linqpad 代码 

// 手册 https://playwright.dev/dotnet/docs/actionability

async System.Threading.Tasks.Task Main(string[] args)
{
    var app = CreateApp(args);
    var logger = GetLogger(app);

    // 安装一下
    // Microsoft.Playwright.Program.Main(new string[] { "install" }); 

    using var playwright = await Microsoft.Playwright.Playwright.CreateAsync();

    var proxy = new Microsoft.Playwright.Proxy() { Server = "http://192.168.0.90:17890" };
    await using var browser = await playwright.Chromium.LaunchAsync(new() { Headless = false, Proxy = proxy });

    Microsoft.Playwright.BrowserNewContextOptions options = new Microsoft.Playwright.BrowserNewContextOptions();

    var page = await browser.NewPageAsync();

    var icons = new List<string>();
    var set = new HashSet<string>(); // 用来比较有没有新的元素出现

    try
    {
        await page.GotoAsync("https://pictogrammers.com/library/mdi/");

        // await page.ScreenshotAsync(new() { Path = "screenshot.png" });

        await page.WaitForSelectorAsync(@"//div[@class='virtuoso-grid-item']");

        var trytimes = 0;

        while (true)
        {
            var firstPage = !set.Any();         

            var list = new List<string>();
            var elements = await page.QuerySelectorAllAsync(@"//div[@class='virtuoso-grid-item']/a");

            var button = await page.QuerySelectorAsync(@"//button[.='Do Not Track']");
            if (button != null)
            {
                await button.ClickAsync();
            }

            foreach (var element in elements)
            {
                var innerHtml = await element.InnerHTMLAsync();
                HtmlAgilityPack.HtmlDocument htmlDocument = new HtmlAgilityPack.HtmlDocument();
                htmlDocument.LoadHtml(innerHtml);

                var xpathNavigator = htmlDocument.CreateNavigator();
                var titleNode = xpathNavigator.SelectSingleNode(".//title");

                var title = titleNode?.Value;
                if (string.IsNullOrWhiteSpace(title))
                {
                    continue;
                }

                list.Add(title);
            }

            if (!firstPage && list.TrueForAll(it => set.Contains(it)))
            {
                trytimes++;
                if (trytimes < 3) {

                    logger.LogInformation("没有新元素了, 重试");
                    await System.Threading.Tasks.Task.Delay(TimeSpan.FromSeconds(1));
                    continue; // 如果没有新元素出现，可能太快了，再试几次
                }

                logger.LogInformation("没有新元素了, 退出");
                break;
            }

            trytimes = 0;
            set.Clear();
            list.ForEach(it => set.Add(it));
            icons.AddRange(list);

            var lastElement = elements.LastOrDefault();
            if (lastElement == null)
            {
                logger.LogInformation("没有元素了");
                break;
            }

            await lastElement.FocusAsync();

            await System.Threading.Tasks.Task.Delay(TimeSpan.FromSeconds(0.1));
        }

        // 保存一下
        logger.LogInformation("保存文件");
        var desktop = System.Environment.GetFolderPath(Environment.SpecialFolder.Desktop);
        var path = Path.Combine(desktop, "icons.txt");
        await File.WriteAllLinesAsync(path, icons);

        logger.LogInformation("处理完成");
    }
    finally
    {
        await page.CloseAsync();
    }
}

// 返回日志
Microsoft.Extensions.Logging.ILogger GetLogger(Microsoft.Extensions.Hosting.IHost app)
{
    var logger = app.Services.GetRequiredService<Microsoft.Extensions.Logging.ILogger<UserQuery>>();
    return logger;
}

// 创建应用
Microsoft.Extensions.Hosting.IHost CreateApp(string[] args)
{
    Serilog.Log.Logger = new Serilog.LoggerConfiguration().WriteTo.LINQPad(outputTemplate: "[{Timestamp:HH:mm:ss} {Level:u3}] {Message}{NewLine}{Exception}").CreateLogger();

    Microsoft.Extensions.Hosting.HostApplicationBuilder builder = Microsoft.Extensions.Hosting.Host.CreateApplicationBuilder(args);
    builder.Services.AddLogging(it =>
    {
        it.ClearProviders();
        it.AddSerilog(dispose: true);
    });

    var app = builder.Build();

    return app;
}