WebBrowser控件使用技巧分享

WebBrowser控件使用技巧分享2011-04-17 博客园斯克迪亚首先分享一个WebBrowser的扩展类（此类所需的dll将在文章末尾提供下载），大家最好都使用这个类来替代.Net框架中的WebBrowser类，它提供了两个扩展功能：

1.屏蔽错误脚本提示。修正了WebBrowser控件本身屏蔽错误不全的问题，由启明提出，原文：http://www.cnblogs.com/hobe/archive/2007/01/14/619906.html

2.扩展NewWindow事件。修正了WebBrowser控件本身的NewWindow事件不提供新窗口Url的问题，通过新增的BeforeNewWindow事件予以支持，由佳文转载并整理，原文： http://www.cnblogs.com/yjwgood/archive/2009/02/09/1386789.html

整合后的代码如下：

public class ExWebBrowser : System.Windows.Forms.WebBrowser
{
    private SHDocVw.IWebBrowser2 Iwb2;
    protected override void AttachInterfaces（object nativeActiveXObject）
    {
        Iwb2 = （SHDocVw.IWebBrowser2）nativeActiveXObject;
        Iwb2.Silent = true;
        base.AttachInterfaces（nativeActiveXObject）;
    }
    protected override void DetachInterfaces（）
    {
        Iwb2 = null;
        base.DetachInterfaces（）;
    }
    System.Windows.Forms.AxHost.ConnectionPointCookie cookie;
    WebBrowserExtendedEvents events;
    //This method will be called to give you a chance to create your own event sink
    protected override void CreateSink（）
    {
        //MAKE SURE TO CALL THE BASE or the normal events won"t fire
        base.CreateSink（）;
        events = new WebBrowserExtendedEvents（this）;
        cookie = new System.Windows.Forms.AxHost.ConnectionPointCookie （this.ActiveXInstance, events, typeof（DWebBrowserEvents2））;
    }
    protected override void DetachSink（）
    {
        if （null ！= cookie）
        {
            cookie.Disconnect（）;
            cookie = null;
        }
        base.DetachSink（）;
    }
    //This new event will fire when the page is navigating
    public event EventHandler BeforeNavigate;
    /// <summary>
    /// 可用于替代原来的NewWindow事件，新增了事件的Url参数支持。
    /// </summary>
    [CategoryAttribute（"操作"）, DescriptionAttribute（"经过扩展的NewWindow事 件，使用继承后的WebBrowserExtendedNavigatingEventArgs类型参数实现Url参数支持"）] 
    public event EventHandler BeforeNewWindow;
    protected void OnBeforeNewWindow（string url, out bool cancel）
    {
        EventHandler h = BeforeNewWindow;
        WebBrowserExtendedNavigatingEventArgs args = new WebBrowserExtendedNavigatingEventArgs（url, null）;
        if （null ！= h）
        {
            h（this, args）;
        }
        cancel = args.Cancel;
    }
    protected void OnBeforeNavigate（string url, string frame, out bool cancel）
    {
        EventHandler h = BeforeNavigate;
        WebBrowserExtendedNavigatingEventArgs args = new WebBrowserExtendedNavigatingEventArgs（url, frame）;
        if （null ！= h）
        {
            h（this, args）;
        }
        //Pass the cancellation chosen back out to the events
        cancel = args.Cancel;
    }
    //This class will capture events from the WebBrowser
    class WebBrowserExtendedEvents : System.Runtime.InteropServices.StandardOleMarshalObject, DWebBrowserEvents2
    {
        ExWebBrowser _Browser;
        public WebBrowserExtendedEvents（ExWebBrowser browser） { _Browser = browser; }
        //Implement whichever events you wish
        public void BeforeNavigate2（object pDisp, ref object URL, ref object flags, ref object targetFrameName, ref object postData, ref object headers, ref bool cancel）
        {
            _Browser.OnBeforeNavigate（（string）URL, （string） targetFrameName, out cancel）;
        }
        public void NewWindow3（object pDisp, ref bool cancel, ref object flags, ref object URLContext, ref object URL）
        {
            _Browser.OnBeforeNewWindow（（string）URL, out cancel）;
        }
    }
    [System.Runtime.InteropServices.ComImport（）, System.Runtime.InteropServices.Guid（"34A715A0-6587-11D0-924A-0020AFC7AC4D"）,
    System.Runtime.InteropServices.InterfaceTypeAttribute （System.Runtime.InteropServices.ComInterfaceType.InterfaceIsIDispatch）,
    System.Runtime.InteropServices.TypeLibType （System.Runtime.InteropServices.TypeLibTypeFlags.FHidden）]
    public interface DWebBrowserEvents2
    {
        [System.Runtime.InteropServices.DispId（250）]
        void BeforeNavigate2（
            [System.Runtime.InteropServices.In,
            System.Runtime.InteropServices.MarshalAs （System.Runtime.InteropServices.UnmanagedType.IDispatch）] object pDisp,
            [System.Runtime.InteropServices.In] ref object URL,
            [System.Runtime.InteropServices.In] ref object flags,
            [System.Runtime.InteropServices.In] ref object targetFrameName, [System.Runtime.InteropServices.In] ref object postData,
            [System.Runtime.InteropServices.In] ref object headers,
            [System.Runtime.InteropServices.In,
            System.Runtime.InteropServices.Out] ref bool cancel）;
        [System.Runtime.InteropServices.DispId（273）]
        void NewWindow3（
            [System.Runtime.InteropServices.In,
            System.Runtime.InteropServices.MarshalAs （System.Runtime.InteropServices.UnmanagedType.IDispatch）] object pDisp,
            [System.Runtime.InteropServices.In, System.Runtime.InteropServices.Out] ref bool cancel,
            [System.Runtime.InteropServices.In] ref object flags,
            [System.Runtime.InteropServices.In] ref object URLContext,
            [System.Runtime.InteropServices.In] ref object URL）;
    }
}
public class WebBrowserExtendedNavigatingEventArgs : CancelEventArgs
{
    private string _Url;
    public string Url
    {
        get { return _Url; }
    }
    private string _Frame;
    public string Frame
    {
        get { return _Frame; }
    }
    public WebBrowserExtendedNavigatingEventArgs（string url, string frame） 
        : base（）
    {
        _Url = url;
        _Frame = frame;
    }
}