如何刷新/重新初始化CefSharp

Question

我在我的wpf应用程序中使用CefSharp Offscreen生成网站截图。它运行良好，但我需要检查页面上是否存在某些证书错误，并且应该在应用程序运行时配置它。 我添加了复选框：＆＃34;忽略证书错误＆＃34;来形成。然后我为ChrominiumWebBrowser IRequestHandler实现了MyRequestHandler。

private class MyRequestHandler : IRequestHandler
        {
            public event EventHandler<LoadErrorEventArgs> CertificateError;

            public bool IgnoreCertErrors { get; set; }

            public bool OnBeforeBrowse(IWebBrowser browser, IRequest request, bool isRedirect, bool isMainFrame)
            {
                return false;
            }

            public bool OnCertificateError(IWebBrowser browser, CefErrorCode errorCode, string requestUrl)
            {
                if (IgnoreCertErrors)
                {
                    return true;
                }    
                var handler = CertificateError;
                if (handler != null)
                {
                    handler(browser, new LoadErrorEventArgs(requestUrl, errorCode, Resources.InvalidCert));
                }    
                return false;
            }

            public void OnPluginCrashed(IWebBrowser browser, string pluginPath)
            {
            }

            public CefReturnValue OnBeforeResourceLoad(IWebBrowser browser, IRequest request, bool isMainFrame)
            {
                return CefReturnValue.Continue;
            }

            public bool GetAuthCredentials(IWebBrowser browser, bool isProxy, string host, int port, string realm, string scheme, ref string username, ref string password)
            {
                return true;
            }

            public bool OnBeforePluginLoad(IWebBrowser browser, string url, string policyUrl, WebPluginInfo info)
            {
                return false;
            }

            public void OnRenderProcessTerminated(IWebBrowser browser, CefTerminationStatus status)
            {
            }
        }

浏览器初始化：

browser = new ChromiumWebBrowser();
browser.LoadError += BrowserLoadError;
requestHandler = new MyRequestHandler() { IgnoreCertErrors = ignoreCertErrors };
requestHandler.CertificateError += BrowserLoadError;
browser.RequestHandler = requestHandler;

如果我使用IgnoreCertErrors = true启动应用程序，则可以正常运行并忽略证书错误。

如果我从IgnoreCertErrors = false开始，它也可以正常运行并引发CertificateError。

问题是我在应用程序运行时尝试更改IgnoreCertErrors。当我用false启动app然后从false切换 - ＆gt;确实没关系，但是当我尝试将其从true更改为false时，OnCertificateError方法没有被提升，因此我没有机会检查我的参数。

有缓存还是什么？也许整个我的方法都错了？ 有没有可能重新初始化CefSharp？

更好的例子： XAML：

<Window x:Class="ceftest.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525" Closed="Window_Closed">
    <Grid>
        <StackPanel>
            <Button Grid.Column="1" Click="Button_Click">Generate Screenshot</Button>
            <CheckBox Checked="CheckBox_Checked" Unchecked="CheckBox_Unchecked">Ignore cert errors</CheckBox>
        </StackPanel>
    </Grid>
</Window>

代码隐藏：

public partial class MainWindow : Window
    {
        ChromiumWebBrowser browser;
        bool ignoreCertErrors = false;            
        string url = ""; // some page with invalid certificate

        public MainWindow()
        {
            Cef.Initialize(new CefSettings());
            InitializeComponent();
        }

        private void Button_Click(object sender, System.Windows.RoutedEventArgs e)
        {
            if (browser != null  && browser.IsBrowserInitialized)
            {
                browser.Dispose();
            }    
            browser = new ChromiumWebBrowser();
            browser.LoadError += BrowserLoadError;
            var requestHandler = new RequestHandler() { IgnoreCertErrors = ignoreCertErrors };
            requestHandler.CertificateError += BrowserLoadError;
            browser.RequestHandler = requestHandler;    
            System.Threading.Thread.Sleep(100);
            browser.Size = new System.Drawing.Size(1000, 700);
            browser.NewScreenshot += ScreenshotGenerated;    
            browser.Load(url);
        }

        private void ScreenshotGenerated(object sender, System.EventArgs e)
        {
            // I get here screenshot from browser.ScreenshotAsync and put it into Image control
        }

        private void BrowserLoadError(object sender, LoadErrorEventArgs e)
        {
            MessageBox.Show(e.ErrorCode + " " + e.ErrorText);
        }

        private void CheckBox_Checked(object sender, System.Windows.RoutedEventArgs e)
        {
            ignoreCertErrors = true;
        }

        private void CheckBox_Unchecked(object sender, System.Windows.RoutedEventArgs e)
        {
            ignoreCertErrors = false;
        }

        private void Window_Closed(object sender, EventArgs e)
        {
            Cef.Shutdown();
        }
    }

    class RequestHandler : IRequestHandler
    {
        public event EventHandler<LoadErrorEventArgs> CertificateError;

        public bool IgnoreCertErrors { get; set; }

        public bool GetAuthCredentials(IWebBrowser browser, bool isProxy, string host, int port, string realm, string scheme, ref string username, ref string password)
        {
            return true;
        }

        public bool OnBeforeBrowse(IWebBrowser browser, IRequest request, bool isRedirect, bool isMainFrame)
        {
            return false;
        }

        public bool OnBeforePluginLoad(IWebBrowser browser, string url, string policyUrl, WebPluginInfo info)
        {
            return false;
        }

        public CefReturnValue OnBeforeResourceLoad(IWebBrowser browser, IRequest request, bool isMainFrame)
        {
            return CefReturnValue.Continue;
        }

        public bool OnCertificateError(IWebBrowser browser, CefErrorCode errorCode, string requestUrl)
        {
            if (IgnoreCertErrors)
            {
                return true;
            }

            var handler = CertificateError;
            if (handler != null)
            {
                handler(browser, new LoadErrorEventArgs(requestUrl, errorCode, "certificate error"));
            }

            return false;
        }

        public void OnPluginCrashed(IWebBrowser browser, string pluginPath)
        {
        }

        public void OnRenderProcessTerminated(IWebBrowser browser, CefTerminationStatus status)
        {
        }
    }

CefSharp Offscreen版本41.0.1.0