//方式1:
Response.Cookies["username"].value="gggg"; Response.Cookies["username"].Expires=DateTime.MaxValue; //方式2: HttpCookie acookie = new HttpCookie("last"); acookie.Value="a"; acookie..Expires=DateTime.MaxValue; Response.Cookies.Add(acookie); //多值Cookie的写法 //方式1: Response.Cookies["userinfo1"]["name"].value="aaa"; Response.Cookies["userinfo1"]["last"].value="a"; Response.Cookies["userinfo1"].Expires=DateTime.MaxValue; //方式2: HttpCookie cookie = new HttpCookie("userinfo1"); cookie.Values["name"]="aaa"; cookie.Values["last"]="a"; cookie.Expires=DateTime.MaxValue; //cookie.Expires = System.DateTime.Now.AddDays(1);//设置过期时间 1天 Response.Cookies.Add(cookie); 

if (Request.Cookies["userName"]!=null) { string str = Request.Cookies("userName").Value; } //多值Cookie的读取 if (Request.Cookies["userInfo1"]!=null ) { string name=Request.Cookies["userInfo1"]["name"]; string last=Request.Cookies["userInfo1"]["last"]; } //读取 Cookie 集合 for(int i = 0 ;i<Request.Cookies.Count ;i++) { HttpCookie cookies = Request.Cookies; Response.Write("name="+cookies.Mame+"<br/>"); if (cookies.HasKeys )//是否有子键  { System.Collections.Specialized.NameValueCollection NameColl = aCookie.Values ; for(int j=0;j<NameColl.Count;j++) { Response.Write("子键名="+ NameColl.AllKey[j] +"<br/>"); Response.Write("子键值="+ NameColl[j] +"<br/>"); } } else { Response.Write("value="+cookies.Value+"<br/>"); } } 

//删除cookie下的属性HttpCookie acookie=Request.Cookies["Info"]; acookie.Values.Remove("userid"); acookie.Expires = DateTime.Now.AddDays(1); Response.Cookies.Add(acookie); //删除所有cookie，就是设置过期时间为现在就行了  int limit=Request.Cookies.Count - 1; for(int i=0;i<limit;i++) { acookie = Request.Cookies(i) acookie.Expires = DateTime.Now.AddDays(-1) Response.Cookies.Add(acookie) } 

using System;
using System.Collections.Generic; using System.Linq; using System.Text; using System.Web; using System.Collections.Specialized; namespace Core.Common.Web { /// <summary> /// Cookie静态操作类 /// </summary>  public static class Cookie { #region 静态方法 /// <summary> /// 创建或修改COOKIE对象并赋Value值 /// </summary> /// <param name="strCookieName">COOKIE对象名</param> /// <param name="strValue">COOKIE对象Value值</param> /// <remarks> /// 对COOKIE修改必须重新设Expires /// </remarks>  public static void SetObject(string strCookieName, string strValue) { SetObject(strCookieName, 1, strValue); } /// <summary> /// 创建或修改COOKIE对象并赋Value值 /// </summary> /// <param name="strCookieName">COOKIE对象名</param> /// <param name="iExpires"> /// COOKIE对象有效时间（秒数） /// 1表示永久有效，0和负数都表示不设有效时间 /// 大于等于2表示具体有效秒数 /// 86400秒 = 1天 = （60*60*24） /// 604800秒 = 1周 = （60*60*24*7） /// 2593000秒 = 1月 = （60*60*24*30） /// 31536000秒 = 1年 = （60*60*24*365） /// </param> /// <param name="strValue">COOKIE对象Value值</param> /// <remarks> /// 对COOKIE修改必须重新设Expires /// </remarks>  public static void SetObject(string strCookieName, int iExpires, string strValue) { HttpCookie objCookie = new HttpCookie(strCookieName.Trim()); objCookie.Value = HttpContext.Current.Server.UrlEncode(strValue.Trim()); if (iExpires > 0) { if (iExpires == 1) { objCookie.Expires = DateTime.MaxValue; } else { objCookie.Expires = DateTime.Now.AddSeconds(iExpires); } } HttpContext.Current.Response.Cookies.Add(objCookie); } /// <summary> /// 创建COOKIE对象并赋多个KEY键值 /// </summary> /// <param name="strCookieName">COOKIE对象名</param> /// <param name="iExpires"> /// COOKIE对象有效时间（秒数） /// </param> /// <param name="KeyValue">键/值对集合</param>  public static void SetObject(string strCookieName, int iExpires, NameValueCollection KeyValue) { HttpCookie objCookie = new