困惑於一些web瀏覽器功能

Question

public void PortalLogin() 
     { 
      string portalUrl = "URL"; 
      string portalEmail = "email"; 
      string portalPassword = "password"; 

      // Run when page finishes navigating 
      webBrowser2.DocumentCompleted += (s, e) => 
      { 
       HtmlElement head = webBrowser2.Document.GetElementsByTagName("head")[0]; 
       HtmlElement testScript = webBrowser2.Document.CreateElement("script"); 
       IHTMLScriptElement element = (IHTMLScriptElement)testScript.DomElement; 
       element.text = "function PortalLogin() { document.getElementById('username').value = '" + portalEmail + "'; document.getElementById('password').value = '" + portalPassword + "'; document.getElementById('credentials').submit(); }"; 
       head.AppendChild(testScript); 
       webBrowser2.Document.InvokeScript("PortalLogin"); 
      }; 

      // Navigate to the portal 
      webBrowser2.Navigate(portalUrl); 
      while (this.webBrowser2.ReadyState != WebBrowserReadyState.Complete) 
      { 
       Application.DoEvents(); 
       Thread.Sleep(100); 
      } 
     } 

我上面說的代碼段應該Navigate到特定的URL，然後在導航的完成，執行調用腳本登錄到網頁出現。現在，因爲整個PortalLogin()功能是while循環裏面，我必須包括：

while (this.webBrowser2.ReadyState != WebBrowserReadyState.Complete) 
       { 
        Application.DoEvents(); 
        Thread.Sleep(100); 
       } 

段，以使while循環不只是中斷導航功能一噸。但是，代碼並不是很有效，當我用斷點逐步完成時，流程似乎關閉。我認爲部分問題是我不太瞭解while循環測試ReadState != Complete的工作原理。有人能啓發我嗎？

Answer 1

更好地使用WebClient與Cookie或HttpWebRequest和HttpWebResponse。