【C#】【Cookie】Cookie设置与读取

依赖

using System.Web;

设置Cookie

1.新建Cookie对象

HttpCookie cookie = new HttpCookie("UserInfo");

“UserInfo”是这个Cookie的名称

2.设置Cookie有效时间

 cookie.Expires = DateTime.Now.AddDays(15);

3.设置Cookie属性与值

 cookie.Values["UserName"] = "萌狼蓝天";

“UserName”是UserInfo的熟悉，“萌狼蓝天”是该属性对应的值

为了避免中文乱码，应该对值进行URL编码（使用时需要URL解码）

 cookie.Values["UserName"] = HttpUtility.UrlEncode("萌狼蓝天");

获取Cookie

1.获取Cookie对象

HttpCookie cookie = Request.Cookies["UserInfo"];

UserInfo 是设置的Cookie名

2.获取Cookie值

HttpCookie cookie = Request.Cookies["UserInfo"];
lblUserName.Text = cookie.Values["UserName"]

UserName是UserInfo的属性

为了避免中文乱码问题，应在设置时使用URL编码，则获取时，需使用URL解码

lblUserName.Text = HttpUtility.UrlDecode(cookie.Values["UserName"]);

判断是否存在某个Cookie

//取cookie
HttpCookie cookie = Request.Cookies["UserInfo"];
//判断Cookie是否为空
if (cookie != null)
{
     //如果不为空，说明有Cookie，此时跳转到userticket.aspx
     Response.Redirect("userticket.aspx", false);
}