在程序中使用Cookie集合(定义/新建/删除)及案例讲解

在程序开发中，使用cookie时，很少使用如的写法。习惯写成cookie集合，什么叫做cookie集合，即是说一个cookie，它拥有多个值。下面一系列演示，是怎样创建cookie集合与使用。

insusbiz
using system;
using system.web;
/// <summary>
/// summary description for insusbiz
/// </summary>
public class insusbiz
{
private static httpresponse response
{
get
{
return httpcontext.current.response;
}
}
private static httprequest request
{
get
{
return httpcontext.current.request;
}
}
//定义一个cookie集合
private static httpcookie insuscookie
{
get
{
return request.cookies["insuscookie"] as httpcookie;
}
set
{
if (request.cookies["insuscookie"] != null)
{
request.cookies.remove("insuscookie");
}
response.cookies.add(value);
}
}
//new cookie集合
private static httpcookie newinsuscookie
{
get
{
httpcookie httpcookie = new httpcookie("insuscookie");
return httpcookie;
}
}
//remove cookie集合
public static void removeinsuscookie()
{
if (insuscookie == null)
response.cookies.remove("insuscookie");
else
response.cookies["insuscookie"].expires = datetime.now.adddays(-1);
}
//创建一个cookie，判断用户登录状态
public static bool loginok
{
get
{
return insuscookie == null ? false : bool.parse(insuscookie.values["loginok"]);
}
set
{
httpcookie httpcookie = insuscookie == null ? newinsuscookie : insuscookie;
httpcookie.values["loginok"] = value.tostring();
insuscookie = httpcookie;
}
}
//创建登录用户的帐号,整站使用
public static string memberid
{
get
{
return insuscookie == null ? string.empty : insuscookie.values["memberid"];
}
set
{
httpcookie httpcookie = insuscookie == null ? newinsuscookie : insuscookie;
httpcookie.values["memberid"] = value;
insuscookie = httpcookie;
}
}
//如果还有整站使用的cookie可以写在此，可以参考loginok或memberid的写法。
}

在应用时，你会看到insusbiz类别下有loginok，memberid和removeinsuscookie等属性：
 
在程序中怎样使用这些cookie呢？如在登录验证成功之后，你需要把登录状态与登录的id写入cookie中
insusbiz.loginok = true;
insusbiz.memberid = xxx;
在判断用户是否登录时，可以这个去判断：

protected void page_load(object sender, eventargs e)
{
if (!insusbiz.loginok)
{
//你没有登录
}
}

如果想在任何位置，想取出登录id:

string memberid = insusbiz.memberid;

最后想说的，你想移除cooke,就可以使用insusbiz.removeinsuscookie就可以了，因为它会把cookie的过期时间变更为过去。这个通常应用在用户sign out的事件上。