using System;
using System.Collections.Generic;
using System.Web;

public class CookieHelper
{
    /// <summary>
    ///     写入
    /// </summary>
    /// <param name="n">cookie名</param>
    /// <param name="d">保存天数</param>
    /// <param name="l">需要保存的列表的值</param>
    public static void WriteIn(string n, int d, Dictionary<string, string> l)
    {
        var cookie = new HttpCookie(n); //初使化并设置Cookie的名称
        var dt = DateTime.Now;
        var ts = new TimeSpan(d, 0, 0, 0, 0); //过期时间为d天
        cookie.Expires = dt.Add(ts); //设置过期时间
        foreach (var item in l)
        {
            cookie.Values.Add(item.Key, item.Value);
        }
        HttpContext.Current.Response.AppendCookie(cookie);
    }

    /// <summary>
    ///     单个读出
    /// </summary>
    /// <param name="n">cookie名</param>
    /// <param name="v">第X个值</param>
    /// <returns></returns>
    public static string Read(string n, string v)
    {
        return HttpContext.Current.Request.Cookies[n][v];
    }

    /// <summary>
    ///     修改
    /// </summary>
    /// <param name="n">cookie名</param>
    /// <param name="c">需要修改的索引</param>
    /// <param name="v">需要修改的值</param>
    public static void ReWrite(string n, string c, string v)
    {
        //获取客户端的Cookie对象
        var cok = HttpContext.Current.Request.Cookies[n];

        if (cok != null)
        {
            cok.Values[c] = v;
            HttpContext.Current.Response.AppendCookie(cok);
        }
    }

    /// <summary>
    ///     新增
    /// </summary>
    /// <param name="n">cookie名</param>
    /// <param name="c">索引</param>
    /// <param name="v">值</param>
    public static void Add(string n, string c, string v)
    {
        //获取客户端的Cookie对象
        var cok = HttpContext.Current.Request.Cookies[n];

        if (cok != null)
        {
            //往Cookie里加入新的内容
            cok.Values.Set(c, v);
            HttpContext.Current.Response.AppendCookie(cok);
        }
    }

    /// <summary>
    ///     去除
    /// </summary>
    /// <param name="n">cookie名</param>
    /// <param name="c">索引</param>
    public static void Remove(string n, string c)
    {
        var cok = HttpContext.Current.Request.Cookies[n];
        if (cok != null)
        {
            cok.Values.Remove(c); //移除
            HttpContext.Current.Response.AppendCookie(cok);
        }
    }

    /// <summary>
    ///     删除
    /// </summary>
    /// <param name="n">cookie名</param>
    public static void Delete(string n)
    {
        var cok = HttpContext.Current.Request.Cookies[n];
        if (cok != null)
        {
            var ts = new TimeSpan(-1, 0, 0, 0);
            cok.Expires = DateTime.Now.Add(ts); //通过设置过期时间，删除整个Cookie
            HttpContext.Current.Response.AppendCookie(cok);
        }
    }
}