone multiple bugs at a time through the web interface of our defect tracking system   How can I wait before a page is completely loaded before I continue     This is pseudo code  but this should give you an idea of what I m trying to do   The   actual code uses multi-threading and all that good stuff     foreach  string bug in bugs        webBrowser Navigate new Uri url        webBrowser Document GetElementById  product   SetAttribute  value   product       webBrowser Document GetElementById  version   SetAttribute  value   version       webBrowser Document GetElementById  commit   InvokeMember  click           Need code to wait for page to load before continuing

User · Answer

while  true             ie is the WebBrowser object             if  ie ReadyState    tagREADYSTATE READYSTATE COMPLETE                                break                            Thread Sleep 500               I used this way to wait untill the page loads

User · Answer

Best way to do this without blocking the UI thread is to use Async and Await introduced in  net 4 5    You can paste this in your code just change the Browser to your webbrowser name  This way  your thread awaits the page to load  if it doesnt on time  it stops waiting and your code continues to run   private async Task PageLoad int TimeOut                TaskCompletionSource lt bool gt  PageLoaded   null          PageLoaded   new TaskCompletionSource lt bool gt             int TimeElapsed   0          Browser DocumentCompleted     s  e    gt                        if  Browser ReadyState    WebBrowserReadyState Complete  return              if  PageLoaded Task IsCompleted  return  PageLoaded SetResult true                                 while  PageLoaded Task Status    TaskStatus RanToCompletion                        await Task Delay 10    interval of 10 ms worked good for me             TimeElapsed                if  TimeElapsed  gt   TimeOut   100  PageLoaded TrySetResult true                     And you can use it like this  with in an async method  or in a button click event  just make it async   private async void Button1 Click object sender  EventArgs e       Browser Navigate  www example com       await PageLoad 10    await for page to load  timeout 10 seconds       your code will run after the page loaded or timeout

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Check out the WatiN project      Inspired by Watir development of WatiN started in December 2005 to make a similar kind of Web Application Testing possible for the  Net languages  Since then WatiN has grown into an easy to use  feature rich and stable framework  WatiN is developed in C  and aims to bring you an easy way to automate your tests with Internet Explorer and FireFox using  Net

User · Answer

Task method worked for me  except Browser Task IsCompleted has to be changed to PageLoaded Task IsCompleted    Sorry I didnt add comment  that is because I need higher reputation to add comments

User · Answer

This code was very helpful for me  Maybe it could be for you also  wb Navigate url   while wb ReadyState    WebBrowserReadyState Complete         Application DoEvents      MessageBox Show  Loaded

User · Answer

yuna and bnl code failed in the case below   failing example   1st one waits for completed but  2nd one with the  invokemember  submit    didnt   invoke works  but ReadyState Complete  acts like its Completed before its REALLY completed   wb Navigate url   while wb ReadyState    WebBrowserReadyState Complete       Application DoEvents      MessageBox Show  ok this waits Complete       navigates to new page wb Document GetElementById  formId   InvokeMember  submit    while wb ReadyState    WebBrowserReadyState Complete       Application DoEvents      MessageBox Show  webBrowser havent navigated  yet  it gave me previous page s html       var html   wb Document GetElementsByTagName  HTML   0  OuterHtml      how to fix this unwanted situation   usage       public myForm1            myForm1 load                   func to make browser wait is inside the Extended class More tidy          WebBrowserEX wbEX   new WebBrowserEX             button1 click                wbEX Navigate  site1 com                wbEX waitWebBrowserToComplete wb                wbEX Document GetElementById  input1   SetAttribute  Value    hello                  submit does navigation             wbEX Document GetElementById  formid   InvokeMember  submit                wbEX waitWebBrowserToComplete wb                  this actually waits for document Compelete  worked for me               var processedHtml   wbEX Document GetElementsByTagName  HTML   0  OuterHtml              var rawHtml   wbEX DocumentText                       put this  extended class in your code     ie right below form class  or seperate cs file doesnt matter  public class WebBrowserEX   WebBrowser        ctor    WebBrowserEX               wired aumatically here  we dont need to worry our sweet brain       this DocumentCompleted     o  e    gt    webbrowserDocumentCompleted   true                instead of checking  readState  get state from DocumentCompleted Event          via bool value      bool webbrowserDocumentCompleted   false       public void waitWebBrowserToComplete                 while   webbrowserDocumentCompleted            Application DoEvents              webbrowserDocumentCompleted   false

User · Answer

If you are using the InternetExplorer Application COM object  check the ReadyState property for the value of 4

User · Answer

Assuming the  commit  element represents a standard Form submit button then you can attach an event handler to the WebBrowsers Navigated event

User · Answer

Have a go at Selenium  http   seleniumhq org  or WatiN  http   watin sourceforge net  to save yourself some work

User · Answer

I think the DocumentCompleted event of the WebBrowser control should get you where you need to go

User · Answer

Try the DocumentCompleted Event      webBrowser DocumentCompleted    new WebBrowserDocumentCompletedEventHandler webBrowser DocumentCompleted    void webBrowser DocumentCompleted object sender  WebBrowserDocumentCompletedEventArgs e        webBrowser Document GetElementById  product   SetAttribute  value   product       webBrowser Document GetElementById  version   SetAttribute  value   version       webBrowser Document GetElementById  commit   InvokeMember  click

[c#] C# how to wait for a webpage to finish loading before continuing

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