使用 CefSharp 中的“ProgressBar”页面加载和更新进行可视化

问：

使用页面加载和更新进行可视化。
我试着去做，但没有任何效果。ProgressBarCefSharp

在方法中设置类
中的断点：DownloadHandlerSefSharp.cs

• CanDownload;
• OnBeforeDownload;
• OnDownloadUpdated.

但是在调试时，那里没有任何反应。

frmProgressBar.cs

using CefSharp;
using CefSharp.WinForms;

namespace CefSharpWinFormQuestion.ProgressBarQS.f01Create
{
    public partial class frmProgressBar : Form
    {        
        public frmProgressBar()
        {
            InitializeComponent();
            InitializeChronium();

            textBox1.Text = @"https://github.com/";
        }

        public void InitializeChronium()
        {
            Cef.Initialize(new CefSettings());
            chromiumWebBrowser1.DownloadHandler = new DownloadHandlerSefSharp(progressBar1);
        }

        private void frmProgressBar_FormClosing(object sender, FormClosingEventArgs e)
        {
            Cef.Shutdown();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            string url = textBox1.Text;

            chromiumWebBrowser1.LoadUrlAsync(url);
        }
    }
} 

下载处理程序SefSharp.cs

using System.Windows.Forms;
using CefSharp;


namespace CefSharpWinFormQuestion.ProgressBarQS.f01Create
{
    public class DownloadHandlerSefSharp : IDownloadHandler
    {
        private ProgressBar _bar;
        

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

        public bool CanDownload(IWebBrowser chromiumWebBrowser, IBrowser browser, string url, string requestMethod)
        {
             throw new NotImplementedException();
        }

        void IDownloadHandler.OnBeforeDownload(IWebBrowser chromiumWebBrowser, IBrowser browser, DownloadItem downloadItem, IBeforeDownloadCallback callback)
        {
            // throw new NotImplementedException();
        }

        void IDownloadHandler.OnDownloadUpdated(IWebBrowser chromiumWebBrowser, IBrowser browser, DownloadItem downloadItem, IDownloadItemCallback callback)
        {
            // _bar.dis

            _bar.Invoke(new Action(() => {
                Debug.Print("{0}/{1} bytes", downloadItem.ReceivedBytes, downloadItem.TotalBytes);

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

更新-1

frmProgressBar.cs

public partial class frmProgressBar : Form
    {    

        public frmProgressBar()
        {
            InitializeComponent();
            InitializeChronium();

            textBox1.Text = @"https://github.com/";
        }

        public void InitializeChronium()
        {
            Cef.Initialize(new CefSettings());
            chromiumWebBrowser1.DisplayHandler = new DownloadHandlerSefSharp(progressBar1);
        }
      

        private void frmProgressBar_FormClosing(object sender, FormClosingEventArgs e)
        {
            Cef.Shutdown();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            string url = textBox1.Text;

            chromiumWebBrowser1.LoadUrlAsync(url);
        }
    }

下载处理程序SefSharp.cs

  public class DownloadHandlerSefSharp : DisplayHandler
    {
        private ProgressBar _bar;


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

        protected override void OnLoadingProgressChange(
                    IWebBrowser chromiumWebBrowser, 
                    IBrowser browser,
                    double progress)
        {
            _bar.Invoke(new Action(() => {                               

                _bar.Value = (int)progress;
            }));
        }
    }