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); } } }
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