WebBrowser无法正常工作

Question

I have this code:

This is a button press:

int part = 0;
web.Navigate(loginURL.Text + "/auth/login");
wait.Enabled = true;

This is a timer "wait", with interval set to 6000:

if (part == 0)
            {
                part = 2;
                web.Document.GetElementById("idLoginUserName").SetAttribute("value", user);
                web.Document.GetElementById("idLoginPassword").SetAttribute("value", pass);
                web.Document.GetElementById("idLoginBtn").InvokeMember("click");
            }
            if (part == 2)
            {
                web.Navigate(fullURL.Text);
                part = 3;
            }
            if (part == 3)
            {
                web.Document.GetElementById("title").SetAttribute("value", title.Text);
            }
            if (part == 4)
            {
                web.Navigate("www.vbulletin.com/forum/auth/logout");
                part = 5;
            }
            if (part == 5)
            {
                part = 0;
                web.Navigate(loginURL.Text + "/auth/login");
            }

The button press works fine, however:

 web.Document.GetElementById("idLoginUserName").SetAttribute("value", user);
                    web.Document.GetElementById("idLoginPassword").SetAttribute("value", pass);
                    web.Document.GetElementById("idLoginBtn").InvokeMember("click");

does nothing. The text isn't changed, the button isn't clicked, etc. I've checked and double checked the IDs and it's right.

The loginURL.Text is this

Answer 1

My guess you try to access the document before navigation is completed, this works for me...

web.DocumentCompleted += (s, e) =>
{
    web.Document.GetElementById("idLoginUserName").SetAttribute("value", user);
    web.Document.GetElementById("idLoginPassword").SetAttribute("value", pass);
    web.Document.GetElementById("idLoginBtn").InvokeMember("click");
};
web.Navigate("http://www.vbulletin.com/forum/auth/login");

Answer 2

You are not obliged to do everything using C#. If you treat the embedded web page as a black box fro the point of view of your app, you can give it internal behaviours using scripts, and jQuery makes this sort of thing short, sweet and very legible for those who come after, with the added benefit of not polluting application logic with functionally trivial but frequently complex UI behaviour code.

$(function(){
  $("#idLoginUserName").val(user);
  $("#idLoginPassword").val(password);
  $("#idLoginBtn").click();
});