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CookiesHelper.cs

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

namespace TLibrary.ObjectHelper
{
     public class CookiesHelper
    {

         #region 获取Cookie

         /// <summary>
         /// 获得Cookie的值
         /// </summary>
         /// <param name="cookieName"></param>
         /// <returns></returns>
         public static string GetCookieValue( string cookieName)
        {
             return GetCookieValue(cookieName, null );
        }

         /// <summary>
         /// 获得Cookie的值
         /// </summary>
         /// <param name="cookieName"></param>
         /// <param name="key"></param>
         /// <returns></returns>
         public static string GetCookieValue( string cookieName, string key)
        {
            HttpRequest request = HttpContext.Current.Request;
             if (request != null )
                 return GetCookieValue(request.Cookies[cookieName], key);
             return "" ;
        }

         /// <summary>
         /// 获得Cookie的子键值
         /// </summary>
         /// <param name="cookie"></param>
         /// <param name="key"></param>
         /// <returns></returns>
         public static string GetCookieValue(HttpCookie cookie, string key)
        {
             if (cookie != null )
            {
                 if ( ! string .IsNullOrEmpty(key) && cookie.HasKeys)
                     return cookie.Values[key];
                 else
                     return cookie.Value;
            }
             return "" ;
        }

         /// <summary>
         /// 获得Cookie
         /// </summary>
         /// <param name="cookieName"></param>
         /// <returns></returns>
         public static HttpCookie GetCookie( string cookieName)
        {
            HttpRequest request = HttpContext.Current.Request;
             if (request != null )
                 return request.Cookies[cookieName];
             return null ;
        }

         #endregion

         #region 删除Cookie

         /// <summary>
         /// 删除Cookie
         /// </summary>
         /// <param name="cookieName"></param>
         public static void RemoveCookie( string cookieName)
        {
            RemoveCookie(cookieName, null );
        }

         /// <summary>
         /// 删除Cookie的子键
         /// </summary>
         /// <param name="cookieName"></param>
         /// <param name="key"></param>
         public static void RemoveCookie( string cookieName, string key)
        {
            HttpResponse response = HttpContext.Current.Response;
             if (response != null )
            {
                HttpCookie cookie = response.Cookies[cookieName];
                 if (cookie != null )
                {
                     if ( ! string .IsNullOrEmpty(key) && cookie.HasKeys)
                        cookie.Values.Remove(key);
                     else
                        response.Cookies.Remove(cookieName);
                }
            }
        }

         #endregion

         #region 设置/修改Cookie

         /// <summary>
         /// 设置Cookie子键的值
         /// </summary>
         /// <param name="cookieName"></param>
         /// <param name="key"></param>
         /// <param name="value"></param>
         public static void SetCookie( string cookieName, string key, string value)
        {
            SetCookie(cookieName, key, value, null );
        }

         /// <summary>
         /// 设置Cookie值
         /// </summary>
         /// <param name="key"></param>
         /// <param name="value"></param>
         public static void SetCookie( string key, string value)
        {
            SetCookie(key, null , value, null );
        }

         /// <summary>
         /// 设置Cookie值和过期时间
         /// </summary>
         /// <param name="key"></param>
         /// <param name="value"></param>
         /// <param name="expires"></param>
         public static void SetCookie( string key, string value, DateTime expires)
        {
            SetCookie(key, null , value, expires);
        }

         /// <summary>
         /// 设置Cookie过期时间
         /// </summary>
         /// <param name="cookieName"></param>
         /// <param name="expires"></param>
         public static void SetCookie( string cookieName, DateTime expires)
        {
            SetCookie(cookieName, null , null , expires);
        }

         /// <summary>
         /// 设置Cookie
         /// </summary>
         /// <param name="cookieName"></param>
         /// <param name="key"></param>
         /// <param name="value"></param>
         /// <param name="expires"></param>
         public static void SetCookie( string cookieName, string key, string value, DateTime ? expires)
        {
            HttpResponse response = HttpContext.Current.Response;
             if (response != null )
            {
                HttpCookie cookie = response.Cookies[cookieName];
                 if (cookie != null )
                {
                     if ( ! string .IsNullOrEmpty(key) && cookie.HasKeys)
                        cookie.Values.Set(key, value);
                     else
                         if ( ! string .IsNullOrEmpty(value))
                            cookie.Value = value;
                     if (expires != null )
                        cookie.Expires = expires.Value;
                    response.SetCookie(cookie);
                }
            }

        }

         #endregion

         #region 添加Cookie

         /// <summary>
         /// 添加Cookie
         /// </summary>
         /// <param name="key"></param>
         /// <param name="value"></param>
         public static void AddCookie( string key, string value)
        {
            AddCookie( new HttpCookie(key, value));
        }

         /// <summary>
         /// 添加Cookie
         /// </summary>
         /// <param name="key"></param>
         /// <param name="value"></param>
         /// <param name="expires"></param>
         public static void AddCookie( string key, string value, DateTime expires)
        {
            HttpCookie cookie = new HttpCookie(key, value);
            cookie.Expires = expires;
            AddCookie(cookie);
        }

         /// <summary>
         /// 添加为Cookie.Values集合
         /// </summary>
         /// <param name="cookieName"></param>
         /// <param name="key"></param>
         /// <param name="value"></param>
         public static void AddCookie( string cookieName, string key, string value)
        {
            HttpCookie cookie = new HttpCookie(cookieName);
            cookie.Values.Add(key, value);
            AddCookie(cookie);
        }

         /// <summary>
         /// 添加为Cookie集合
         /// </summary>
         /// <param name="cookieName"> Cookie名称 </param>
         /// <param name="expires"> 过期时间 </param>
         public static void AddCookie( string cookieName, DateTime expires)
        {
            HttpCookie cookie = new HttpCookie(cookieName);
            cookie.Expires = expires;
            AddCookie(cookie);
        }

         /// <summary>
         /// 添加为Cookie.Values集合
         /// </summary>
         /// <param name="cookieName"></param>
         /// <param name="key"></param>
         /// <param name="value"></param>
         /// <param name="expires"></param>
         public static void AddCookie( string cookieName, string key, string value, DateTime expires)
        {
            HttpCookie cookie = new HttpCookie(cookieName);
            cookie.Expires = expires;
            cookie.Values.Add(key, value);
            AddCookie(cookie);
        }

         /// <summary>
         /// 添加Cookie
         /// </summary>
         /// <param name="cookie"></param>
         public static void AddCookie(HttpCookie cookie)
        {
            HttpResponse response = HttpContext.Current.Response;
             if (response != null )
            {
                 // 指定客户端脚本是否可以访问[默认为false]
                cookie.HttpOnly = true ;
                 // 指定统一的Path，比便能通存通取
                cookie.Path = " / " ;
                 // 设置跨域,这样在其它二级域名下就都可以访问到了
                 // cookie.Domain = "chinesecoo.com";
                response.AppendCookie(cookie);
            }
        }

         #endregion
    }
}

代码注意事项:

1. Cookies添加的时候注意一个Cookie可以添加多个子键

2. 假如你不显示的设置 HttpCookie.Expires 那么此 cookie 生命期即为浏览器进程——关闭浏览器则过期

3. 需要了解HttpCookie.Domain和HttpCookie.Path这两个属性，对于跨域和存储路径等高级应用有帮助

以下看实际调用代码

页面加载

     protected void Page_Load( object sender, EventArgs e)
    {
         if ( ! IsPostBack)
        {
            HttpCookie Cookie = CookiesHelper.GetCookie( " UserInfo " );
             if (Cookie != null )
            {
                 this .txtUserName.Value = Cookie.Values[ " uName " ];
            }
        }
    }

代码说明：

1. this.txtUserName是界面上输入用户名的控件，换成自己的控件名称就行；

2. UserInfo为Cookie的名称，uName为Cookie的子键。

这段代码的功能是在页面加载的时候显示用户Cookie中记录的用户名，这里也可以做成连密码一起记录然后在这里显示，这样用户就可以直接点登录按钮了

登录验证

         string uName = this .txtUserName.Value.Trim();

         // 验证用户名密码
         if (IsLogin(uName, this .txtPass.Value.Trim()))
        {
             // 记住我的名字
             if ( ! string .IsNullOrEmpty(Request[ " remUsername " ]))
            {
                HttpCookie Cookie = CookiesHelper.GetCookie( " UserInfo " );
                 if (Cookie == null )
                {
                    Cookie = new HttpCookie( " UserInfo " );
                    Cookie.Values.Add( " uName " , uName);
                     // 设置Cookie过期时间
                    Cookie.Expires = DateTime.Now.AddDays( 365 );
                    CookiesHelper.AddCookie(Cookie);
                }
                 else if ( ! Cookie.Values[ " uName " ].Equals(uName))
                    CookiesHelper.SetCookie( " UserInfo " , " uName " , uName);
            }
            Response.Redirect( " ~/index.aspx " );
        }

代码说明：

补充

1. 根据实际的经验，一般的情况下在本地调试不设置Domain属性，挂上服务器上配上域名之后就得指定Domain参数了，否则Cookies出不来的。（2008-11-24 10:32:00）

结束

发这文的时候犹豫了一下，说实在的查下MSDN基本上就搞定了，但是从别人的字典里到自己的字典里还是不一样的，学习开心，多多翻下MSDN :)

1. this.txtUserName和this.txtPass是界面上输入用户名和密码的控件，换成自己的控件名称就行；

2. IsLogin方法是用来验证用户名和密码是否正确的，这里替换成自己的验证方法就行了。

3. Request["remUsername"]是获得界面上是否选中了[记住我的名称]复选框

这段代码的功能是在用户登录成功之后，如果选中了记住登录用户名就把用户名存入客户端的Cookie中，并设置过期时间为1年。

本文转自over140 51CTO博客，原文链接：http://blog.51cto.com/over140/586470，如需转载请自行联系原作者

ASP.NET Cookies简单应用 [ASP.NET | Cookies]

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补充

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