寫入和讀取cookie數組?

Cookie是一段文本信息,在客戶端存儲 Cookie 是 ASP.NET 的會話狀態將請求與會話關聯的方法之一。Cookie 也可以直接用於在請求之間保持數據，但數據隨後將存儲在客戶端並隨每個請求一起發送到服務器。瀏覽器對 Cookie 的大小有限制，因此，只有不超過 4096 字節才能保證被接受。

編寫Cookie

 

//方式1:
Response.Cookies["username"].value="mike";
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的寫法

//方式1:
Response.Cookies["userinfo1"]["name"].value="mike";
Response.Cookies["userinfo1"]["last"].value="a";
Response.Cookies["userinfo1"].Expires=DateTime.MaxValue;

//方式2:
HttpCookie cookie = new HttpCookie("userinfo1");
cookie.Values["name"]="mike";
cookie.Values["last"]="a";
cookie.Expires=DateTime.MaxValue;
//cookie.Expires = System.DateTime.Now.AddDays(1);//設置過期時間 1天
Response.Cookies.Add(cookie);

 

讀取Cookie
Internet Explorer 將站點的 Cookie 保存在文件名格式爲 <user>@<domain>.txt 的文件中，其中 <user> 是您的帳戶名。
注意:在獲取Cookie的值之前，應該確保該 Cookie 確實存在。否則，您將得到一個異常

 

If (Request.Cookies["userName"]!=null)
{
string str = Request.Cookies("userName").Value;
}

//多值Cookie的讀取
If ( Request.Cookies["userInfo1"]!=null )
{
string name=Request.Cookies["userInfo1"]["name"];
string last=Request.Cookies["userInfo1"]["last"];
}

//讀取 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 )//是否有子鍵
    {
        System.Collections.Specialized.NameValueCollection NameColl
                                             = aCookie.Values ;
        for(int j=0;j<NameColl.Count;j++)
        {
            Response.Write("子鍵名="+ NameColl.AllKey[j] +"<br/>");
            Response.Write("子鍵值="+ NameColl[j] +"<br/>");
        }

    }
    else
    {
        Response.Write("value="+cookies.Value+"<br/>");       
    }
}

 

運行此代碼時，可看到一個名爲“ASP.NET_SessionId”的Cookie，ASP.NET用這個 Cookie 來保存您的會話的唯一標識符。

修改 Cookie
修改的方法與創建方法相同

刪除 Cookie
將其有效期設置爲過去的某個日期。當瀏覽器檢查 Cookie 的有效期時，就會刪除這個已過期的 Cookie。

 

HttpCookie cookie = new HttpCookie("userinfo1");
cookie.Expires=DateTime.Now.AddDays(-30);
Response.Cookies.Add(cookie);

============================實例。

//----------寫入Cookie
HttpCookie cookie = new HttpCookie("userinfo1");
        cookie.Expires = System.DateTime.Now.AddMinutes(2);//設置過期時間
        for (int i = 0; i < 20; i++)
        {
           
            cookie.Values["Val" +i.ToString()] = i.ToString();          
            Response.Cookies.Add(cookie);
        }

//讀取 Cookie 集合
        for (int i = 0; i < Request.Cookies.Count; i++)
        {
            if (Request.Cookies.AllKeys[i] == "userinfo1")
            {

                HttpCookie cookies = Request.Cookies["userInfo1"];
                Response.Write("name=" + cookies.Name + "<br/>");
                //Response.Write("name=" + cookies.Value + "<br/>");

                if (cookies.HasKeys)//是否有子鍵
                {
                    System.Collections.Specialized.NameValueCollection NameColl = cookies.Values;
                    for (int j = 0; j < NameColl.Count; j++)
                    {
                        Response.Write("子鍵名=" + NameColl.AllKeys[j] + "<br/>");
                        Response.Write("子鍵值=" + NameColl[j] + "<br/>");
                    }

                }
                else
                {
                    Response.Write("value=" + cookies.Value + "<br/>");
                }
            }
         
        }

/////********************************************************************
修改cookie
1 Response.Cookies["Info"]["user"] = "2";
2 Response.Cookies["Info"].Expires = DateTime.Now.AddDays(1);        刪除cookie下的屬性
1 HttpCookie acookie=Request.Cookies["Info"];
2 acookie.Values.Remove("userid");
3 acookie.Expires = DateTime.Now.AddDays(1);
4 Response.Cookies.Add(acookie);        刪除所有cookie，就是設置過期時間爲現在就行了
1 int limit=Request.Cookies.Count - 1;
2 for(int i=0;i<limit;i++)
3 {
4     acookie = Request.Cookies(i)
5     acookie.Expires = DateTime.Now.AddDays(-1)
6     Response.Cookies.Add(acookie)
7 }        這下不用到處找了