CefSharp ProgressBar for indicating download progress

问题

I am making a web browser based on CefSharp. When I try to download a file from the web, it prompts me to save the file, and when I press Save, it downloads the file without indicating any progress percentage. I want to add a ProgressBar to show download progress. How can I do this?

回答1:

You can use an IDownloadHandler for that.

Suppose you have a browser control named Browser and a ProgressBar named Barin your XAML, you can do this in your code behind:

Browser.DownloadHandler = new MyDownloadHandler(Bar);

Here's the code for the MyDownloadHandler:

public class MyDownloadHandler : IDownloadHandler {
    private ProgressBar _bar;

    public MyDownloadHandler(ProgressBar bar) {
        _bar = bar;
    }

    public void OnBeforeDownload(IBrowser browser, DownloadItem downloadItem, IBeforeDownloadCallback callback) {

    }

    public void OnDownloadUpdated(IBrowser browser, DownloadItem downloadItem, IDownloadItemCallback callback) {
        _bar.Dispatcher.Invoke(new Action(() => {
            Debug.Print("{0}/{1} bytes", downloadItem.ReceivedBytes, downloadItem.TotalBytes);

            _bar.Maximum = downloadItem.TotalBytes;
            _bar.Value = downloadItem.ReceivedBytes;
        }));
    }
}

来源：https://stackoverflow.com/questions/41106707/cefsharp-progressbar-for-indicating-download-progress