Develop Reference

Why the Login web page isn't showing in webBrowser?

I am using C# to login to a local web page.
I am using webBrowser in order to display the page after the log.
First, I navigate to page then I fill the username & password then I invoke a click.The element to be clicked is recognized; so I assume that the click happened. But the result page isn't showing, nothing appears when I execute.
I tried this:
public WebBrowser webBrowser;
public MainWindow()
{
InitializeComponent();
webBrowser = new WebBrowser();
webBrowser.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(LoginEvent);
webBrowser.AllowNavigation = true;
webBrowser.Navigate("http://192.168.1.100/login.html");
}
private void LoginEvent(object sender, WebBrowserDocumentCompletedEventArgs e)
{
WebBrowser webBrowser = sender as WebBrowser;
//To execute the event just one time
webBrowser.DocumentCompleted -= LoginEvent;
//load page's document
HtmlDocument doc = webBrowser.Document;
doc.GetElementById("u").SetAttribute("value", "admin");
doc.GetElementById("pw").SetAttribute("value", "123456");
foreach (HtmlElement elem in doc.GetElementsByTagName("a"))
{
elem.InvokeMember("click");
}
}
Can anyone help me please to figure why the page isn't showing?

1) Your WebBrowser object is a local variable in your MainWindow() constructor.
This object is being deposed once the MainWindow constructor ends.
You need to declare the WebBrowser object as a class member.
2) There might be a multiple DocumentComplete events being fired. You need to filter out all iFrame events and wait before the page being fully loaded:
private void LoginEvent(object sender, WebBrowserDocumentCompletedEventArgs e)
{
// filter out non main documents
if (e.Url.AbsolutePath != (sender as WebBrowser).Url.AbsolutePath)
return;
//To execute the event just one time
webBrowser.DocumentCompleted -= LoginEvent;
//load page's document
HtmlDocument doc = webBrowser.Document;
doc.GetElementById("u").SetAttribute("value", "admin");
doc.GetElementById("pw").SetAttribute("value", "123456");
foreach (HtmlElement elem in doc.GetElementsByTagName("a"))
{
elem.InvokeMember("click");
}
}

Handle WebBrowser.ShowPrintDialog() close event without "SHDocVw"

To print document I have created separate WindowsApplication and each time I want to print any document I call that application with path as parameter and Print application have below code:
public static void Print(string path)
{
WebBrowser wb = new WebBrowser();
wb.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(webBrowser_DocumentCompleted);
wb.Navigate(path);
}
public static void webBrowser_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
WebBrowser wb = (WebBrowser)sender;
if (wb.ReadyState.Equals(WebBrowserReadyState.Complete))
{
((SHDocVw.WebBrowser)wb.ActiveXInstance).PrintTemplateTeardown += Print_PrintTemplateTeardown;
wb.ShowPrintDialog();
}
}
void Print_PrintTemplateTeardown(object pDisp)
{
_Application.Exit();
}
When I call Print aaplication, using "WebBrowser" control it loads document and show Print Dialog using "wb.ShowPrintDialog();".
On Print Dialog when I click Print or Cancel I got PrintTemplateTeardown event where I asks Application to Exit (To close application).
Now I want to remove "SHDocVw" dependency from my Print Application due to some security issue while installing on client's machine through Internet.
If I remove "SHDocVw", is there any alternate event or solution available that achknowledge me that PrintDialog is closed?

load page into the webBrowser and grab HTML

I need to load the page into the webBrowser, wait for this page to load (including the ajax) and then grab the HTML of that page.
I tried this, but it seems to be not working as intended. Any help would be great!
WebBrowser webBrowser = new WebBrowser();
webBrowser.Navigate("http://www.mysite.com");
String htmldoc = webBrowser.DocumentText;

Subscribe to DocumentCompleted...
private void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
string htmldoc = webBrowser.Document.Body.InnerHtml;
}
That should do the trick.

C#: How do I get the document title from a WebBrowser element?

I'm having issues trying to get the document title from a WebBrowser in C#. It works fine in VB.NET, but it won't give me any properties in C#.
When I type in MyBrowser.Document., the only options I get are 4 methods: Equals, GetHashCode, GetType, and ToString - no properties.
I think it's because I have to assign the document to a new instance first, but I can't find the HTMLDocument class that exists in VB.NET.
Basically what I'm wanting to do is return the Document.Title each time the WebBrowser loads/reloads a page.
Can someone help please? It will be much appreciated!
Here is the code I have at the moment...
private void Link_Click(object sender, RoutedEventArgs e)
{
WebBrowser tempBrowser = new WebBrowser();
tempBrowser.HorizontalAlignment = HorizontalAlignment.Left;
tempBrowser.Margin = new Thickness(-4, -4, -4, -4);
tempBrowser.Name = "MyBrowser";
tempBrowser.VerticalAlignment = VerticalAlignment.Top;
tempBrowser.LoadCompleted += new System.Windows.Navigation.LoadCompletedEventHandler(tempBrowser_LoadCompleted);
tempTab.Content = tempBrowser; // this is just a TabControl that contains the WebBrowser
Uri tempURI = new Uri("http://www.google.com");
tempBrowser.Navigate(tempURI);
}
private void tempBrowser_LoadCompleted(object sender, EventArgs e)
{
if (sender is WebBrowser)
{
MessageBox.Show("Test");
currentBrowser = (WebBrowser)sender;
System.Windows.Forms.HtmlDocument tempDoc = (System.Windows.Forms.HtmlDocument)currentBrowser.Document;
MessageBox.Show(tempDoc.Title);
}
}
This code doesn't give me any errors, but I never see the second MessageBox. I do see the first one though (the "Test" message), so the program is getting to that code block.

Add reference to Microsoft.mshtml
Add event receiver for LoadCompleted
webbrowser.LoadCompleted += new LoadCompletedEventHandler(webbrowser_LoadCompleted);
Then you will have no problems with document not being loaded in order to read values back out
void webbrowser_LoadCompleted(object sender, NavigationEventArgs e)
{
// Get the document title and display it
if (webbrowser.Document != null)
{
mshtml.IHTMLDocument2 doc = webbrowser.Document as mshtml.IHTMLDocument2;
Informative.Text = doc.title;
}
}

You are not using the Windows Forms WebBrowser control. I think you got the COM wrapper for ieframe.dll, its name is AxWebBrowser. Verify that by opening the References node in the Solution Explorer window. If you see AxSHDocVw then you got the wrong control. It is pretty unfriendly, it just gives you an opaque interface pointer for the Document property. You'll indeed only get the default object class members.
Look in the toolbox. Pick WebBrowser instead of "Microsoft Web Browser".

string title = ((HTMLDocument)MyBrowser.Document).Title
Or
HTMLDocument Doc = (HTMLDocument)MyBrowser.Document.Title ;
string title = doc.Title;

LoadCompleted doesn't fire. You should use Navigated event handler instead of it.
webBrowser.Navigated += new NavigatedEventHandler(WebBrowser_Navigated);
(...)
private void WebBrowser_Navigated(object sender, NavigationEventArgs e)
{
HTMLDocument doc = ((WebBrowser)sender).Document as HTMLDocument;
foreach (IHTMLElement elem in doc.all)
{
(...)
}
// you may have to dispose WebBrowser object on exit
}

Finally works well with:
using System.Windows.Forms;
...
WebBrowser CtrlWebBrowser = new WebBrowser();
...
CtrlWebBrowser.Document.Title = "Hello World";
MessageBox.Show( CtrlWebBrowser.Document.Title );

.NET C#: WebBrowser control Navigate() does not load targeted URL

I'm trying to programmatically load a web page via the WebBrowser control with the intent of testing the page & it's JavaScript functions. Basically, I want to compare the HTML & JavaScript run through this control against a known output to ascertain whether there is a problem.
However, I'm having trouble simply creating and navigating the WebBrowser control. The code below is intended to load the HtmlDocument into the WebBrowser.Document property:
WebBrowser wb = new WebBrowser();
wb.AllowNavigation = true;
wb.Navigate("http://www.google.com/");
When examining the web browser's state via Intellisense after Navigate() runs, the WebBrowser.ReadyState is 'Uninitialized', WebBrowser.Document = null, and it overall appears completely unaffected by my call.
On a contextual note, I'm running this control outside of a Windows form object: I do not need to load a window or actually look at the page. Requirements dictate the need to simply execute the page's JavaScript and examine the resultant HTML.
Any suggestions are greatly appreciated, thanks!

You should handle the WebBrowser.DocumentComplete event, once that event is raised you will have the Document etc.
wb.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(wb_DocumentCompleted);
private void wb_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
WebBrowser wb = sender as WebBrowser;
// wb.Document is not null at this point
}
Here is a complete example, that I quickly did in a Windows Forms application and tested.
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
WebBrowser wb = new WebBrowser();
wb.AllowNavigation = true;
wb.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(wb_DocumentCompleted);
wb.Navigate("http://www.google.com");
}
private void wb_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
WebBrowser wb = sender as WebBrowser;
// wb.Document is not null at this point
}
}
Edit: Here is a simple version of code that runs a window from a console application. You can of course go further and expose the events to the console code etc.
using System;
using System.Windows;
using System.Windows.Forms;
namespace ConsoleApplication1
{
class Program
{
[STAThread]
static void Main(string[] args)
{
Application.Run(new BrowserWindow());
Console.ReadKey();
}
}
class BrowserWindow : Form
{
public BrowserWindow()
{
ShowInTaskbar = false;
WindowState = FormWindowState.Minimized;
Load += new EventHandler(Window_Load);
}
void Window_Load(object sender, EventArgs e)
{
WebBrowser wb = new WebBrowser();
wb.AllowNavigation = true;
wb.DocumentCompleted += wb_DocumentCompleted;
wb.Navigate("http://www.bing.com");
}
void wb_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
Console.WriteLine("We have Bing");
}
}
}

You probably need to host the control in a parent window. You can do this without breaking requirements by simply not showing the window that hosts the browser control by moving it off screen. It might also be useful for development to "see" that it does actually load something for testing, verification etc.
So try:
// in a form's Load handler:
WebBrowser wb = new WebBrowser();
this.Controls.Add(wb);
wb.AllowNavigation = true;
wb.Navigate("http://www.google.com/");
Also check to see what other properties are set on the WebBrowser object when you instantiate it via the IDE. E.g. create a Form, drop a browser control onto it and then check the form's designer file to see what code is generated. You might be missing some key property that needs to be set. I've discovered many-an-omission in my code in this way and also learned how to properly instantiate visual objects programmatically.
P.S. If you do use a host window, it should only be visible during development. You would hide in some manner for production.
Another approach:
You could go "raw" by tryiing something like this:
System.Net.WebClient wc = new System.Net.WebClient();
System.IO.StreamReader webReader = new System.IO.StreamReader(
wc.OpenRead("http://your_website.com"));
string webPageData = webReader.ReadToEnd();
...then RegEx or parse webPageData for what you need. Or do you need the jscript in the page to actually execute? (Which should be possible with .NET 4.0)

I had this problem, and I did not realize that I had uninstalled Internet Explorer. If you have, nothing will ever happen, since the WebBrowser control only instantiates IE.

The Webbrowser control is just a wrapper around Internet Explorer.
You can set in onto an invisible Windows Forms window to completely instantiate it.