C# IE浏览器 判断是否已经打开了指定Url

    SHDocVw.ShellWindows shellWindows = new SHDocVw.ShellWindows();

    bool hasCurrentUrl = false;
    foreach (SHDocVw.InternetExplorer browser in shellWindows)
    {
        if (string.IsNullOrEmpty(browser.FullName))
        {
            continue;
        }
        string filename = Path.GetFileNameWithoutExtension(browser.FullName).ToLower();
        if (filename.Equals("iexplore") && browser.LocationURL.Contains(webUri))
        {
            hasCurrentUrl = true;
            break;
        }
    }

    SHDocVw.InternetExplorer webBrowser1 = (SHDocVw.InternetExplorer)shellWindows.Item(shellWindows.Count - 1);
    webBrowser1.Navigate(webUri);