c# - Selenium:在for循环中使用错误的元素

Question

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using OpenQA.Selenium;
using OpenQA.Selenium.Support;
using OpenQA.Selenium.Chrome;
using System.Text.RegularExpressions;
using System.IO;
using OpenQA.Selenium.Support.UI;

namespace FlippaSearch
{
public partial class Form1 : Form
{
    static IWebDriver driverGC;
    public Form1()
    {
        driverGC = new ChromeDriver(@"Z:\Justin\Documents\Visual Studio 2015\chromedriver_win32");
        driverGC.Navigate().GoToUrl("https://flippa.com/websites/starter-sites?sitetype=blog&uniques_per_month_min=1000");
        InitializeComponent();
    }

    private void button1_Click(object sender, EventArgs e)
    {
        List<IWebElement> starterSites = new List<IWebElement>();
        List<String> myStarterSites = new List<string>();
        IWait<IWebDriver> wait = new WebDriverWait(driverGC, TimeSpan.FromSeconds(30.00));
        var numPages = (driverGC.FindElement(By.XPath("//*[@id='searchBody']/div[1]/div[1]/h2/span")).Text);
        double numberPages = int.Parse(Regex.Match(numPages, @"\d+", RegexOptions.RightToLeft).Value);
        numberPages = Math.Ceiling(numberPages / 50);
        int j;
        for (int i = 1; i <= numberPages; i++)
        {
            driverGC.Manage().Timeouts().PageLoad = TimeSpan.FromSeconds(30);
            var mySites = driverGC.FindElements(By.CssSelector(".ListingResults___listingResult"));
            int size = 1;
            for (j = 0; j < 3; ++j)
            {
                driverGC.Manage().Timeouts().PageLoad = TimeSpan.FromSeconds(30);
                mySites = driverGC.FindElements(By.CssSelector(".ListingResults___listingResult"));
                size = mySites.Count();
                driverGC.Manage().Timeouts().PageLoad = TimeSpan.FromSeconds(30);
                String siteLink = " ";
                siteLink = mySites[j].FindElement(By.CssSelector(".ListingResults___listingResultLink")).GetAttribute("href");

                driverGC.Navigate().GoToUrl(siteLink);
                driverGC.Manage().Timeouts().ImplicitWait = TimeSpan.FromSeconds(10);
                //testing tables
                int row_tr = 5;
                int Column_td = 3;
                String CellValue;
                String newCellValue;
                String cellValueChange;
                try
                {
                    driverGC.FindElement(By.XPath("/html/body/div[3]/div[1]/div[1]/div[5]/div[1]/div/table[1]/tbody"));
                    for (int k = 1; k <= row_tr; k++)
                    {
                        for (int b = 1; b <= Column_td; b++)
                        {
                            CellValue = driverGC.FindElement(By.XPath("/html/body/div[3]/div[1]/div[1]/div[5]/div[1]/div/table[1]/tbody/tr[" + k + "]/td[" + b + "]")).Text.ToString();
                            if (CellValue == "Organic Search")
                            {
                                String mySiteName = driverGC.FindElement(By.XPath("/html/body/div[3]/div[1]/div[1]/div[1]/div[1]/h1")).Text.ToString();
                                newCellValue = driverGC.FindElement(By.XPath("/html/body/div[3]/div[1]/div[1]/div[5]/div[1]/div/table[1]/tbody/tr[" + k + "]/td[3]")).Text.ToString();
                                cellValueChange = Regex.Replace(newCellValue, @"[%\s]", string.Empty);
                                float organicSearch = float.Parse(cellValueChange);
                                if (organicSearch >= 50)
                                {
                                    myStarterSites.Add(mySiteName);
                                    myStarterSites.Add(CellValue);
                                    myStarterSites.Add(newCellValue);
                                    Console.WriteLine(mySiteName);
                                    Console.WriteLine(CellValue);
                                    Console.WriteLine(newCellValue);
                                }

                            }
                        }
                    }
                }
                catch (OpenQA.Selenium.NoSuchElementException)
                {

                }
                //testing tables
                driverGC.Navigate().Back();
                //write shit to file
                siteLink = "";
                driverGC.Manage().Timeouts().PageLoad = TimeSpan.FromSeconds(30);
            }
            j = 0;
            //mySites = null;
            try
            {
                driverGC.FindElement(By.XPath("//*[@id='searchBody']/div[2]/div[2]/div/a[3]")).Click();
                //driverGC.Manage().Timeouts().PageLoad = TimeSpan.FromSeconds(30);
            }
            catch (ElementNotVisibleException)
            {
                Console.WriteLine("No more pages");
            }
        }
        using (StreamWriter writer = new StreamWriter(@"C:\Users\Justin\Desktop\newFile.txt"))
        {
            foreach (string s in myStarterSites)
            {
                writer.WriteLine(s + "  ");// Writes in next line
                writer.WriteLine(" ");
            }
        }
        //MessageBox.Show("End");
        driverGC.Quit();
        Application.Exit();    
    }
}
}

启动后，代码将在第一页上正常运行。它抓取元素，将它们放入列表中，然后我可以收集所需的信息。一旦循环遍历第一页(出于测试原因，我将其严格设置为 3，以便更快)，它将单击下一页，然后加载下一页并再次开始循环。问题是，当第二页加载时，第一页上的第一个元素再次被检查，然后在检查完后，它将转到第二页的第二个元素，然后从那里继续。我的问题是，我怎样才能让它扫描第二页上的第一个元素，而不是再次重做第一页上的第一个元素？我尝试过使用 Waits，但似乎无法正常工作。

提前致谢。

Answer 1

这可能是时间问题，下一个循环迭代在实际加载下一页之前开始。您可以在页码上使用显式等待和 ExpectedConditions TextToBePresentInElementLocated 以确保当前页面是您实际需要的页面。您可以使用 Pagination___activeLink 类检查元素中的数字

driverGC.FindElement(By.XPath("//*[@id='searchBody']/div[2]/div[2]/div/a[3]")).Click(); // go to next page

WebDriverWait wait = new WebDriverWait(driver, TimeSpan.FromSeconds(5));
wait.Until(ExpectedConditions.TextToBePresentInElementLocated(By.ClassName("Pagination___activeLink"), (i + 1).ToString()));