BandObjectLib.BandObject.SetSite C# (CSharp) Метод

        public virtual void SetSite(Object pUnkSite)
        {
            if (BandObjectSite != null)
                Marshal.ReleaseComObject(BandObjectSite);

            if (Explorer != null)
            {
                Marshal.ReleaseComObject(Explorer);
                Explorer = null;
            }

            BandObjectSite = (IInputObjectSite)pUnkSite;
            if (BandObjectSite != null)
            {
                //pUnkSite is a pointer to object that implements IOleWindowSite or something  similar
                //we need to get access to the top level object - explorer itself
                //to allows this explorer objects also implement IServiceProvider interface
                //(don't mix it with System.IServiceProvider!)
                //we get this interface and ask it to find WebBrowserApp
                _IServiceProvider sp = BandObjectSite as _IServiceProvider;
                Guid guid = ExplorerGUIDs.IID_IWebBrowserApp;
                Guid riid = ExplorerGUIDs.IID_IUnknown;

                try
                {
                    object w;
                    sp.QueryService(
                        ref guid,
                        ref riid,
                        out w);

                    //once we have interface to the COM object we can create RCW from it
                    Explorer = (WebBrowserClass)Marshal.CreateWrapperOfType(
                        w as IWebBrowser,
                        typeof(WebBrowserClass)
                        );

                    OnExplorerAttached(EventArgs.Empty);
                }
                catch (COMException)
                {
                    //we anticipate this exception in case our object instantiated
                    //as a Desk Band. There is no web browser service available.
                }
            }
        }