写cookie
1 HttpCookie cookie = new HttpCookie("Info");//定义cookie对象以及名为Info的项
2 DateTime dt = DateTime.Now;//定义时间对象
3 TimeSpan ts=new TimeSpan(1,0,0,0);//cookie有效作用时间，具体查msdn
4 cookie.Expires = dt.Add(ts);//添加作用时间
5 cookie.Values.Add("user","cxbkkk");//增加属性
6 cookie.Values.Add("userid","1203");
7 Response.AppendCookie(cookie);//确定写入cookie中
读取cookie
1 if(Request.Cookies["Info"]!=null)
2 {
3 string temp=Convert.ToString(Request.Cookies["Info"].Values["user"])+" "+Convert.ToString(Request.Cookies["Info"].Values["userid"]);
4 //读全部就用Request.Cookies["Info"].Value)
5 if(temp=="")
6 {
7 Response.Write("空");
8 }
9 else
10 Response.Write(temp);
11 }
12 else
13 {
14 Response.Write("error");
15 }
修改cookie
1 Response.Cookies["Info"]["user"] = "2";
2 Response.Cookies["Info"].Expires = DateTime.Now.AddDays(1);
删除cookie下的属性
1 HttpCookie acookie=Request.Cookies["Info"];
2 acookie.Values.Remove("userid");
3 acookie.Expires = DateTime.Now.AddDays(1);
4 Response.Cookies.Add(acookie);
删除所有cookie，就是设置过期时间为现在就行了
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 }
以下是在工作中遇到的问题：
点击支持按扭时，数量加1。点过则不允许在点!
#region btn_AddSupports_Click
/// <summary>
///
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btn_AddSupports_Click(object sender, System.Web.UI.ImageClickEventArgs e)
{
string cookieName = "zhuhai_zhidao_user_addsupports_" + this.questionId;
if (Request.Cookies[cookieName] == null)
{
HttpCookie cookie = new HttpCookie(cookieName);
Response.Cookies.Add(cookie);
if (this.questionId > 0)
{
bool result = DAL.ZhiDao.Question.AddSupports(this.questionId, this.SystemId);
if (result)
{
this.item.Supports++;
}
}
this.lbl_support.Text = this.item.Supports.ToString();
this.lbl_Message.Text = "谢谢支持！";
}
else
{
this.lbl_Message.Text = "您已点击过！";
}
}
#endregion