为什么web浏览器COM对象火的页之前DocumentComplete事件被加载？我想这事件只发射时，页面被完全浏览器的窗口中呈现。

这是我的BHO实现：

  [标记有​​ComVisible特性（真），
GUID（5a954357-44bd-4660-9570-17bb1b71eeaa），
ClassInterface（ClassInterfaceType.None）
公共类BHO：接口IObjectWithSite
{
    私人web浏览器的浏览器;
    私营的DateTime startTime时;
    私人日期时间endTime的;
    私有对象_pUnkSite;

    公共无效OnDocumentComplete（对象pDisp，参考目标URL）
    {
        如果（！的ReferenceEquals（pDisp，_pUnkSite））
        {
            返回;
        }

        使用（StreamWriter的SW = File.AppendText（log_path））
        {
            endTime的= DateTime.Now;
            时间跨度TS = endTime.Subtract（startTime时）;
            sw.WriteLine（完成了{0} {1}，ts.Seconds，ts.Milliseconds）;
        }

    }

    公共无效OnBeforeNavigate2（对象pDisp，参考目标URL，引用对象旗帜，裁判的对象TargetFrameName，引用对象的PostData，引用对象接头，REF布尔取消）
    {
        如果（！的ReferenceEquals（pDisp，_pUnkSite））
        {
            返回;
        }
        的startTime = DateTime.Now;
    }

    公众诠释SetSite（对象的网站）
    {
        如果（网站！= NULL）
        {
            _pUnkSite =网站;
            浏览器=（web浏览器）的网站;
            browser.DocumentComplete + =新DWebBrowserEvents2_DocumentCompleteEventHandler（this.OnDocumentComplete）;
            browser.BeforeNavigate2 + =新DWebBrowserEvents2_BeforeNavigate2EventHandler（this.OnBeforeNavigate2）;
        }
        其他
        {
            browser.DocumentComplete  -  =新DWebBrowserEvents2_DocumentCompleteEventHandler（this.OnDocumentComplete）;
            browser.BeforeNavigate2  -  =新DWebBrowserEvents2_BeforeNavigate2EventHandler（this.OnBeforeNavigate2）;
            浏览器= NULL;

        }
        返回0;
    }

    公众诠释GetSite（REF的Guid GUID，出来的IntPtr ppvSite）
    {
        IntPtr的朋克= Marshal.GetIUnknownForObject（浏览器）;
        INT HR = Marshal.QueryInterface（朋克，裁判GUID，出ppvSite）;
        Marshal.Release（朋克）;

        返回小时;
    }
}
 

解决方案

由于有一个页面上的其他文件。一个IFRAME，或图像，例如，将触发的DocumentComplete 事件。你需要做的是确保所提出的目标的DocumentComplete 是实际的页面。例如：

 私人无效_webBrowser2Events_DocumentComplete（对象pdisp，参考目标URL）
{
    如果（！的ReferenceEquals（pdisp，_pUnkSite））
    {
        //退出，因为一个DocumentComplete不是文档完整的页面。
        返回;
    }
    //这里做你的正常的东西
}
 

其中， _pUnkSite 是从的 SetSite 。

Why does DocumentComplete event of WebBrowser COM object fire before page is loaded? I thought that this event is only fired when page is fully rendered in browser's window.

this is my BHO implementation:

[ComVisible(true),
Guid("5a954357-44bd-4660-9570-17bb1b71eeaa"),
ClassInterface(ClassInterfaceType.None)]
public class BHO : IObjectWithSite
{
    private WebBrowser browser;
    private DateTime startTime;
    private DateTime endTime;
    private object _pUnkSite;

    public void OnDocumentComplete(object pDisp, ref object URL)
    {
        if (!ReferenceEquals(pDisp, _pUnkSite))
        {
            return;
        }

        using (StreamWriter sw = File.AppendText("log_path"))
        {
            endTime = DateTime.Now;
            TimeSpan ts = endTime.Subtract(startTime);
            sw.WriteLine("completed in {0}.{1}", ts.Seconds, ts.Milliseconds);
        }

    }

    public void OnBeforeNavigate2(object pDisp, ref object URL, ref object Flags, ref object TargetFrameName, ref object PostData, ref object Headers, ref bool Cancel)
    {
        if (!ReferenceEquals(pDisp, _pUnkSite))
        {
            return;
        }
        startTime = DateTime.Now;
    }

    public int SetSite(object site)
    {
        if (site != null)
        {
            _pUnkSite = site;
            browser = (WebBrowser)site;   
            browser.DocumentComplete += new DWebBrowserEvents2_DocumentCompleteEventHandler(this.OnDocumentComplete);
            browser.BeforeNavigate2 += new DWebBrowserEvents2_BeforeNavigate2EventHandler(this.OnBeforeNavigate2);
        }
        else
        {
            browser.DocumentComplete -= new DWebBrowserEvents2_DocumentCompleteEventHandler(this.OnDocumentComplete);
            browser.BeforeNavigate2 -= new DWebBrowserEvents2_BeforeNavigate2EventHandler(this.OnBeforeNavigate2);
            browser = null;

        }
        return 0;
    }

    public int GetSite(ref Guid guid, out IntPtr ppvSite)
    {
        IntPtr punk = Marshal.GetIUnknownForObject(browser);
        int hr = Marshal.QueryInterface(punk, ref guid, out ppvSite);
        Marshal.Release(punk);

        return hr;
    }
}

Because there are other documents on a page. An iframe, or an image, for example, will fire the DocumentComplete event. What you need to do is ensure that the object that raised DocumentComplete is the actual page. For example:

private void _webBrowser2Events_DocumentComplete(object pdisp, ref object url)
{
    if (!ReferenceEquals(pdisp, _pUnkSite))
    {
        //Exit, because the DocumentComplete is not the document complete for the page.
        return;
    }
    //Do your normal stuff here
}

Where _pUnkSite is the site that was passed in from SetSite.