使用 WebBrowser .NET 控制項放大網頁

在 IE7 中內置了“縮放”功能（顯示在狀態欄中），允許您放大 400%。我在展示/模擬應用程序中使用 WebBrowser .NET 控制項，並且需要放大網頁。這是可能嗎？

（我不想簡單地給頁面拍照並放大，因為我需要使用頁面上的連結和按鈕）。

如果重要的話，我正在使用 .NET 2.0。

IE Zoom似乎有一個解決方案，涉及覆蓋AttachInterfaces並DetachInterfaces在WebBrowser中獲取IWebBrowser2介面，然後ExecWB使用OLECMDID_OPTICAL_ZOOM.

我試過他的範常式式碼，它似乎工作；（刪節的）相關類如下所示：

using System;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace ZoomBrowser
{
   public partial class MyBrowser : WebBrowser
   {
       #region enums
       public enum OLECMDID
       {
           // ...
           OLECMDID_OPTICAL_ZOOM = 63,
           OLECMDID_OPTICAL_GETZOOMRANGE = 64,
           // ...
       }

       public enum OLECMDEXECOPT
       {
           // ...
           OLECMDEXECOPT_DONTPROMPTUSER,
           // ...
       }

       public enum OLECMDF
       {
           // ...
           OLECMDF_SUPPORTED = 1
       }
       #endregion

       #region IWebBrowser2
       [ComImport, /*SuppressUnmanagedCodeSecurity,*/
        TypeLibType(TypeLibTypeFlags.FOleAutomation | 
                    TypeLibTypeFlags.FDual |       
                    TypeLibTypeFlags.FHidden), 
        Guid("D30C1661-CDAF-11d0-8A3E-00C04FC9E26E")]
       public interface IWebBrowser2
       {
           [DispId(100)]  void GoBack();
           [DispId(0x65)] void GoForward();
           [DispId(0x66)] void GoHome();
           [DispId(0x67)] void GoSearch();
           [DispId(0x68)] void Navigate([In] string Url, 
                                        [In] ref object flags, 
                                        [In] ref object targetFrameName, 
                                        [In] ref object postData, 
                                        [In] ref object headers);
           [DispId(-550)] void Refresh();
           [DispId(0x69)] void Refresh2([In] ref object level);
           [DispId(0x6a)] void Stop();
           [DispId(200)]  object Application 
                          { [return: 
                             MarshalAs(UnmanagedType.IDispatch)] get; }
           [DispId(0xc9)] object Parent 
                          { [return: 
                             MarshalAs(UnmanagedType.IDispatch)] get; }
           [DispId(0xca)] object Container 
                          { [return: 
                             MarshalAs(UnmanagedType.IDispatch)] get; }
           [DispId(0xcb)] object Document 
                          { [return: 
                             MarshalAs(UnmanagedType.IDispatch)] get; }
           [DispId(0xcc)] bool TopLevelContainer { get; }
           [DispId(0xcd)] string Type { get; }
           [DispId(0xce)] int Left { get; set; }
           [DispId(0xcf)] int Top { get; set; }
           [DispId(0xd0)] int Width { get; set; }
           [DispId(0xd1)] int Height { get; set; }
           [DispId(210)]  string LocationName { get; }
           [DispId(0xd3)] string LocationURL { get; }
           [DispId(0xd4)] bool Busy { get; }
           [DispId(300)]  void Quit();
           [DispId(0x12d)] void ClientToWindow(out int pcx, out int pcy);
           [DispId(0x12e)] void PutProperty([In] string property, 
                                            [In] object vtValue);
           [DispId(0x12f)] object GetProperty([In] string property);
           [DispId(0)] string Name { get; }
           [DispId(-515)] int HWND { get; }
           [DispId(400)] string FullName { get; }
           [DispId(0x191)] string Path { get; }
           [DispId(0x192)] bool Visible { get; set; }
           [DispId(0x193)] bool StatusBar { get; set; }
           [DispId(0x194)] string StatusText { get; set; }
           [DispId(0x195)] int ToolBar { get; set; }
           [DispId(0x196)] bool MenuBar { get; set; }
           [DispId(0x197)] bool FullScreen { get; set; }
           [DispId(500)] void Navigate2([In] ref object URL, 
                                        [In] ref object flags, 
                                        [In] ref object targetFrameName, 
                                        [In] ref object postData, 
                                        [In] ref object headers);
           [DispId(0x1f5)] OLECMDF QueryStatusWB([In] OLECMDID cmdID);
           [DispId(0x1f6)] void ExecWB([In] OLECMDID cmdID, 
                                       [In] OLECMDEXECOPT cmdexecopt, 
                                       ref object pvaIn, IntPtr pvaOut);
           [DispId(0x1f7)] void ShowBrowserBar([In] ref object pvaClsid, 
                                               [In] ref object pvarShow, 
                                               [In] ref object pvarSize);
           [DispId(-525)] WebBrowserReadyState ReadyState { get; }
           [DispId(550)] bool Offline { get; set; }
           [DispId(0x227)] bool Silent { get; set; }
           [DispId(0x228)] bool RegisterAsBrowser { get; set; }
           [DispId(0x229)] bool RegisterAsDropTarget { get; set; }
           [DispId(0x22a)] bool TheaterMode { get; set; }
           [DispId(0x22b)] bool AddressBar { get; set; }
           [DispId(0x22c)] bool Resizable { get; set; }
       }
       #endregion

       private IWebBrowser2 axIWebBrowser2;

       public MyBrowser()
       {           
       }

       protected override void AttachInterfaces(
           object nativeActiveXObject)
       {
           base.AttachInterfaces(nativeActiveXObject);
           this.axIWebBrowser2 = (IWebBrowser2)nativeActiveXObject;
       }

       protected override void DetachInterfaces()
       {
           base.DetachInterfaces();
           this.axIWebBrowser2 = null;
       }

       public void Zoom(int factor)
       {
           object pvaIn = factor;
           try
           {
               this.axIWebBrowser2.ExecWB(OLECMDID.OLECMDID_OPTICAL_ZOOM,
                  OLECMDEXECOPT.OLECMDEXECOPT_DONTPROMPTUSER, 
                  ref pvaIn, IntPtr.Zero);
           }
           catch (Exception)
           {
               throw;
           }
       }
   }
}

引用自：https://stackoverflow.com/questions/738232