在程序中使用Cookie集合-原创手记-慕课网

在程序开发中，Insus.NET使用Cookie时，很少使用如http://www.cnblogs.com/insus/articles/2055310.html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。

InsusBizusing 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：

View Code 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:

View Code 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。