Jquery 如何从FileSystemWatcher生成引导警报

我有一个Asp.NETRazor页面，它使用FileSystemWatcher在将新文件添加到特定目录时生成事件。它工作正常，我能够生成控制台消息

public void OnGet()
    {
        var directoryToWatch = @"c:\\psdata\\in";

        if (!Directory.Exists(directoryToWatch))
        {
            Console.WriteLine($"ERROR: {directoryToWatch} does not exist");
        }
        else
        {
            var inputFileWatcher = new FileSystemWatcher(directoryToWatch);
            inputFileWatcher.IncludeSubdirectories = false;

            inputFileWatcher.Created += FileCreated;
            inputFileWatcher.Error += WatcherError;

            inputFileWatcher.EnableRaisingEvents = true;
        }
    }

    private static void FileCreated(object sender, FileSystemEventArgs e)
    {
        //Instead of writing to console, how to raise the #btnSubmit event that will cause the bootstrap alert to be generated?
        Console.WriteLine($"* File created: {e.Name} - type: {e.ChangeType}");
    }

但是，我不知道如何生成一条引导警报消息来宣布文件已创建的事实。以下是我的标记：

$（文档）.ready（函数（）{
$（'#btnsupmit'）。单击（函数（）{
$（'myAlert'）。显示（'fade'）；
setTimeout（函数（）{
$（'myAlert'）。隐藏（'fade'）；
}, 2500);
});
$（'#linkClose'）。单击（函数（）{
$（'myAlert'）。隐藏（'fade'）；
});
});

数据处理机
提交




警惕一个文件刚刚添加到psData目录
尝试使用signalR生成从服务器到客户端的引导警报

SignalR服务器库包含在
Microsoft.AspNetCore.App
metapackage中。不会自动将包含在项目中。对于本教程，将使用库管理器（LibMan）从UNPGG获取客户端库。unpkg是一个内容交付网络（CDN）），可以交付在Node.js包管理器npm中找到的任何内容

创建一个信号集线器，作为处理客户机-服务器通信的高级管道

public class NotificationHub:Hub
{  
}

配置信号器

public void ConfigureServices(IServiceCollection services)
    {
        services.Configure<CookiePolicyOptions>(options =>
        {
            // This lambda determines whether user consent for non-essential cookies is needed for a given request.
            options.CheckConsentNeeded = context => true;
            options.MinimumSameSitePolicy = SameSiteMode.None;
        });


        services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);

        services.AddSignalR();
    }

    // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
    public void Configure(IApplicationBuilder app, IHostingEnvironment env)
    {
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }
        else
        {
            app.UseExceptionHandler("/Error");
            app.UseHsts();
        }

        app.UseHttpsRedirection();
        app.UseStaticFiles();
        app.UseCookiePolicy();
        app.UseSignalR(routes =>
        {
            routes.MapHub<NotificationHub>("/notificationHub");
        });
        app.UseMvc();
    }

参考：及

@section Scripts {
<script src="~/lib/signalr/dist/browser/signalr.js"></script>
<script type="text/javascript">

    var connection = new signalR.HubConnectionBuilder()
        .withUrl("/notificationHub")
        .build();
    connection.on("Notify", function (message) {
        appendMessage(message)
    });
    connection.start();

    function appendMessage(content) {
        alert(content);
    }

</script>
}

private readonly IHubContext<NotificationHub> _hubContext;
public CreateFileModel(IHubContext<NotificationHub> hubContext)
{
        _hubContext = hubContext;
}

 private  void FileCreated(object sender, FileSystemEventArgs e)
    {
        _hubContext.Clients.All.SendAsync("Notify", $"A file has just been added to the psData directory");

        //Console.WriteLine($"* File created: {e.Name} - type: {e.ChangeType}");
    }