使用Xpcom.Shutdown()之后的GeckoFx,Xpcom.Initialize(路径)不能再使用了

时间:2013-12-28 10:41:07

标签: c# multithreading winforms geckofx

我想在我的C#应用​​程序中拥有多个gecko浏览器。

所以我做了什么:

FORM UI代码:

public partial class GeckoBrowserForm : Form
    {
        static GeckoBrowserForm()
        {   
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
        }

        public GeckoBrowserForm(string xulRunnerPath, string url)
        {
            InitializeXulRunner(xulRunnerPath);
            m_Url = url;
            FormBorderStyle = FormBorderStyle.FixedToolWindow;
            ShowInTaskbar = false;
            StartPosition = FormStartPosition.Manual;
            Location = new Point(0, 0);
            Size = new Size(800, 800);
            Done = false;
            InitializeComponent();
        }

    private static void InitializeXulRunner(string path)
            {
                if (!Xpcom.IsInitialized)
                {
                    Xpcom.Initialize(path);
                }
            }

protected override void OnLoad(EventArgs e)
{

    m_GeckoWebBrowser.Parent = this;
    m_GeckoWebBrowser.Dock = DockStyle.Fill;
    m_GeckoWebBrowser.DocumentCompleted += (s, ee) =>
    {
        var geckoDomElement = m_GeckoWebBrowser.Document.DocumentElement;
        if (geckoDomElement is GeckoHtmlElement)
        {
            GeckoHtmlElement element = (GeckoHtmlElement)geckoDomElement;
            DocumentDomHtml = element.InnerHtml;
        }

        if (m_Url.Equals(m_GeckoWebBrowser.Document.Url.ToString(), StringComparison.OrdinalIgnoreCase))
        {
            Done = true;
        }
    };

    m_GeckoWebBrowser.Navigate(m_Url);
}

并且在工作线程中,而不是UI:

if (Xpcom.IsInitialized)
{
    Xpcom.Shutdown();
}

using (GeckoBrowserForm geckoBrowserForm = new GeckoBrowserForm(XulRunnerPath, propertyBag.ResponseUri.ToString()))
{
    geckoBrowserForm.Show();

    while (!geckoBrowserForm.Done)
    {
        Application.DoEvents();
    }


    string html = geckoBrowserForm.DocumentDomHtml;
    if (!string.IsNullOrEmpty(html))
    {
        propertyBag.GetResponse = () => new MemoryStream(Encoding.UTF8.GetBytes(html));
    }

    base.Process(crawler, propertyBag);
}

问题是,在我使用Xpcom.Shutdown();之后,我再也无法使用Xpcom.Initialize(path);了。程序刚刚停止而没有任何错误。

为什么?

我知道geckoFx只能在同一个UI线程中使用,我想再次初始化它

public static void AssertCorrectThread()
        {
            if (Thread.CurrentThread.ManagedThreadId != _XpcomThreadId)
            {
                throw new InvalidOperationException("GeckoFx can only be called from the same thread on which it was initialized (normally the UI thread).");
            }
        }

1 个答案:

答案 0 :(得分:0)

看来这仍然是一个问题,在单元测试时非常重要。运行所有单元测试(以初始化开始),一切都很好。尝试再次运行它们,并且可能会遇到问题,具体取决于xpCom的状态,因为无法关闭。

此处类似的问题:Using GeckoFX in a multithreaded application