c＃生成JS来填充webform：如何验证它的工作原理？

Question

继续：

  

WebBrowser Control in a new thread

     

how to fill an external web form with c# application?

我想填写网站（即gmail）网页表单。 我想避免WebBrowser控件开销。我用JS。 但是以下代码不起作用（因为Navigation_completed处理程序被调用太多次）。如何验证以下代码是否有效？有没有更快的方法呢？

static void Main(string[] args)
{
    runBrowserThread(new Uri("https://accounts.google.com/ServiceLogin?service=mail&passive=true&rm=false&continue=https%3A%2F%2Fmail.google.com%2Fmail%2F%3Fui%3Dhtml%26zy%3Dl&bsv=llya694le36z&ss=1&scc=1&ltmpl=default&ltmplcache=2&hl=iw&from=logout"));

}

private static void runBrowserThread(Uri url)
{
    var th = new Thread(() =>
    {
        var br = new WebBrowser();
        br.DocumentCompleted += browser_DocumentCompleted;
        br.Navigate(url);
          br.Navigate("javascript: void(document.getElementsByName('Email')[0].value = 'Name';document.getElementsByName('Passwd')[0].value = 'Pass'; document.getElementsByName('signIn')[0].click();)");                                
        Application.Run();
    });
    th.SetApartmentState(ApartmentState.STA);
    th.Start();
}

static void browser_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
    var br = sender as WebBrowser;
    if (br.Url == e.Url)
    {
        Console.WriteLine("Natigated to {0}", e.Url);
      //  Application.ExitThread();   // Stops the thread
    }
}

TIA