今天发现在本机上可以删除Cookie，只是把Cookie时间改为过期cookie.Expires = DateTime.Now.AddDays(-7);即可，但是部署到服务器之后一直无法删除，后来发现问题

public static void Remove(string cookieName, string domain)
        {
            //HttpCookie cookie = new HttpCookie(cookieName);
            //HttpCookie cookie = System.Web.HttpContext.Current.Request.Cookies[cookieName];
            HttpCookie cookie = new HttpCookie(cookieName);

            cookie.Expires = DateTime.Now.AddDays(-7);
            cookie.Domain = domain;
          
            //HttpContext.Current.Response.Cookies.Add(cookie);
            HttpContext.Current.Response.Cookies.Set(cookie);
            
            //System.Web.HttpContext.Current.Request.Cookies.Set(cookie);

        }

HttpCookie cookie = System.Web.HttpContext.Current.Request.Cookies[cookieName];

改为以下代码就可以了
 HttpCookie cookie = new HttpCookie(cookieName);