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1.引用COM：MicroSoft Internet Controls

2. 核心代码如下：

 　　private void button2_Click(object sender, EventArgs e)
        {
            IWebBrowser2 axIWebBrowser2 =(IWebBrowser2) this.webBrowser1.ActiveXInstance;　//关键代码
            Zoom(axIWebBrowser2,150);
        }
        public void Zoom( IWebBrowser2 axIWebBrowser2,int factor)
        {
            object pvaIn = factor;
            try
            {
                axIWebBrowser2.ExecWB(OLECMDID.OLECMDID_OPTICAL_ZOOM,
                   OLECMDEXECOPT.OLECMDEXECOPT_DONTPROMPTUSER,
                   ref pvaIn, IntPtr.Zero);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }