这个我知道了，但是切换页面句柄在怎么切换回来

var row = 1;
IWebDriver driver = new OpenQA.Selenium.Chrome.ChromeDriver("E:\drive\chromedriver");
//跳转地址
driver.Navigate().GoToUrl("https://zfcg.czt.zj.gov.cn/");
//睡0.3秒
Thread.Sleep(300);
//获取当前页面句柄
var ss = driver.CurrentWindowHandle;
var a = 1;
var b = 1;
var urlone = driver.FindElement(By.XPath("/html/body/div[3]/div[6]/div[3]/ul/li[" + a + "]/a"));
var urlones = "/html/body/div[3]/div[6]/div[3]/ul/li[position()]a";
//var urls = driver.FindElement(By.XPath(" /html/body/div[3]/div[6]/div[3]/ul/li[position()]"));
for (int i = 0; i < urlones.Count(); i++)
{
//睡0.3秒
Thread.Sleep(300);
urlone.Click();
//获取当前页面句柄
var s = driver.CurrentWindowHandle;
//获取所有页句柄
var hanles = driver.WindowHandles;
foreach (var item in hanles)
{
//切换窗口
driver.SwitchTo().Window(item);
}
var urltwo = driver.FindElement(By.XPath("/html/body/div[2]/div[3]/div[3]/ul/li[" + b + "]/a"));
var urltwos = "/html/body/div[2]/div[3]/div[3]/ul/li[position()]/a";
for (int j = 0; j < urltwos.Count(); j++)
{
//睡0.3秒
Thread.Sleep(3000);
urltwo.Click();//一直点击的都是第一个
b++;
}
//获取所有页句柄
var hanless = driver.WindowHandles;
foreach (var item in hanless)
{
//切换窗口
driver.SwitchTo().Window(item);
}
//睡0.3秒
Thread.Sleep(3000);
a++;

            }
            return (row > 0);

@宋人鱼:
在跳转页面前加上这段代码
String handleaddSpu = driver.getWindowHandle();
for (String temhandleaddSpu : driver.getWindowHandles()) {
if (!temhandleaddSpu.equals(handleaddSpu))
driver.close();
driver.switchTo().window(temhandleaddSpu);
}