C# CEFSharp应用程序显示空白屏幕，然后对此作出响应'；一分钟后他就要走了

我一直在开发一个应用程序，它使用CEFSharp（版本83.4.20）加载我公司的VOIP平台（engage.ringcentral.com）。源在Github上

该应用程序已经运行了大约一个月，在投入生产后，我收到了一个奇怪问题的报告。人们看到的是一个空白屏幕，无法与网页交互( )。几分钟后，问题似乎自行解决，他们可以再次与网页互动。我自己还没能重现这个问题

我认为这可能是一个渲染问题。到目前为止，我已尝试在我的应用程序中调整以下内容：

删除下面的行

settings.CefCommandLineArgs.Add("disable-gpu");
settings.CefCommandLineArgs.Add("disable-gpu-shader-disk-cache", "1");

替换为

settings.CefCommandLineArgs.Add("disable-gpu-compositing");

不幸的是，这并没有解决问题，我不确定我缺少了什么

CEF初始化的相关代码位于InitializeChromium方法下的中。见下文

    // 
    // Chrome
    // 
    private CefSharp.WinForms.ChromiumWebBrowser chromeBrowser;
    public ChromiumWebBrowser InitializeChromium(string URL, string Name)
    {
        // Check if already Initialized
        if (Cef.IsInitialized == false)
        {
            CefSettings settings = new CefSettings();
            // Enable Logging if debugging or console window
            if (!this.debug || !this.console)
            {
                settings.LogSeverity = LogSeverity.Disable;
            }
            else
            {
                settings.LogSeverity = LogSeverity.Verbose;
            }
            // Enable Microphone settings
            settings.CefCommandLineArgs.Add("enable-media-stream", "1");
            // Set Custom Browser Paths
            settings.CefCommandLineArgs.Add("disable-gpu-shader-disk-cache", "1");
            // Disable GPU to fix rendering issues on some machines.
            settings.CefCommandLineArgs.Add("disable-gpu");
            // Disable CORS protection (cross site scripting) which the engage.ringcentral.com site doesn't seem to like/respect, disabled as the website doesn't seem to improve with this turned on.
            //settings.CefCommandLineArgs.Add("disable-web-security");
            // Enable session Cookie persistence, disabled as it's unneeded. 
            //settings.PersistSessionCookies = true;
            // Custom Browser paths
            settings.BrowserSubprocessPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, @"Resources\CEFSharp\CefSharp.BrowserSubprocess.exe");
            settings.LocalesDirPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, @"Resources\CEFSharp\locales\");
            settings.ResourcesDirPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, @"Resources\CEFSharp\");
            // Check if Resources folder is writable. If it isn't then write to application data.
            DirectoryInfo di = new DirectoryInfo(Path.Combine(AppDomain.CurrentDomain.BaseDirectory, @"Resources\CEFSharp\"));
            if ((di.Attributes & FileAttributes.ReadOnly) == FileAttributes.ReadOnly)
            {
                settings.RootCachePath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData), @"EngageRC\CEFSharp\cache");
                settings.CachePath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData), @"EngageRC\CEFSharp\cache");
                settings.LogFile = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData), @"EngageRC\CEFSharp\debug.log");
            }
            else
            {
                settings.RootCachePath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, @"Resources\CEFSharp\cache");
                settings.CachePath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, @"Resources\CEFSharp\cache");
                settings.LogFile = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, @"Resources\CEFSharp\debug.log");
            }
            // Initialize cef with the provided settings or add new tab
            Cef.Initialize(settings, performDependencyCheck: true, browserProcessHandler: null);
        }
        // Create a browser component
        chromeBrowser = new ChromiumWebBrowser(URL);
        // Set Name
        chromeBrowser.Name = Name;
        // Adjust size and scaling
        this.chromeBrowser.Dock = DockStyle.Fill;
        this.chromeBrowser.Width = this.Width;
        this.chromeBrowser.Height = this.Height;
        // Add control
        this.Controls.Add(chromeBrowser);
        // Bring to front
        this.chromeBrowser.BringToFront();
        // Set label to Goodbye.
        this.label1.Text = "Goodbye";

        // Return control
        return chromeBrowser;
    }

我无法用我的Google foo找到任何以前的问题，所以这似乎不是其他人看到的应用程序。我还在学习C#的诀窍，所以这100%可能是我自己的错，我做错了什么

我能够从一台遇到该问题的机器上获得详细的日志记录。我主要看到以下错误。完整日志在

[0729/083616.491:错误：paint_controller.cc（646）]PaintController:：FinishCycle（）已完成

任何有助于解决此问题的想法或建议都将不胜感激

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更新：根据@amaitland的有用评论，似乎这种行为可能是由使用线程引起的。在我不应该使用的线程上睡眠

在检查了我的代码之后，看起来我在两个地方都有这个

首先，我调用thread.sleep以等待浏览器的缩放级别与我保存到windows isolatedstorage的值匹配。除非应用程序第一次启动，否则不应运行此操作。我不认为这是个问题，但为了安全起见，我把它贴在这里。（）

根据我所听到的，我应该让通知表单在与主应用程序不同的线程上运行，然后呢？还是我离基地太远了

---

更新： 我能够将通知移动到它自己的线程中。我将关闭这个问题，并将有用户的测试，看看是否空白屏幕仍然存在。

---

再次感谢你的帮助

@amaitland的评论有助于缩小此问题的范围。

考虑在链接中添加相关代码。链接在将来可能会变得无效。已更新，感谢您的提示！你用的是什么版本？你检查日志文件了吗？建议始终启用日志记录。CEFSharp版本83.4.20。不幸的是，我已经为报告问题的用户禁用了日志记录，所以我还没有机会查看这些日志。我试图让他们在启用日志记录的情况下重现这个问题，但这是一种零星的行为。这种行为通常是由于错误地阻塞/休眠了一个不应该执行的线程而导致的。

public void OnLoadingStateChanged(object sender, LoadingStateChangedEventArgs args)
        {
            ChromiumWebBrowser chrome = (ChromiumWebBrowser)sender;
            if (!args.IsLoading) // Loading finished.
            {
                // If first load set zoom level to previous level
                if (firstLoad < 3)
                {
                    try
                    {
                        double zoom = double.Parse(ConfigReader.ReadIsolatedStorage("z"), System.Globalization.CultureInfo.InvariantCulture);
                        while (args.Browser.GetZoomLevelAsync().Result != zoom) { chrome.SetZoomLevel(zoom); Thread.Sleep(50); }
                    }
                    catch { }
                    firstLoad++;
                }
                // These JS and CSS modifications built into EngageRC
                string hotfixJS = "";
                string hotfixCSS = "/* Fix for dropdowns */ ul.dropdown-menu[style=\\\"opacity: 1;\\\"] {display: block !important; } /* End fix for dropdowns */";
                // Inject custom javascript and css code on page load
                chrome.ExecuteScriptAsync(hotfixJS);
                chrome.ExecuteScriptAsync("var engageRCSS = document.getElementById('EngageRCSS'); if (!engageRCSS) { var node = document.createElement('style'); node.setAttribute('id', 'EngageRCSS'); node.innerHTML = \"" + hotfixCSS +"\"; document.body.appendChild(node); }");
                if (File.Exists(Path.Combine(AppDomain.CurrentDomain.BaseDirectory, @"Resources\Custom.js"))) { chrome.ExecuteScriptAsync(System.IO.File.ReadAllText(Path.Combine(AppDomain.CurrentDomain.BaseDirectory, @"Resources\Custom.js"))); }
                if (File.Exists(Path.Combine(AppDomain.CurrentDomain.BaseDirectory, @"Resources\Custom.css"))) { chrome.ExecuteScriptAsync("var customCSS = document.getElementById('customcss'); if (!customCSS) { var node = document.createElement('style'); node.setAttribute('id', 'customcss'); node.innerHTML = \"" + System.IO.File.ReadAllText(Path.Combine(AppDomain.CurrentDomain.BaseDirectory, @"Resources\Custom.css")).Replace("\n", String.Empty).Replace("\r", String.Empty).Replace("\t", String.Empty).Replace("\"", "\\\"") + "\"; document.body.appendChild(node); }"); }
            }
         }

public void displayNotification(string Title = "EngageRC", string Message = "")
            {
                // Display notification for 5 seconds
                Notify notification = MainWindow.notification;
                try
                {
                    if (!IsActive(hWnd)) // Check if application is already active.
                    {
                        string config = ConfigReader.GetConfigValue("NotificationsDisabled").ToLower();
                        if (!(config == "true" || config == "1"))
                        {
                            notification.NewNotification(Title, Message, 5000);
                        }
                        config = ConfigReader.GetConfigValue("GetFocusOnCallDisabled").ToLower();
                        if (!(config == "true" || config == "1") && (Message == "You have incoming call"))
                        {
                            // Minimize window
                            ShowWindow(hWnd, 0x02);
                            // Restore window to previous state.
                            ShowWindow(hWnd, 0x09);
                        }
                        config = ConfigReader.GetConfigValue("GetFocusOnPendingDispositionDisabled").ToLower();
                        if (!(config == "true" || config == "1") && (Message == "You have a disposition pending"))
                        {
                            // Minimize window
                            ShowWindow(hWnd, 0x02);
                            // Restore window to previous state.
                            ShowWindow(hWnd, 0x09);
                        }
                    }
                }
                catch { notification.SetIconVisible(false); }
                finally
                {
                    Thread.Sleep(4999);
                    notification.SetIconVisible(false);
                }
            }