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

.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Sessionapp.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");  }

 

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