摘要： https://blog.csdn.net/u011127019/article/details/90812008 一、从控制器中获取IHubContext 操作发送消息 此种方式，常用简单 public class HomeController : Controller{ private read 阅读全文

摘要： 问题: InvalidOperationException: Unable to resolve service for type 'WebApplication3.Models.SysUserDB' while attempting to activate 'WebApplication3.Con 阅读全文