private void button1_Click(object sender, EventArgs e)

        {

            string urlPath = "https://www.cnblogs.com";//

            HtmlDocument html = GetHtmlDocument(urlPath);

            textBox1.Text = html.Body.InnerHtml;

        }

        //不使用控件中加载html文档

        private HtmlDocument GetHtmlDocument(string htmlpath)

        {

            WebBrowser getInfoWebBrowser = new WebBrowser();

            //是否弹出js出错对话框 true 标示不弹对话框

            getInfoWebBrowser.ScriptErrorsSuppressed = true;

            //把从网络下载的html流赋值给 WebBrowser

            /*

             * WebRequest.Create(htmlpath).GetResponse().GetResponseStream();

             * 从指定网址下载资源

             *

             */

            getInfoWebBrowser.DocumentStream = WebRequest.Create(htmlpath).GetResponse().GetResponseStream();

            HtmlDocument html = getInfoWebBrowser.Document;

            //让程序处理当前消息 [不可少]

            Application.DoEvents();

            //释放资源

            getInfoWebBrowser.Dispose();

            return html;

        }