DotNet常用的Cookies操纵

//（增）创建一个Cookies
HttpCookie cookies = new HttpCookie("user");
cookies.Values.Add("userName", "Mickey");
cookies.Values.Add("email", "Mickey@java163.cn");
cookies.Expires = DateTime.Now.AddMilliseconds(5000); //失效时间=当前时间+5毫秒
Response.Cookies.Add(cookies);

//（删）删除一个Cookies
HttpCookie cookie = Request.Cookies["user"];
cookie.Expires = DateTime.Now.AddMilliseconds(-1); //设置过期时间为-1毫秒，浏览器下次访问时会自动删除此Cookies
Response.Cookies.Add(cookie);

//（改）修改Cookies的值（其实不可以直接修改，只能通过覆盖的方式来修改）
HttpCookie cookies = Request.Cookies["user"];
if (cookies != null)
{
HttpCookie newCookies = HttpCookie("user");
newCookies.Values.Add("userName", "Mini");
newCookies.Values.Add("email", "Mini@java163.cn");
newCookies.Expires = DateTime.Now.AddMilliseconds(5000); //失效时间=当前时间+5毫秒
Response.Cookies.Add(newCookies);
}

//（查）获取一个Cookies
HttpCookie cookies = Request.Cookies["user"];
if (cookies != null)
{
Response.Write("userName = " + cookies["userName"]);
Response.Write("<br>");
Response.Write("email = " + cookies["email"]);
}

//当前Cookies如果没有失效，则给当前Cookies增加生命周期
HttpCookie cookies = Request.Cookies["user"];
if (cookies != null)
{
cookies.Expires = DateTime.Now.AddMilliseconds(5000); //给当前Cookies增加5毫秒生命周期
Response.Cookies.Add(cookies);
}

//会员系统常用的判断用户是否登录
String userName = "";
String email = "";
HttpCookie cookies = Request.Cookies["user"];
if (cookies != null)
{
userName = cookies["userName"];
email = cookies["email"];
cookies.Expires = DateTime.Now.AddMilliseconds(5000); //给当前Cookies增加5毫秒生命周期
Response.Cookies.Add(cookies);
}
else
{
Response.Redirect("/Login.aspx");
}
Response.Write("userName = "+userName+"<br>email = "+email);