监控 WebBrowser 控件内容的改变

今天的收获只有一项，那就是这个啦。。。
呵呵， 主要的就是用到mshtml.IHTMLChangeSink 中的 Notify方法触发自定义的事件，具体的代码我也不懂，嘿嘿 这些都是从 东西市 Copy 来的，乱的成粥了。

几点核心代码：


public class Monitor : mshtml.IHTMLChangeSink
{
        // for monitor htmleditor textchanged
        private Guid IMarkupContainer2GUID = typeof(mshtml.IMarkupContainer2).GUID;
　　　
        private uint cookie = 0;

        private mshtml.IMarkupContainer2 markupContainer;

　　  private WebBrowser webBrowser;

　　　// Event
       public event Action HtmlEditorEvent;


　      public Monitor(WebBrowser webControl)

　　　{
　　　　　　this.webBrowser= webControl;
         }


        #region For HtmlEditor TextChanged
        
        // always monitor
        private mshtml.IMarkupContainer2 GetMarkupContainer()
        {
            object oDocument = this.webBrowser.Document.DomDocument;

            IntPtr pDocument = Marshal.GetIUnknownForObject(oDocument);

            IntPtr pMarkupContainer = IntPtr.Zero;

            // pMarkupContainer is different after a call to Navigate or designMode

            Marshal.QueryInterface(pDocument, ref IMarkupContainer2GUID, out pMarkupContainer);

            //object oMarkupContainer = Marshal.GetObjectForIUnknown(pMarkupContainer); // This does not work

            object oMarkupContainer = Marshal.GetUniqueObjectForIUnknown(pMarkupContainer);

            Marshal.Release(pDocument);

            Marshal.Release(pMarkupContainer);

            return (mshtml.IMarkupContainer2)oMarkupContainer;

        }


        // only one monitor
        private mshtml.IMarkupContainer2 GetMarkupContainer2()
        {
            return (mshtml.IMarkupContainer2)this.webBrowser.Document.DomDocument;
        }


        public void MonitorTextChangedAlways()
        {
            this.markupContainer = GetMarkupContainer();

            this.markupContainer.RegisterForDirtyRange((mshtml.IHTMLChangeSink)this, out this.cookie);
        }


        public void StopMonitorTextChanged()
        {
            if (this.markupContainer != null)
            {
                this.markupContainer.UnRegisterForDirtyRange(this.cookie);
            }
        }

        #endregion


        #region Implement Interface

        public void Notify()
        {
            //触发改变事件外界去接受
            if (this.HtmlEditorEvent != null)
            {
                this.HtmlEditorEvent();
            }
        }

        #endregion


}