aspnetcore之session

 
startUp中
#region AspNetCore中使用Session

            services.AddDistributedMemoryCache();
            services.AddSession(option =>
            {
                option.IdleTimeout = TimeSpan.FromMinutes(3);
                option.Cookie.Name = "MySid";
            });

            #endregion

app.UseSession();

Controller中

#region  AspnetCore中使用Session

        public IActionResult About()
        {
            var UserInfo = "我的NetCore之Session";

            HttpContext.Session.Set("SessionKey", System.Text.Encoding.UTF8.GetBytes(UserInfo));

            return View();
        }
        public IActionResult Contact()
        {
            var userInfo = string.Empty;
            if (HttpContext.Session.TryGetValue("SessionKey", out var bt))
            {
                userInfo = System.Text.Encoding.UTF8.GetString(bt);
            }
            ViewData["Message"] = string.IsNullOrWhiteSpace(userInfo) ? "Session获取为空" : userInfo;
            return View();
        }
        #endregion

接下来如果直接进入Contact页面时会获取不到session：

先运行About获取到session，再运行Contact时，获取到session

另一种扩展方法

public static class PublicExtensions
     {
         #region ISession扩展
 
         /// <summary>
         /// 设置session
         /// </summary>
         /// <typeparam name="T"></typeparam>
         /// <param name="session"></param>
         /// <param name="key"></param>
         /// <param name="val"></param>
         /// <returns></returns>
         public static bool Set<T>(this ISession session, string key, T val)
         {
             if (string.IsNullOrWhiteSpace(key) || val == null) { return false; }
 
             var strVal = JsonConvert.SerializeObject(val);
             var bb = Encoding.UTF8.GetBytes(strVal);
             session.Set(key, bb);
             return true;
         }
 
         /// <summary>
         /// 获取session
         /// </summary>
         /// <typeparam name="T"></typeparam>
         /// <param name="session"></param>
         /// <param name="key"></param>
         /// <returns></returns>
         public static T Get<T>(this ISession session, string key)
         {
             var t = default(T);
             if (string.IsNullOrWhiteSpace(key)) { return t; }
 
             if (session.TryGetValue(key, out byte[] val))
             {
                 var strVal = Encoding.UTF8.GetString(val);
                 t = JsonConvert.DeserializeObject<T>(strVal);
             }
             return t;
         }
 
         #endregion
     }

public class MoUser
    {
        public string UserName { get; set; }

        public string Password { get; set; }
    }

 #region  AspnetCore中使用Session

        public IActionResult About()
        {
            MoUser user = new MoUser();

            user.UserName = "你好";
            user.Password = "hello";

            HttpContext.Session.Set<MoUser>("nihao", user);

            return View();
        }
        public IActionResult Contact()
        {
            var user = HttpContext.Session.Get<MoUser>("nihao");
            ViewData["Message"] = user == null ? "Session获取为空" : $"昵称：{user.UserName}，密码：{user.Password}";

            return View();
        }
        #endregion