元素不可见异常C＃

Question

我在运营商下拉列表中遇到了元素不可见的异常。我尝试了隐式等待，显式等待以及所有id，class，XPath，CSS选择器方式来查找元素。

请帮助我获得正确的XPath。我有“元素不可见”异常错误消息。

<select class="form-control error" id="smsCarrier" name="smsCarrier" required="" data-required-message="Carrier is required." aria-required="true" aria-invalid="false">
    <option value="-1">Select a Carrier</option>
    <option value="@message.alltel.com">Alltel</option>
    <option value="@txt.att.net">AT&amp;T</option>
    <option value="@myboostmobile.com">Boost Mobile</option>
    <option value="@sms.cricketwireless.net">Cricket Wireless</option>
    <option value="@msg.fi.google.com">Project Fi</option>
    <option value="@text.republicwireless.com">Republic Wireless</option>
    <option value="@messaging.sprintpcs.com">Sprint</option>
    <option value="@tmomail.net">T-Mobile</option>
    <option value="@email.uscc.net">US Cellular</option>
    <option value="@vtext.com">Verizon</option>
    <option value="@vmobl.com">Virgin Mobile</option>
</select>

我用过流利的等待。

public void ContinueWhenReady(By locator, int timeout)
{
    for (int i = 0; i < 2; i++)
    {

        try
        {
            WebDriverWait wait = new WebDriverWait(driver, TimeSpan.FromSeconds(timeout));
            IWebElement element = wait.Until(ExpectedConditions.ElementToBeClickable(locator));

            break;
        }
        catch (Exception e)
        {
        }

    }
}

//PhoneNumberDetails details = table.CreateInstance<PhoneNumberDetails>();

ContinueWhenReady(By.CssSelector("#smsCarrier"), 50);
var SelectaCarrierDropDown = driver.FindElement(By.CssSelector("#smsCarrier"));
SelectaCarrierDropDown.Click();
var selectaCarrierElement = new SelectElement(SelectaCarrierDropDown);
//selectaCarrierElement.SelectByText(details.SelectaCarrier);
selectaCarrierElement.SelectByValue("@myboostmobile.com");