system.net.httpclient 4.0 vs2015

// 加入Cookie
foreach (string a in cookieStr.Split(';'))
{
cookieContainer.Add(new Cookie(a.Split('=')[0], a.Split('=')[1]));
}
HttpClientHandler httpClientHandler = new HttpClientHandler()
{
CookieContainer = cookieContainer,
AllowAutoRedirect = true,
UseCookies = true
};