关于HttpCookie

自：http://blog.csdn.net/myloy/archive/2009/08/27/4488398.aspx

HttpCookie 类获取和设置各 Cookie 的属性。 HttpCookieCollection 类提供存储、检索和管理多个 Cookie 的方法。

ASP.NET 包含两个内部 Cookie 集合。通过 HttpRequest 对象的 Cookies 集合访问的集合，包含以 Cookie 标头形式由客户端传输到服务器的 Cookie。通过 HttpResponse 对象的 Cookies 集合访问的集合包含一些新 Cookie，这些 Cookie 在服务器上创建并以 Set-Cookie HTTP 响应标头的形式传输到客户端。

Request:   以 Cookie 标头形式由客户端传输到服务器的 Cookie

Response:  Set-Cookie HTTP 响应标头的形式传输到客户端。

以前总是使用Session，现在也学着使用Cookies了，什么时候使用谁好就使用谁呗。

Response.Cookie("username").value="oys" 写入
username=Request.Cookies("username").value 读取

 

用SESSION比较方便
session("username")="oys" 写入
username=session("username") 读取

C# :

方法1:
Response.Cookies["username"].Value="oys";
Response.Cookies["username"].Expires=DateTime.Now.AddDays(1); //设置cookies的过期时间为1天

方法2:
System.Web.HttpCookie newcookie=new HttpCookie("username");
newcookie.Value="oys";
newcookie.Expires=DateTime.Now.AddDays(1);
Response.AppendCookie(newcookie);

创建带有子键的cookies:
System.Web.HttpCookie newcookie=new HttpCookie("user");
newcookie.Values["username"]="oys";
newcookie.Values["password"]="123";
newcookie.Expires=DateTime.Now.AddDays(1);
Response.AppendCookie(newcookie);

cookies的读取:

无子键读取:
if(Request.Cookies["username"]!=null)
{
Response.Write(Server.HtmlEncode(Request.Cookies["username"].Value));
}

有子键读取:
if(Request.Cookies["user"]!=null)
{
        HttpCookie user = Request.Cookies["user"];
        string username = user.Values["username"];
 Response.Write(Server.HtmlEncode(Request.Cookies["user"].Values["username"]));
}

实例：

protected void Page_Load(object sender, EventArgs e)
    {
        StringBuilder sb = new StringBuilder();
        // Get cookie from the current request.
        HttpCookie cookie = Request.Cookies.Get("DateCookieExample");
       
        // Check if cookie exists in the current request.
        if (cookie == null)
        {
            sb.Append("Cookie was not received from the client. ");
            sb.Append("Creating cookie to add to the response. <br/>");
            // Create cookie.
            cookie = new HttpCookie("DateCookieExample");
            // Set value of cookie to current date time.
            cookie.Value = DateTime.Now.ToString();
            // Set cookie to expire in 10 minutes.
            cookie.Expires = DateTime.Now.AddMinutes(10d);
            // Insert the cookie in the current HttpResponse.
            Response.Cookies.Add(cookie);
        }
        else
        {
            sb.Append("Cookie retrieved from client. <br/>");
            sb.Append("Cookie Name: " + cookie.Name + "<br/>");
            sb.Append("Cookie Value: " + cookie.Value + "<br/>");
            sb.Append("Cookie Expiration Date: " +
                cookie.Expires.ToString() + "<br/>");
        }
        Label1.Text = sb.ToString();
    }

 

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