问删除WebView2 PDF预览中的按钮

EN

using System.Threading.Tasks;
using System.Windows.Forms;

namespace PdfViewer
{
    public partial class Form1 : Form
    {
        public Task App { get; set; }

        public Form1()
        {
            InitializeComponent();

            InitializeWebView();
        }

        private void InitializeWebView()
        {
            App = webView21.EnsureCoreWebView2Async(null);
        }

        private async void Form1_Load(object sender, EventArgs e)
        {
            await App;
            webView21.CoreWebView2.Settings.AreDefaultContextMenusEnabled = false;
            if (webView21 != null && webView21.CoreWebView2 != null)
            {
                webView21.CoreWebView2.Navigate(@"C:\sample.pdf");
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            webView21.CoreWebView2.Settings.AreDefaultContextMenusEnabled = false;
            if (webView21 != null && webView21.CoreWebView2 != null)
            {
                webView21.CoreWebView2.Navigate(addressBar.Text);
            }
        }
    }
}