using Microsoft.AspNetCore.SignalR;

namespace DemoSignalR.Server.Chat
{
    public class ChatHub : Hub
    {
        #region 連接和斷開(kāi)連接

        public override async Task OnConnectedAsync()
        {
            var connId = Context.ConnectionId;
            Console.WriteLine($"{connId} 已連接");
            await base.OnConnectedAsync();
        }

        public void StartNotify(string type)
        {
            if (type == "1")
            {

            }
            else if (type == "2")
            {

            };

        }

        public override async Task OnDisconnectedAsync(Exception ex)
        {
            //如果斷開(kāi)連接
            var connId = Context.ConnectionId;
            Console.WriteLine($"{connId} 已斷開(kāi)");
            await base.OnDisconnectedAsync(ex);
        }

        #endregion
    }
}

using DemoSignalR.Server.Chat;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.SignalR;

namespace DemoSignalR.Server.Controllers
{
    [ApiController]
    [Route("[controller]")]
    public class TestWebApiController : ControllerBase
    {


        private readonly ILogger<TestWebApiController> _logger;

        private IHubContext<ChatHub> _context;

        public TestWebApiController(ILogger<TestWebApiController> logger, IHubContext<ChatHub> context)
        {
            _logger = logger;
            _context = context;
        }

        [HttpGet]
        public void GetTestA(string Name)
        {
            string info = $"當(dāng)前接收到的信息為：{Name},{DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss.fff")}";
            _context.Clients.All.SendAsync("", info);
        }


    }
}

using Microsoft.AspNetCore.SignalR;
using System.Timers;

namespace DemoSignalR.Server.Chat
{
    public class TestChatInfo
    {
        private IHubContext<ChatHub> _context;

        private System.Timers.Timer _timer;

        private readonly static object locker = new object();//鎖對(duì)象

        public static TestChatInfo instance;//當(dāng)前實(shí)例

        private readonly ILogger _logger;

        private int _index = 0;

        private TestChatInfo(IHubContext<ChatHub> _context, ILogger _logger)
        {
            this._context = _context;
            this._logger = _logger;
            //定義定時(shí)器
            _timer = new System.Timers.Timer(100);
            _timer.AutoReset = true;
            _timer.Enabled = true;
            _timer.Elapsed += Timer_Elapsed;
            _timer.Start();
        }

        private void Timer_Elapsed(object? sender, ElapsedEventArgs e)
        {
            //業(yè)務(wù)邏輯判斷
            var obj = new TestValue();
            obj.Index = this._index;
            obj.Value = DateTime.Now.Millisecond % 100;
            _context.Clients.All.SendAsync("RefreshInfos", obj);
            this._index++;
        }

        /// <summary>
        /// 注冊(cè)，即初始化單例實(shí)例
        /// </summary>
        /// <param name="context"></param>
        /// <param name="reviewTaskService"></param>
        /// <param name="sysParamService"></param>
        public static void Register(IHubContext<ChatHub> context, ILogger logger)
        {
            lock (locker)
            {
                if (instance == null)
                {
                    lock (locker)
                    {
                        instance = new TestChatInfo(context, logger);
                    }
                }
            }
        }

    }

    public class TestValue
    {
        private int index;
        public int Index { get { return index; } set { index = value; } }

        private float value;
        public float Value { get { return value; } set { this.value = value; } }
    }
}

using DemoSignalR.Server.Chat;
using Microsoft.AspNetCore.SignalR;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.

builder.Services.AddControllers();
// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();
//1.添加SignalR服務(wù)
builder.Services.AddSignalR();
builder.Services.AddLogging(logging => logging.AddConsole());

var app = builder.Build();

// Configure the HTTP request pipeline.
if (app.Environment.IsDevelopment())
{
    app.UseSwagger();
    app.UseSwaggerUI();
}
app.UseRouting();
app.UseHttpsRedirection();

app.UseAuthorization();


//在Use中注冊(cè)單例實(shí)例
app.Use(async (context, next) =>
{
    var hubContext = context.RequestServices.GetRequiredService<IHubContext<ChatHub>>();
    //var logger = context.RequestServices.GetRequiredService<ILogger>();
    TestChatInfo.Register(hubContext, null);//調(diào)用靜態(tài)方法注冊(cè)
    if (next != null)
    {
        await next.Invoke();
    }
});

app.MapControllers();

//2.映射路由
app.UseEndpoints(endpoints => {
    endpoints.MapHub<ChatHub>("/chat");
});

app.Run();

using Microsoft.AspNetCore.SignalR.Client;
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace DemoSignalR.Client
{
    internal class SignalRClient
    {
        private readonly HubConnection hubConnection;

        public HubConnection HubConnection
        {
            get { return hubConnection; }
        }

        public SignalRClient()
        {
            var server = ConfigurationManager.AppSettings["Server"].ToString();
            hubConnection = new HubConnectionBuilder().WithUrl($"{server}/chat").WithAutomaticReconnect().Build();
            hubConnection.KeepAliveInterval = TimeSpan.FromSeconds(5);
        }

        public virtual void Listen()
        {

        }

        public async void Start()
        {
            try
            {
                await hubConnection.StartAsync();

            }
            catch (Exception e)
            {

            }
        }
    }
}

using Microsoft.AspNetCore.SignalR.Client;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace DemoSignalR.Client
{
    internal class TestSignalRClient : SignalRClient
    {
        public Action<object> RefreshInfos;

        public Action<string> Reconnected;

        public TestSignalRClient() : base()
        {
        }

        public override void Listen()
        {
            HubConnection.On<object>("RefreshInfos", (obj) =>
            {
                //
                if (obj != null)
                {
                    Console.WriteLine("收到數(shù)據(jù)");
                    //發(fā)送消息
                    if (RefreshInfos != null)
                    {
                        RefreshInfos(obj);
                    }
                }
            });
            HubConnection.Reconnected += HubConnection_Reconnected;
        }

        private Task HubConnection_Reconnected(string arg)
        {
            return Task.Run(() =>
            {
                if (Reconnected != null)
                {
                    Reconnected(arg);
                }
            });
        }

        public virtual void StartNotify(string condition)
        {
            HubConnection.SendAsync("StartNotify", condition);
            Console.WriteLine($"開(kāi)始通過(guò)知{condition}");
        }
    }
}