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作者：ITPUB论坛  2008-05-06

Cookie有三个属性需要注意一下：
  1. Domain 域
  2. Path 路径
  3. Expires 过期时间

  跨域操作需要设置域属性:
  Response.Cookies("MyCookie").Domain = "cnblogs.com"; (这里指的是泛域名)
  这样在其它二级域名下就都可以访问到了， ASP 和 ASP.NET 测试通过

  虚拟目录下访问：
  我在ASP端做了下测试，.NET的没试, 如果不指定Path属性， 不同虚拟目录下Cookie无法共享
  将Response.Cookies("MyCookie").Path = "/" 就可以了

  总的写法:

Response.Cookies("MyCookie").Domain = "cnblogs.com";
Response.Cookies("MyCookie").Path = "/"
Response.Cookies("MyCookie").Expires = Now + 365;
Response.Cookies("MyCookie")("Test") = "test";
.NET 清除Cookie
HttpCookie cookie = System.Web.HttpContext.Current.Request.Cookies[cookiename];
if (cookie != null)
{
cookie.Values.Clear();
SetUserCookieExpireTime(cookiename, -1);
cookie.Domain = _domain;
System.Web.HttpContext.Current.Response.Cookies.Set(cookie);
}
public static void SetUserCookieExpireTime(string key, int days)
{
System.Web.HttpContext.Current.Response.Cookies[key].Domain = _domain;
System.Web.HttpContext.Current.Response.Cookies[key].Path = _cookiepath;
System.Web.HttpContext.Current.Response.Cookies[key].Expires = DateTime.Now.AddDays(days);
}
.NET 添加/更新Cookie
public static void AddUserCookies(string key,string value, string cookiename, string domain)
{
HttpCookie cookie = System.Web.HttpContext.Current.Request.Cookies[cookiename];
if (cookie == null)
{
cookie = new HttpCookie(cookiename);
cookie.Domain = domain;
cookie.Path = _cookiepath;
cookie.Values.Add(key, value);
HttpContext.Current.Response.AppendCookie(cookie);
}
else
{
if (System.Web.HttpContext.Current.Request.Cookies[cookiename].Values[key] != null)
{
cookie.Values.Set(key, value);
}
else
{
cookie.Domain = domain;
cookie.Path = _cookiepath;
cookie.Values.Add(key, value);
HttpContext.Current.Response.AppendCookie(cookie);
}
}
}