Cookies用法
public partial class glassku_Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)//如果页面不是回调,则执行Add语句;再点击Button1_Click事件,执行二次加载,就不再执行Add语句了。
{
DropDownList1.Items.Add("北京");
DropDownList1.Items.Add("上海");
DropDownList1.Items.Add("杭州");
DropDownList1.Items.Add("成都");
DropDownList1.Items.Add("重庆");
//建立单值Cookies
//法一:
HttpCookie mycookie1 = new HttpCookie("c1");
mycookie1.Value = "zhang";
mycookie1.Expires = DateTime.Now.AddDays(1);
Response.Cookies.Add(mycookie1);
//法二:
HttpCookie mycookie2 = new HttpCookie("c2", "zhangyj");
mycookie2.Expires = DateTime.Now.AddDays(1);
Response.Cookies.Add(mycookie2);
// 法三:
Response.Cookies["username"].Value = Server.UrlEncode("张亚京");
Response.Cookies["username"].Expires = DateTime.Now.AddDays(1);
//建立多值Cookies
//法一:
HttpCookie mycookie3 = new HttpCookie("a");
mycookie3.Values["a1"] = "zhang";
mycookie3.Values["a2"] = "yj";
mycookie3.Expires = DateTime.Now.AddDays(1);
Response.Cookies.Add(mycookie3);
// 法二:
Response.Cookies["b"]["b1"] = "zhang";
Response.Cookies["b"]["b2"] = "yajing";
Response.Cookies["b"].Expires = DateTime.Now.AddDays(1);
}
}
protected void Button1_Click(object sender, EventArgs e)
{
Label1.Text = Request.Cookies["c1"].Value + "<br>"
+ Request.Cookies["c2"].Value + "<br>"
+ Server.UrlDecode(Request.Cookies["username"].Value) + "<br>"
+ Request.Cookies["a"].Value + "<br>"
+ Request.Cookies["b"].Value + "<br>"
+ "选择的城市是:" + DropDownList1.SelectedValue.ToString();
}
}
页面输出结果如下:
zhang
zhangyj
张亚京
a1=zhang&a2=yj
b1=zhang&b2=yajing
选择的城市是:北京
for(int i = 0 ;i<Request.Cookies.Count ;i++)
{
HttpCookie cookies = Request.Cookies[i];
Response.Write("name="+cookies.Mame+"<br>");
if (cookies.HasKeys )//是否有子键
{
System.Collections.Specialized.NameValueCollection NameColl
= aCookie.Values ;
for(int j=0;j<NameColl.Count;j++)
{
Response.Write("子键名="+ NameColl.AllKey[j] +"<br>");
Response.Write("子键值="+ NameColl[j] +"<br>");
}
}
else
{
Response.Write("value="+cookies.Value+"<br>");
}
}