无法从 XPath 获取数据

Question

我正在尝试使用 HtmlAgilityPack 从网页获取一些数据，它获取一些变量并给出一些结果。我想从此网页中检索 3 个数据字段，到目前为止我只能得到其中的 2 个。到目前为止我的代码

            struct Result
            {
                public string Description;
                public string thirdCountryDuty;
                public string tarifPreference;
            }

        private Result LoadWebPage(string url, string taric)
        {
         //This is the webpage which contains all three datas that I want. I just write it here as 
         url for testing
url = "https://ec.europa.eu/taxation_customs/dds2/taric/measures.jsp?Lang=en&SimDate=20200503&Area=SG&MeasType=&StartPub=&EndPub=&MeasText=&GoodsText=&op=&Taric=6213900010&search_text=goods&textSearch=&LangDescr=el&OrderNum=&Regulation=&measStartDat=&measEndDat=%22;"

            var result = new Result();
            taric = "6213900010";//This is a variable. I give it here for testing purposes
            txtEditCountry.Text = "SG";//This is a variable. I give it here for testing purposes
            try
            {

                var web2 = new HtmlWeb();
                var doc2 = web2.LoadFromBrowser(url, html =>
                {
                    // WAIT until the dynamic text is set
                    return !html.Contains("<div id=\"" + taric.ToString() + "\"></div>");
                });
               //t1 is the data that I cannot get
               var t1 = doc2.DocumentNode.SelectSingleNode("//span[contains(text(),'" + txtEditCountry.Text + "')] and .//span[contains(.,'duty_rate')]]").InnerText; 
                //This is working
                var t2 = doc2.DocumentNode.SelectSingleNode("//*[contains(@id,'"+ taric + "')]/table/tbody/tr/td[2]/table/tbody/tr/td[2]").InnerText;
                 //This is working
                 var t3 = doc2.DocumentNode.SelectSingleNode("//span[contains(@class,'duty_rate')]").InnerText;


                Console.WriteLine("Text 1: " + t1);
                Console.WriteLine("Text 2: " + t2);
                Console.WriteLine("Text 3: " + t3);
                result = new Result
                {
                    Description = t2,
                    thirdCountryDuty = t3,
                    tarifPreference = t1
                };

                return result;
            }
            catch (Exception ex)
            {

                result.Description= null;
                result.thirdCountryDuty = null;
                result.tarifPreference = null;
                MessageBox.Show("Check your data and try again \n" + ex.ToString());
                return result;
            }
        }

获取不到的数据是我在代码中写的t1。当我在 url "&Area=country code" 中输入特定国家时，此字段可见。如果我输入另一个国家，它会给我另一个数字或 0%。如果我什么都不放，它会给我一份所有国家的名单。如果我将其用作 Xpath

var t1 = doc2.DocumentNode.SelectSingleNode("//span[contains(text(),'" + txtEditXora.Text + "')]").InnerText;

它returns国家例如正确

Singapore (SG)

我想要这个国家的关税优惠百分比

这是我第一次使用 XPath，我还在学习，但我不想在我的项目中使用它。

Answer 1

这应该有效

//text()[contains(.,"preference")]/../../td[2]

Answer 2

你可以试试这个。我没有时间检查它是否适用于其他国家/地区。

doc2.DocumentNode.SelectNodes("//div[@id='" + taric + "']//td[@name='measure_description_search']//td")[4].InnerText

或者这样：

doc2.DocumentNode.SelectNodes("//div[@id='" + taric + "']//span[@class='duty_rate']")[1].InnerText

无法从 XPath 获取数据

Cannot get data from XPath

c#

xpath

html-agility-pack