问C# -使用CefSharp Chromium浏览器打印成PDF格式并适合页面

EN

using (var browser = new ChromiumWebBrowser(url, browserSettings))
{        
    if (zoomLevel > 0)
    {
        browser.FrameLoadStart += (s, argsi) =>
        {
            var b = (ChromiumWebBrowser)s;
            if (argsi.Frame.IsMain)
            {
                b.SetZoomLevel(zoomLevel);
            }
        };
    }

    await browser.WaitForInitialLoadAsync();

    var contentSize = await browser.GetContentSizeAsync();

    var viewport = new Viewport
    {
        Height = contentSize.Height,
        Width = contentSize.Width,
        Scale = 1.0
    };

    var printSettings = new PdfPrintSettings();
    printSettings.PageWidth = 80000;   // 80mm
    printSettings.PageHeight = 200000; // 200mm
    printSettings.BackgroundsEnabled = true;

    await browser.PrintToPdfAsync("D:\\chromium_pdf.pdf", printSettings);
}