SignalR

创建一个空web

1.添加依赖

        public void ConfigureServices(IServiceCollection services)
        {
            services.AddSignalR();
        }

2.路由设置

           app.UseRouting();
            app.UseEndpoints(endpoints =>
            {
                endpoints.MapHub<ChatHub>("/chathub");
            });

3.创建Hub

客户端调用后返回给客户端 

    public class ChatHub : Hub
    {
        public Task SendMessage(string user, string message)
        {
            //使用将消息发送到所有连接的客户端
            return Clients.All.SendAsync("ReceiveMessage", user, message);

            //使用将消息发回给调用方
            //return Clients.Caller.SendAsync("ReceiveMessage", message);

            //向组中的所有客户端发送一条消息
            //return Clients.Group("SignalR Users").SendAsync("ReceiveMessage", message);
        }
    }