转贴：ASP.NETCookies简单应用记住用户名和密码

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转自：http://www.cnblogs.com/angells/archive/2009/12/05/1617681.html

不要试图给Password类型的TextBox赋值!

在asp.net中，不要试图给Password类型的TextBox控件赋值! 无论是在设计或是运行时，都不可以的。
猜测的原因是，password类型的TextBox控件从根本上，没有Text属性的Set方法，只有Get !!
同样，html中的Input控件，如果设置为ruanat="server"，password类型的Input控件也是一样。无论是在设计或是运行时，都不容许设置它的值。

解决办法:txtPassword.Attributes["value"] = "123";

前言

一般只要有会员、用户机制的网站或论坛在登录的时候都会有这么一个复选框——[记住我的名字 | 两周内不再登陆 | 在此计算机上保存我的信息]，说法较多，实现起来差不多，本文做了一个简单的例子并附带了一个C# Cookies帮助类 CookiesHelper.cs和实现代码片段，希望能对初学者有帮助: )

正文

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");
        }