ASP.NET Cookies简单应用 记住用户名和密码

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: )

推荐文章

1. 林信良 index.dat文件剖析 较深入分析cookies在index.dat中存入情况

2. MSDN —— ASP.NET Cookie 概述 很全面很详细的介绍了Cookies

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");

}

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。

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。