using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using OpenQA.Selenium;
using OpenQA.Selenium.IE;
using OpenQA.Selenium.Support;
using OpenQA.Selenium.Support.UI;
using Selenium;
using mySelenium;
using System.Runtime.InteropServices;

namespace mySelenium
{
    class Program
    {
        [DllImport("user32.dll", CharSet = CharSet.Auto, ExactSpelling = true)]
        public static extern IntPtr GetForegroundWindow();
        static void Main(string[] args)
        {
            IWebDriver driver = new InternetExplorerDriver();
            INavigation navigation = driver.Navigate();
            navigation.GoToUrl("SharePoint网站url");
            driver.FindElement(By.Id("overridelink")).Click();
            IntPtr myPtr = GetForegroundWindow();
            //IntPtr hWnd = FindWindow(null, "abc");
            if (myPtr != IntPtr.Zero) 
            {
                //Send message to the window.
                System.Windows.Forms.SendKeys.SendWait("用户名");
                System.Windows.Forms.SendKeys.SendWait("{TAB}");
                System.Windows.Forms.SendKeys.SendWait("密码");
                System.Windows.Forms.SendKeys.SendWait("{ENTER}");
            }   
        }
    }
}