一、Core3.1添加Session后报错：Some services are not able to be constructed
在使用“services.AddSession();”和“app.UseSession();”之后，启动项目报错：
System.AggregateException:“Some services are not able to be constructed (Error while validating the service descriptor 'ServiceType: Microsoft.AspNetCore.Session.ISessionStore Lifetime: Transient ImplementationType: Microsoft.AspNetCore.Session.DistributedSessionStore': Unable to resolve service for type 'Microsoft.Extensions.Caching.Distributed.IDistributedCache' while attempting to activate 'Microsoft.AspNetCore.Session.DistributedSessionStore'.)”
解决办法：
新增：services.AddDistributedMemoryCache();
二、Core3.1添加Session后报错：Session has not been configured for this application or request.
明明已经添加了“services.AddSession();”和“app.UseSession();”，而且启动也不报错，
但是使用的时候报错：Session has not been configured for this application or request.
这个是因为中间件顺序加载有误
app.UseSession();需要放在“app.UseRouting();”和“app.UseEndpoints”中间
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标签：UseSession,app,中介,services,管理软件,Session,报错,房产,Microsoft From： https://www.cnblogs.com/randytech/p/16718007.html