c# 利用cef3抓取京东关键词商品列表，以手机为例

利用c# 的cef3 模拟浏览器操作，抓取京东商城关键词商品列表

获取商品标题，商品id，商品链接，商品价格

 public partial class Form1 : Form
    {
        public ChromiumWebBrowser browser { get; set; }
        public string key = "手机";  //抓取的关键词
        string jdTab="综合";　　　　　//选择排序
        int goTab = 0;　　　　　　　　//判断是否已排序
        public Form1()
        {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            browser = new ChromiumWebBrowser("https://www.jd.com/"); //初始化浏览器地址
            this.Controls.Add(browser);
            browser.FrameLoadEnd += Web_FrameLoadEnd;  //设置监听，当浏览器加载完毕
        }
        private async void Web_FrameLoadEnd(object sender, FrameLoadEndEventArgs e)
        {
            Debug.WriteLine("进入页面：" + e.Url);
            //MessageBox.Show(e.Url.ToString());
            if (e.Url.Contains("https://www.jd.com/"))  //进入主页时

            {  
                // 设置关键词，点击搜索
                await browser.GetMainFrame().EvaluateScriptAsync(" $('#key').focus()"); 
                await browser.GetMainFrame().EvaluateScriptAsync(" $('#key').val('" + key + "')");
                await browser.GetMainFrame().EvaluateScriptAsync(" $('.button').click()");
            }
            else if (e.Url.Contains("https://passport.jd.com/uc/login"))
            {  //京东反爬页面，跳回主页，重新搜索
                browser.Load("https://www.jd.com/");
            }
            else if (e.Url.Contains("Search?"))
            {
                string url = "";
                string title = "";
                string price = "";
                string code = "";
                string searchResult = ""; //判断该关键词是否有效
                await browser.GetMainFrame().EvaluateScriptAsync("(function(){ return $('.ns-content').text();})()").ContinueWith(x =>
                {
                    try
                    {
                        searchResult += x.Result.Result.ToString();

                    }
                    catch (NullReferenceException s)
                    {
                    }

                });
                await browser.GetMainFrame().EvaluateScriptAsync("(function(){ return $('.check-error').text();})()").ContinueWith(x =>
                {
                    try
                    {
                        searchResult += x.Result.Result.ToString();

                    }
                    catch (NullReferenceException s)
                    {
                    }

                });
                Debug.WriteLine("searchResult:" + searchResult);
                if (!searchResult.Contains("没有") && !searchResult.Contains("仍然搜索") && !searchResult.Contains("点击查看")) //当页面字段不包含这些字样时，关键词搜索有效
                {
　　　　　　　　　　　　//选择排序，并将标识置为1
                    switch (jdTab)
                    {
                        case "综合": await browser.GetMainFrame().EvaluateScriptAsync("$('.f-sort a')[0].click()"); goTab = 1; break;
                        case "销量": await browser.GetMainFrame().EvaluateScriptAsync("$('.f-sort a')[1].click()"); goTab = 1; break;
                        case "价格": await browser.GetMainFrame().EvaluateScriptAsync("$('.f-sort a')[4].click()"); goTab = 1; break;
                        case "评论数": await browser.GetMainFrame().EvaluateScriptAsync("$('.f-sort a')[2].click()"); goTab = 1; break;
                    }
                    Thread.Sleep(2000);
                    browser.ExecuteScriptAsync(" scrollTo(0, document.body.scrollHeight)");
                    Thread.Sleep(3000);
                        int p = 0;  //数据丢失标志
                        int max = 0;　　//商品总数
                        Thread.Sleep(500);
                        await browser.GetMainFrame().EvaluateScriptAsync("(function(){ return $('.gl-item').length})()").ContinueWith(x =>
                        {
                            try
                            {
                                max = int.Parse(x.Result.Result.ToString());
                            }
                            catch (NullReferenceException s)
                            {
                            }

                        });
                    for (int index = 0; index <= max; index++)
                    {
                        await browser.GetMainFrame().EvaluateScriptAsync("(function(){ return $('.gl-item .p-name a')[" + index.ToString() + "].href})()").ContinueWith(x =>
                        {
                            try
                            {
                                url = x.Result.Result.ToString();
                                code = "JD" + Regex.Replace(url, @"[^d]*", "");
                            }
                            catch (Exception)
                            {
                                p = 1;
                            }
                        });

                        await browser.GetMainFrame().EvaluateScriptAsync("(function(){ return $('.gl-item .p-name em')[" + index.ToString() + "].innerText})()").ContinueWith(x =>
                        {
                            try
                            {
                                title = x.Result.Result.ToString().Replace("
","");
                            }
                            catch (Exception)
                            {

                                p = 1;
                            }
                        });
                        await browser.GetMainFrame().EvaluateScriptAsync("(function(){ return $('.gl-item .p-price strong')[" + index.ToString() + "].innerText.replace('￥','')})()").ContinueWith(x =>
                        {
                            try
                            {
                                price = x.Result.Result.ToString();
                            }
                            catch (Exception)
                            {
                                p = 1;
                            }
                        });
                        if (p == 0)
                        {
                            Debug.WriteLine("url:" + url + "   title=" + title + "  code=" + code + "   price=" + price);
                        }
                    }
                }
                else
                {
                    Debug.WriteLine("没有找到词:" + key);
                }
            }
        }
    }

抓取结果：