君仙小一时的爬虫

if (textBox1.Text.Length<=0)
            {
                MessageBox.Show("请输入一个网址");
                textBox1.Focus();
                return;
            }
            else
            {
                //茉莉提交访问类
                HttpClient httpClient = new HttpClient();
                //网址
                var url = textBox1.Text.Trim();
                HttpResponseMessage response = httpClient.GetAsync(url).Result;
                if (response.IsSuccessStatusCode)
                {
                    HtmlAgilityPack.HtmlDocument doc = new HtmlAgilityPack.HtmlDocument();
                    HtmlNode node = doc.DocumentNode;
                    doc.LoadHtml(response.Content.ReadAsStringAsync().Result);
                    richTextBox1.Text = node.SelectNodes("//div[@class='info-cont']")[0].SelectNodes("//ul[@class='info-list']")[0].InnerText.Replace("\r\n","").Replace(" ","");
                   // richTextBox1.Text = node.SelectNodes("//div[@class='info-cont']")[0].SelectNodes("//ul[@class='info-list']")[0].InnerText.Replace("\r\n", "").Replace(" ", "");
                }
                else
                {
                    MessageBox.Show("未抓取到内容");
                    textBox1.Focus();
                    return;
                }
            }