InvalidOperationException: Session has not been configured for this application or request.

asp.net3.1 core使用Session报错InvalidOperationException: Session has not been configured for this application or request.

解决方案:
找到StartUp类
第一步：在ConfigureServices方法中添加一个services.AddSession();

第二步使用Session
在Configure方法中添加 app.UseSession();方法