尝试通过xpath查找元素时出错 - System.InvalidOperationException：String无法强制转换为WebElement？

Question

I am getting error on select2 element " System.InvalidOperationException: java.lang.String cannot be cast to org.openqa.selenium.WebElement " when trying to select value from it. It's strange that sometimes test passes and I am not having problems on other select2 elements for which I use the same code. What can be the problem here?

    Driver.FindElement(By.XPath("//*[@id='s2id_State']/a/span[2]/b")).Click();
    Driver.FindElement(By.CssSelector("#select2-drop input.select2-input")).SendKeys("1000");
    wait.Until(ExpectedConditions.TextToBePresentInElementLocated(By.XPath("//table/tbody/tr/td[1]/div[text()='1000']"), "1000")); //Error line
    Driver.FindElement(By.XPath("//table/tbody/tr/td[1]/div[text()='1000']")).Click();

Result StackTrace:  


  at OpenQA.Selenium.Remote.RemoteWebDriver.UnpackAndThrowOnError(Response errorResponse)
   at OpenQA.Selenium.Remote.RemoteWebDriver.Execute(String driverCommandToExecute, Dictionary`2 parameters)
   at OpenQA.Selenium.Remote.RemoteWebDriver.FindElement(String mechanism, String value)
   at OpenQA.Selenium.Remote.RemoteWebDriver.FindElementByXPath(String xpath)
   at OpenQA.Selenium.By.<>c__DisplayClasse.<XPath>b__c(ISearchContext context)
   at OpenQA.Selenium.By.FindElement(ISearchContext context)
   at OpenQA.Selenium.Remote.RemoteWebDriver.FindElement(By by)
   at OpenQA.Selenium.Support.UI.ExpectedConditions.<>c__DisplayClass26.<TextToBePresentInElementLocated>b__25(IWebDriver driver)
   at OpenQA.Selenium.Support.UI.DefaultWait`1.Until[TResult](Func`2 condition)
   at Automated.Test.Select2Test() in C:\....:line 86

Remote Webdriver :

     case "remote":
         var huburl = new Uri(ConfigurationManager.AppSettings["SeleniumHubAddress"]);
         DesiredCapabilities capabilities;
         switch (ConfigurationManager.AppSettings["WebDriverBrowserCapabilities"].ToLower())
                        {
                            case "firefox":
                                capabilities = DesiredCapabilities.Firefox();
                                break;
                            case "ie":
                                capabilities = DesiredCapabilities.InternetExplorer();
                                break;
                            case "chrome":
                                capabilities = DesiredCapabilities.Chrome();
                                break;
                            default:
                                throw new NotImplementedException(string.Format("WebDriverBrowserCapabilities of \"{0}\" is not implemented for {1} mode", ConfigurationManager.AppSettings["WebDriverBrowserCapabilities"].ToLower(), ConfigurationManager.AppSettings["WebDriverMode"].ToLower()));
                        }

         capabilities.IsJavaScriptEnabled = true;
         driver = new AdvancedRemoteWebDriver(huburl, capabilities);
         break;
     default:
         throw new NotImplementedException();

Answer 1

如果您使用的文本用户如下xpath：

//table/tbody/tr/td[1]/div[text()='1000']"

Answer 2

You can try to use explicit wait with ExpectedConditions

WebDriverWait wait = new WebDriverWait(driver, TimeSpan.FromSeconds(10));
wait.Until(ExpectedConditions.TextToBePresentInElementLocated(By.XPath("//table/tbody/tr/td[1]/div"), "1000")).Click();

This will wait up to 10 seconds for the element to have the text "1000" before clicking on it. You can also use

wait.Until(ExpectedConditions.ElementIsVisible(By.XPath("//table/tbody/tr/td[1]/div[.='1000']"))).Click();

Answer 3

Selenium for C# has several pre-constructed parameters for the WebDriverWait.Until() method. So you need not call FindElement() .

Maybe you can try something like

wait.Until(ExpectedConditions.ElementIsVisible(By.XPath("//table/tbody/tr/td[1]/div[.='1000']")));

If this doesn't work either, then maybe your XPath string is not correct (I just copied it from your question into my answer).