DocumentComplete在页面完全加载之前触发

为什么WebBrowser COM对象的DocumentComplete事件在加载页面之前触发？我认为只有在浏览器窗口中完全呈现页面时才会触发此事件。DocumentComplete在页面完全加载之前触发

这是我的BHO实现：

[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; 
    } 
}

来源

2011-12-02 user1013552

因为有一个页面上的其他文件。例如，iframe或图像将触发DocumentComplete事件。你需要做的是确保引发DocumentComplete的对象是实际的页面。例如：

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 
}

哪里_pUnkSite的是，在从SetSite通过该网站。

来源

2011-12-02 16:30:39 vcsjones

我检查了你的方法。不幸的是，它不工作:(我比较页面加载时间与HttpWatch，并且有约40％的差异。DocumentComplete过早火灾 – user1013552

@ user1013552你可以编辑你的问题，并包括你的BHO的代码？ – vcsjones

或者也许HttpWatch显示不正确的数据.. 。 – user1013552

DocumentComplete在页面完全加载之前触发

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