public class KingkingLogger : ILogger
{
    private readonly string cateName;
    public KingkingLogger(string cate)
    {
        cateName = cate;
    }
    public IDisposable? BeginScope<TState>(TState state) where TState : notnull
    {
        return default;
    }
    public bool IsEnabled(LogLevel logLevel)
    {
        return logLevel != LogLevel.None;
    }
    public void Log<TState>(LogLevel logLevel, EventId eventId, TState state, Exception? exception, Func<TState, Exception?, string> formatter)
    {
        if(IsEnabled(logLevel) == false)
        {
            return;
        }
        // 獲取格式化后的文本
        string fstr = formatter(state, exception);
        // 顯示消息類型
        string head = logLevel switch
        {
            LogLevel.Information => "消息",
            LogLevel.Warning => "警告",
            LogLevel.Error => "錯誤",
            _ => "未知"
        };
        // 加個日期
        string currdate = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss");
        // 連接字符串
        fstr = $"[{head}:{cateName}][{currdate}]{fstr}";
        // 觸發(fā)事件
        TransferLog?.Invoke(fstr);
    }
    // 靜態(tài)屬性
    public static Action<string>? TransferLog {  get; set; }
}

public class KingkingLoggerProvider : ILoggerProvider
{
    public ILogger CreateLogger(string categoryName)
    {
        return new KingkingLogger(categoryName);
    }
    public void Dispose()
    {
        return;
    }
}

public static class CustLoggerExtensions
{
    public static ILoggingBuilder AddKingkingLogger(this ILoggingBuilder builder)
    {
        builder.Services.AddSingleton<ILoggerProvider, KingkingLoggerProvider>();
        return builder;
    }
}

var builder = WebApplication.CreateBuilder(args);
// 配置日志
builder.Services.AddLogging(o =>
{
    // 清空所有日志提供者
    o.ClearProviders();
    // 添加控制臺日志輸出
    o.AddConsole();
    // 添加咱們自己寫的日志記錄器
    o.AddKingkingLogger();
});

public class MyHub : Hub
{
    public MyHub() {
        // 這里關(guān)聯(lián)的就是日志記錄類中的靜態(tài)委托
        KingkingLogger.TransferLog = KingkingLogger_TransferLog;
    }
    private void KingkingLogger_TransferLog(string obj)
    {
        // 向所有客戶端發(fā)日志
        Clients.All.SendAsync("onLogged", obj);
    }
    protected override void Dispose(bool disposing)
    {
        if(disposing)
        {
            // 實(shí)例釋放時移除關(guān)聯(lián)
            KingkingLogger.TransferLog = null;
        }
        base.Dispose(disposing);
    }
}

var builder = WebApplication.CreateBuilder(args);
……
builder.Services.AddSignalR();
var app = builder.Build();

var builder = WebApplication.CreateBuilder(args);
……
var app = builder.Build();
……
// 記得這個
app.MapHub<MyHub>("/hub");
app.Run();

var builder = WebApplication.CreateBuilder(args);
……
// 把Hub注冊為單實(shí)例
builder.Services.AddSingleton<MyHub>();
builder.Services.AddSignalR();
var app = builder.Build();

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <OutputType>WinExe</OutputType>
    <TargetFramework>net8.0-windows</TargetFramework>
    <Nullable>enable</Nullable>
    <UseWindowsForms>true</UseWindowsForms>
    <ImplicitUsings>enable</ImplicitUsings>
  </PropertyGroup>
  <ItemGroup>
    <PackageReference Include="Microsoft.AspNetCore.SignalR.Client" Version="8.0.0" />
  </ItemGroup>
</Project>

using Microsoft.AspNetCore.SignalR.Client;
namespace TestClient;
public partial class Form1 : Form
{
    // 連接對象
    HubConnection hubConn;
    public Form1()
    {
        InitializeComponent();
        // 初始化連接
        var connBuilder = new HubConnectionBuilder()
            .WithUrl("http://localhost:6225/hub")
            .WithAutomaticReconnect();
        hubConn = connBuilder.Build();
        // 關(guān)聯(lián)方法
        hubConn.On<string>("onLogged", OnLogRecv);
    }
    private void OnLogRecv(string msg)
    {
        // 服務(wù)器回調(diào)，顯示收到的日志
        textBox1.Invoke(() =>
        {
            textBox1.AppendText(msg + Environment.NewLine);
        });
    }
    private async void btnConn_Click(object sender, EventArgs e)
    {
        try
        {
            await hubConn.StartAsync();
            lbMessage.Text = "已建立連接";
        }
        catch(Exception ex) {
            lbMessage.Text = ex.Message;
        }
    }
    private async void btnDisconn_Click(object sender, EventArgs e)
    {
        if(hubConn.State == HubConnectionState.Connected)
        {
            await hubConn.StopAsync();
            lbMessage.Text = "已斷開連接";
        }
    }
}

/*---------------- 服務(wù)器端 ------------------*/
private void KingkingLogger_TransferLog(string obj)
{
    // 向所有客戶端發(fā)日志
    Clients.All.SendAsync("onLogged", obj);
}

/*--------------------- 客戶端 -------------------*/
hubConn.On<string>("onLogged", OnLogRecv);

app.MapGet("/", (ILoggerFactory logFact) =>
{
    ILogger logger = logFact.CreateLogger("MINI Main");
    logger.LogInformation("歡迎來到圓環(huán)世界");
    return "Hello Guy";
});
app.MapGet("/start", (ILoggerFactory logFact) =>
{
    ILogger logger = logFact.CreateLogger("MINI Go Go Go");
    logger.LogWarning("游戲開始了，你必須先和QB簽訂契約");
    return "圓神啟動";
});
app.MapGet("/shot", (ILoggerFactory loggerFact) =>
{
    ILogger logger = loggerFact.CreateLogger("MINI Wind");
    logger.LogInformation("干得好，三發(fā)入魂");
    return "第一局完勝";
});