.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");

}

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