C# JS方面的专业知识。尝试等待元素不可见。WebDriverWait wait=新的WebDriverWait（webDriver，timeoutingseconds）；wait.until（ExpectedConditions.visibilityOfEl

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JS方面的专业知识。尝试等待元素不可见。WebDriverWait wait=新的WebDriverWait（webDriver，timeoutingseconds）；wait.until（ExpectedConditions.visibilityOfElementLocated（By.XPath（//select[contains（@id，'.\uu TypeID'）][2]）；

IWebElement selectType =
            driver.FindElement(By.XPath("//select[@name='Entries[db9ef219-0f54-4925-9589-0f39351f44a4].TypeID']"));
        selectType.Click();

IWebElement selectType = driver.FindElement(By.XPath("//select[contains(@id, '__TypeID')]"));

<div class="RegEffEntryContainer" xpath="1">
<div class="row">
    <div class="col-11">
      <input type="hidden" name="Entries.index" autocomplete="off" value="21b28f6b-8aaa-4924-815a-1d925585fa36">
      <input data-val="true" data-val-number="The field EntryID must be a number." data-val-required="The EntryID field is required." id="Entries_21b28f6b-8aaa-4924-815a-1d925585fa36__EntryID" name="Entries[21b28f6b-8aaa-4924-815a-1d925585fa36].EntryID" type="hidden" value="391">                
            <div class="row">
                <div class="col-12 col-sm-6 col-lg-3">
                    <div class="field-wrapper">
                       <select class="form-control valid" data-val="true" data-val-number="The field TypeID must be a number." id="Entries_21b28f6b-8aaa-4924-815a-1d925585fa36__TypeID" name="Entries[21b28f6b-8aaa-4924-815a-1d925585fa36].TypeID" required="" aria-describedby="Entries_21b28f6b-8aaa-4924-815a-1d925585fa36__TypeID-error" aria-invalid="false">
                          <option value="">Select type</option>
                          <option value="1">Regulatory Activity</option>
                          <option value="2">Major Project</option>
                          <option value="3">Other Activities</option>
                       </select><span class="asterisk">*</span>
                    </div>
                </div>

IWebElement firstSelect = driver.FindElement(By.XPath("//select[contains(@id, '__TypeID')][1]")); 
IWebElement secondSelect = driver.FindElement(By.XPath("//select[contains(@id, '__TypeID')][2]"));
IWebElement thirdSelect = driver.FindElement(By.XPath("//select[contains(@id, '__TypeID')][3]"));

int numberOfEntriesOnPage = System.Convert.ToInt32(((IJavaScriptExecutor)driver).ExecuteScript("return document.getElementsByName('Entries.index').length"));
string[] array = new string[numberOfEntriesOnPage];
         for (int a = 0; a < numberOfEntriesOnPage; a++)
            {
                String script = "return document.getElementsByName('Entries.index')[" + a + "].value";
                array[a] = ((IJavaScriptExecutor)driver).ExecuteScript(script).ToString();
                Console.WriteLine("Array value:" + array[a]);
                string rowTypeID = "Entries_" + array[a] + "__TypeID";

                select_select_by_index(By.Id("Entries_" + array[a] + "__TypeID"), 1);
                IWebElement selectOrg = find_element(By.Name("Entries[" + array[a] + "].OrganisationID_input"));
                selectOrg.Clear();
                selectOrg.SendKeys("3801 LTD");

                IWebElement selectInOffice = driver.FindElement(By.Id("Entries_" + array[a] + "__InOffice"));
                selectInOffice.Clear();
                selectInOffice.SendKeys("10");

                IWebElement selectOffsite = driver.FindElement(By.Id("Entries_" + array[a] + "__Offsite"));
                selectOffsite.Clear();
                selectOffsite.SendKeys("5");

                IWebElement comments = driver.FindElement(By.Id("Entries_" + array[a] + "__Comment"));
                comments.Clear();
                comments.SendKeys(array[a] + "Manish test");

                IWebElement save = find_element(By.XPath("//button[@value='SaveDraft']"));

                save.Click();

            }

public static void select_select_by_index(By by, int index)
    {
        var select = new SelectElement(find_element(by));
        select.SelectByIndex(index);
    }