//寫入
protected void Button2_Click(object sender, EventArgs e)
{
HttpCookie cookie=new HttpCookie("MyCook");//初使化並設置Cookie的名稱
DateTime dt=DateTime.Now;
TimeSpan ts = new TimeSpan(0, 0, 1,0,0);//過期時間爲1分鐘
cookie.Expires = dt.Add(ts);//設置過期時間
cookie.Values.Add("userid", "userid_value");
cookie.Values.Add("userid2","userid2_value2");
Response.AppendCookie(cookie);
//輸出該Cookie的所有內容
//Response.Write(cookie.Value); //輸出爲:userid=userid_value&userid2=userid2_value2
}
//讀取
protected void Button1_Click(object sender, EventArgs e)
{
// HttpCookie cokie = new HttpCookie("MyCook");//初使化
if (Request.Cookies["MyCook"]!=null)
{
//Response.Write("Cookie中鍵值爲userid的值:" + Request.Cookies["MyCook"]["userid"]);//整行
//Response.Write("Cookie中鍵值爲userid2的值" + Request.Cookies["MyCook"]["userid2"]);
Response.Write(Request.Cookies["MyCook"].Value);//輸出全部的值
}
}
//修改Cookie
protected void Button3_Click(object sender, EventArgs e)
{
//獲取客戶端的Cookie對象
HttpCookie cok = Request.Cookies["MyCook"];
if (cok != null)
{
//修改Cookie的兩種方法
cok.Values["userid"] = "alter-value";
cok.Values.Set("userid", "alter-value");
//往Cookie里加入新的內容
cok.Values.Set("newid", "newValue");
Response.AppendCookie(cok);
}
}
//刪除Cookie
protected void Button4_Click(object sender, EventArgs e)
{
HttpCookie cok = Request.Cookies["MyCook"];
if (cok != null)
{
if (!CheckBox1.Checked)
{
cok.Values.Remove("userid");//移除鍵值爲userid的值
}
else
{
TimeSpan ts = new TimeSpan(-1, 0, 0, 0);
cok.Expires = DateTime.Now.Add(ts);//刪除整個Cookie,只要把過期時間設置爲現在
}
Response.AppendCookie(cok);
}
}
以前寫程序都沒去關注Cookie的應用,因爲ASP.NET在客戶端保存數據的方式比較多,且以前寫的程序都沒有用到Cookie,所以就沒去了解,今天有個程序總是用Cookie出錯。現在在網上查查Cookie的常用方法。
Cookie的用法也和ASP中差不多。比如我們建立一個名爲user,值爲111的cookie
HttpCookie cookie = new HttpCookie("user");
cookie.Value = "111";
Response.AppendCookie(cookie);
我們取出Cookie值也很簡單
HttpCookie cookie = Request.Cookies["user"];
cookieValue = cookie.Value;
有時候我們想在一個Cookie中儲存多個信息,那也沒有問題。比如我們在名爲user的cookie下加多個信息
HttpCookie cookie = new HttpCookie("user");
cookie.Values.Add("name","222");
cookie.Values.Add("pwd","333");
cookie.Values.Add("member","admin");
Response.AppendCookie(cookie);
從客戶端獲取取信息也一樣簡單
HttpCookie cookie = Request.Cookies["user"];
value1 = cookies.Values["name"];
value2 = cookies.Values["pwd"];