网页照相机代码及分析

此代码出自CSDN
http://download.csdn.net/source/1383175
我对代码进行了一些简单的分析
如下：

        public Form1()
        {
            InitializeComponent();
            //先定义控件的DocumentCompleted事件，网页加载完毕
            //System.Windows.Forms.WebBrowser
            this.webBrowser1.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(webBrowser1_DocumentCompleted);
        }
        /// <summary>
        /// 委托事件，网页加载完就触发
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
        {
            GetImage();
        }
        void GetImage()
        {
            if (webBrowser1.Document == null) return;
            try
            {
                //得到网页的高度
                int scrollHeight = webBrowser1.Document.Body.ScrollRectangle.Height;
                //得到网页的宽度
                int scrollWidth = webBrowser1.Document.Body.ScrollRectangle.Width;
                //重新设置控件的大小
                webBrowser1.Size = new Size(scrollWidth, scrollHeight);
                //创造一个空图片
                Bitmap bm = new Bitmap(scrollWidth, scrollHeight);
                //把控件画到这个图片中去
                webBrowser1.DrawToBitmap(bm, new Rectangle(0, 0, bm.Width, bm.Height));
                //制造一个文件名
                string saveAsName;
                saveAsName = Regex.Replace(txtURL.Text, @"(\\|\/|\:|\*|\?|\""|\<|\>|\|)?", "");
                //按这个文件名保存图片
                bm.Save(saveAsName + ".png", System.Drawing.Imaging.ImageFormat.Png);
                //释放这个图片
                bm.Dispose();
            }
            catch (Exception e)
            {
                MessageBox.Show(e.Message, "保存失败", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            finally
            {
            }
            btnOK.Enabled = true;
        }
        private void buttonCapture_Click(object sender, EventArgs e)
        {
            //开始加载一个网页，加载完了就执行委托事件
            webBrowser1.Navigate(txtURL.Text);
            btnOK.Enabled = false;
        }

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