ASP.NET Cookie的使用汇总

１、解决Cookie更新滞后的问题
　　先写入一个过期的Cookie，再添加一个新的Cookie就ＯＫ了。示例代码如下所示：
protected void btnSearch_Click(object sender, EventArgs e) { //生成条件表达式 string where = bll.GetWhereSql(Int32.Parse(ddlCate.SelectedValue), Int32.Parse(ddlHarbor.SelectedValue), 0, 0, ddlState.SelectedValue, tbKeyword.Text.Trim()); //判断条件Cookie是否为空，如不为空，则移除现有条件Cookie if (Request.Cookies["Admin_HarborSpot_Where"] != null) { RemoveWhereCookie(where);//移除现有条件Cookie } //设置一个新的条件Cookie SetWhereCookie(where); BindData(true); } //设置条件Cookie private void SetWhereCookie(string where) { HttpCookie cookie = new HttpCookie("Admin_HarborSpot_Where"); cookie.Value = where; cookie.Expires = DateTime.Now.AddDays(1d); Response.Cookies.Add(cookie); } //移除现存的条件Cookie private void RemoveWhereCookie(string where) { HttpCookie cookie = Request.Cookies["Admin_HarborSpot_Where"]; cookie.Value = where; cookie.Expires = DateTime.Now.AddDays(-3d); Response.Cookies.Add(cookie); }