.net core 3.0/3.1session持久化redis,session id为空

  .net core 3.1中将session持久化到redis，从core1.0开始，2.0/2.1,3.0/3.1每次搭建开发框架都因为session的问题搞的头大，次次踩坑，花了半天时间再次捋了一遍，发出来如果大家有跟我一样，希望能帮到你，另外如果有帮到你，记得点赞哈！！！

1.需引入的库文件

 1.1：Microsoft.AspNetCore.Http.Extensions，因为.net core中的session默认只能存储字节，所以引入该库是为了解决session存储字符串

2.Microsoft.AspNetCore.Session，Microsoft.Extensions.Caching.Redis，针对session扩展

3.StackExchange.Redis为redis驱动

4.Newtonsoft.Json我自己项目常使用的序列化工具，可根据自己的需求使用

项目针对session持久化redis的配置

"SessoinConfig": { // Session配置
    "RedisCacheConfig": {
      "ConnectionString": "ip:端口,ssl=false,password=密码,defaultdatabase=redis库索引",
      "InstanceName": "自定义实例名"
    },
    "SessionTimeOut": 60 //session过期时长，分钟
  }

注入实体类：

    /// <summary>
    /// Session缓存配置
    /// </summary>
    public class SessoinConfig
    {
        /// <summary>
        /// session过期时长，分钟
        /// </summary>
        public int SessionTimeOut { get; set; }

        /// <summary>
        /// 实例库索引
        /// </summary>
        public RedisCacheConfigData RedisCacheConfig { get; set; }
    }

    /// <summary>
    /// Session持久化Redis配置
    /// </summary>
    public class RedisCacheConfigData
    {
        /// <summary>
        /// Redis连接字符串
        /// </summary>
        public string ConnectionString { get; set; }

        /// <summary>
        /// Redis实例名称
        /// </summary>
        public string InstanceName { get; set; }
    }

IServiceCollection扩展

        /// <summary>
        /// Session持久化至Redis
        /// </summary>
        /// <param name="services"></param>
        /// <param name="Configuration"></param>
        public static void UseSession(this IServiceCollection services, SessoinConfig sessoinConfig)
        {
            services.AddSingleton<IDistributedCache>(
                serviceProvider =>
                    new RedisCache(new RedisCacheOptions
                    {
                        Configuration = sessoinConfig.RedisCacheConfig.ConnectionString,
                        InstanceName = sessoinConfig.RedisCacheConfig.InstanceName
                    }));

            // 添加Session并设置过期时长
            services.AddSession(options => { options.IdleTimeout = TimeSpan.FromMinutes(sessoinConfig.SessionTimeOut); });
        }

Startup服务添加容器方法ConfigureServices

 // 读取Session配置文件
 IConfigurationSection sessionCacheSections = Configuration.GetSection("SessoinConfig");
 SessoinConfig sessionCacheConfig = sessionCacheSections.Get<SessoinConfig>();
 services.UseSession(sessionCacheConfig);

Startup运行时方法Configure使用Session

// 使用Session
app.UseSession();

自定义Session扩展

    /// <summary>
    /// Session扩展
    /// </summary>
    public static class SessionExtensions
    {
        /// <summary>
        /// 添加Session
        /// </summary>
        /// <param name="session"></param>
        /// <param name="key"></param>
        /// <param name="value"></param>
        public static void SetObjectAsJson(this ISession session, string key, object value)
        {
            session.SetString(key, JsonConvert.SerializeObject(value));
        }

        /// <summary>
        /// 添加Session
        /// </summary>
        /// <param name="session"></param>
        /// <param name="key"></param>
        /// <param name="value"></param>
        public static void SetObjectAsJson<T>(this ISession session, string key, T value)
        {
            session.SetString(key, JsonConvert.SerializeObject(value));
        }

        /// <summary>
        /// 获取Session
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="session"></param>
        /// <param name="key"></param>
        /// <returns></returns>
        public static T GetObjectFromJson<T>(this ISession session, string key)
        {
            var value = session.GetString(key);
            return value == null ? default(T) : JsonConvert.DeserializeObject<T>(value);
        }

        /// <summary>
        /// 删除Session
        /// </summary>
        /// <param name="session"></param>
        /// <param name="key"></param>
        public static void RemoveSession(this ISession session, string key)
        {
            var value = session.GetString(key);
            if (value != null)
            {
                session.Remove(key);
            }
        }
    }

例如我存储登录验证码

/// <summary>
        /// 用户登录验证码
        /// </summary>
        protected string ValidateCodeData
        {
            get { return HttpContext.Session.GetObjectFromJson<string>(LoginValidateCodeSessionKey); }
            set { HttpContext.Session.SetObjectAsJson<string>(LoginValidateCodeSessionKey, value); }
        }

/// <summary>
        /// 获取验证码
        /// </summary>
        /// <returns></returns>
        public IActionResult ValidateCode()
        {
            System.IO.MemoryStream ms = _logic.LoginValidateCode(out string code, 4);
            ValidateCodeData = code;
            Response.Body.Dispose();
            return File(ms.ToArray(), @"image/png");
        }

 欢迎转载，转载请保留出处，哈哈哈