如何向SignalR for NET Core2.2上的所有客户端发送新数据/更新数据

using Microsoft.AspNetCore.SignalR;

public class MyHub : Hub
{
    public async Task SendMessage(string message)
    {
        // 处理接收到的消息
        // 可以在这里对消息进行处理，然后将处理结果发送给所有客户端
        await Clients.All.SendAsync("ReceiveMessage", message);
    }
}

using Microsoft.AspNetCore.Builder;
using Microsoft.Extensions.DependencyInjection;

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

    public void Configure(IApplicationBuilder app)
    {
        app.UseRouting();

        app.UseEndpoints(endpoints =>
        {
            endpoints.MapHub<MyHub>("/myhub");
        });
    }
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="/path/to/signalr.js"></script>

<script>
    var connection = new signalR.HubConnectionBuilder().withUrl("/myhub").build();

    connection.on("ReceiveMessage", function (message) {
        // 处理接收到的消息
        console.log(message);
    });

    connection.start().then(function () {
        // 连接成功后的操作
    }).catch(function (error) {
        // 连接失败后的操作
        console.error(error);
    });
</script>

public class MyController : Controller
{
    private readonly IHubContext<MyHub> _hubContext;

    public MyController(IHubContext<MyHub> hubContext)
    {
        _hubContext = hubContext;
    }

    public async Task<IActionResult> SendData(string data)
    {
        // 处理数据
        // 可以在这里对数据进行处理，然后将处理结果发送给所有客户端
        await _hubContext.Clients.All.SendAsync("ReceiveMessage", data);

        return Ok();
    }
}