C# 如何让WebBrowser正常运行

我使用VS2017在C#中管理Excel加载项

加载项使用用于访问特定网页的WebBrowser。 它最近停止在我所有的插件版本（开发版和发布版）上运行，尽管我还并没有看到任何关于它的补丁说明

基本上，WebBrowser控件不再显示。它的所有属性都已正确设置，html文档在导航时已正确加载，但没有显示任何内容来代替控件。控件及其父组件被设置为可见，并使用正确的大小和坐标正确加载

我用visualstudio设置了一个新的blank项目，并用一个WebBrowser控件测试了它，该控件试图显示google和about:blank，但没有成功。 代码如下：

本附件cs：

    public partial class ThisAddIn
    {
        private void ThisAddIn_Startup(object sender, System.EventArgs e)
        {
        }

        private void ThisAddIn_Shutdown(object sender, System.EventArgs e)
        {
        }

        protected override Microsoft.Office.Core.IRibbonExtensibility CreateRibbonExtensibilityObject()
        {
            return new MyRibbon();
        }

        #region VSTO generated code

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InternalStartup()
        {
            this.Startup += new System.EventHandler(ThisAddIn_Startup);
            this.Shutdown += new System.EventHandler(ThisAddIn_Shutdown);
        }

        #endregion
    }

    [ComVisible(true)]
    public class MyRibbon : Office.IRibbonExtensibility
    {
        private Office.IRibbonUI ribbon;

        public MyRibbon()
        {
        }

        #region IRibbonExtensibility Members

        public string GetCustomUI(string ribbonID)
        {
            return GetResourceText("WebBrowserShowcase.MyRibbon.xml");
        }

        #endregion

        #region Ribbon Callbacks
        //Create callback methods here. For more information about adding callback methods, visit https://go.microsoft.com/fwlink/?LinkID=271226

        public void Ribbon_Load(Office.IRibbonUI ribbonUI)
        {
            this.ribbon = ribbonUI;
        }

        public void openWebBrowser_click(IRibbonControl control)
        {
            WebPanel panel = new WebPanel();
            panel.ShowWebBrowser();
        }

        public string getTabLabel(IRibbonControl control) { return "WebBrowserShowCase"; }

        #endregion
    }

<?xml version="1.0" encoding="UTF-8"?>
<customUI onLoad="Ribbon_Load" xmlns="http://schemas.microsoft.com/office/2009/07/customui">
  <ribbon>
    <tabs>
      <tab id="myRibbon" getLabel="getTabLabel">
        <group id="MyGroup" label="My Group">
          <button id="OpenWebBrowser" size="large" onAction="openWebBrowser_click" imageMso="_3DDirectionGalleryClassic"/>
        </group>
      </tab>
    </tabs>
  </ribbon>
</customUI>

    public class WebPanel : UserControl
    {
        TableLayoutPanel tableLayoutPanel1;
        WebBrowser _webBrowser;

        public WebPanel()
        {
            InitializeComponent();
            WebBrowserHelper.FixBrowserVersion();
        }

        public void ShowWebBrowser()
        {
            CustomTaskPane taskPane = Globals.ThisAddIn.CustomTaskPanes.Add(this, "title", Globals.ThisAddIn.Application.ActiveWindow);
            DisplayTaskPane(taskPane);
            Navigate();
        }

        private void DisplayTaskPane(CustomTaskPane taskPane)
        {
            taskPane.DockPosition = Microsoft.Office.Core.MsoCTPDockPosition.msoCTPDockPositionLeft;
            taskPane.Width = Convert.ToInt32(Globals.ThisAddIn.Application.ActiveWindow.Width);
            taskPane.DockPositionRestrict = Microsoft.Office.Core.MsoCTPDockPositionRestrict.msoCTPDockPositionRestrictNoHorizontal;
            taskPane.Visible = true;

            tableLayoutPanel1.Dock = DockStyle.Fill;
            tableLayoutPanel1.Visible = true;

            _webBrowser.Dock = DockStyle.Fill;
            _webBrowser.Visible = true;
        }

        private void Navigate()
        {
            _webBrowser.Navigate(new Uri("about:blank"));
        }
    }

MyRibbon.xml：

    public partial class ThisAddIn
    {
        private void ThisAddIn_Startup(object sender, System.EventArgs e)
        {
        }

        private void ThisAddIn_Shutdown(object sender, System.EventArgs e)
        {
        }

        protected override Microsoft.Office.Core.IRibbonExtensibility CreateRibbonExtensibilityObject()
        {
            return new MyRibbon();
        }

        #region VSTO generated code

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InternalStartup()
        {
            this.Startup += new System.EventHandler(ThisAddIn_Startup);
            this.Shutdown += new System.EventHandler(ThisAddIn_Shutdown);
        }

        #endregion
    }

    [ComVisible(true)]
    public class MyRibbon : Office.IRibbonExtensibility
    {
        private Office.IRibbonUI ribbon;

        public MyRibbon()
        {
        }

        #region IRibbonExtensibility Members

        public string GetCustomUI(string ribbonID)
        {
            return GetResourceText("WebBrowserShowcase.MyRibbon.xml");
        }

        #endregion

        #region Ribbon Callbacks
        //Create callback methods here. For more information about adding callback methods, visit https://go.microsoft.com/fwlink/?LinkID=271226

        public void Ribbon_Load(Office.IRibbonUI ribbonUI)
        {
            this.ribbon = ribbonUI;
        }

        public void openWebBrowser_click(IRibbonControl control)
        {
            WebPanel panel = new WebPanel();
            panel.ShowWebBrowser();
        }

        public string getTabLabel(IRibbonControl control) { return "WebBrowserShowCase"; }

        #endregion
    }

<?xml version="1.0" encoding="UTF-8"?>
<customUI onLoad="Ribbon_Load" xmlns="http://schemas.microsoft.com/office/2009/07/customui">
  <ribbon>
    <tabs>
      <tab id="myRibbon" getLabel="getTabLabel">
        <group id="MyGroup" label="My Group">
          <button id="OpenWebBrowser" size="large" onAction="openWebBrowser_click" imageMso="_3DDirectionGalleryClassic"/>
        </group>
      </tab>
    </tabs>
  </ribbon>
</customUI>

    public class WebPanel : UserControl
    {
        TableLayoutPanel tableLayoutPanel1;
        WebBrowser _webBrowser;

        public WebPanel()
        {
            InitializeComponent();
            WebBrowserHelper.FixBrowserVersion();
        }

        public void ShowWebBrowser()
        {
            CustomTaskPane taskPane = Globals.ThisAddIn.CustomTaskPanes.Add(this, "title", Globals.ThisAddIn.Application.ActiveWindow);
            DisplayTaskPane(taskPane);
            Navigate();
        }

        private void DisplayTaskPane(CustomTaskPane taskPane)
        {
            taskPane.DockPosition = Microsoft.Office.Core.MsoCTPDockPosition.msoCTPDockPositionLeft;
            taskPane.Width = Convert.ToInt32(Globals.ThisAddIn.Application.ActiveWindow.Width);
            taskPane.DockPositionRestrict = Microsoft.Office.Core.MsoCTPDockPositionRestrict.msoCTPDockPositionRestrictNoHorizontal;
            taskPane.Visible = true;

            tableLayoutPanel1.Dock = DockStyle.Fill;
            tableLayoutPanel1.Visible = true;

            _webBrowser.Dock = DockStyle.Fill;
            _webBrowser.Visible = true;
        }

        private void Navigate()
        {
            _webBrowser.Navigate(new Uri("about:blank"));
        }
    }

为了方便起见，我删除了一些自动生成的代码和您将在此处找到的WebBrowserHelper：

这是WebPanel的图像，它是TableLayout组件中的WebBrowser：

以下是启动项目、进入功能区并单击按钮时的结果：

如您所见，WebBrowser不显示。我尝试了使用和不使用Uri，关于：blank和google，但结果总是一样的

有人知道这里可能有什么问题吗

编辑：
显然，WebBrowser在Windows7上仍然有效，但在Windows10上不起作用。 我用几台都有相同internet explorer版本（11.0.17134.829）的机器进行了检查。

---

如果操作系统出了问题，我能做些什么吗？

我们也遇到了同样的问题。除了他在Outlook中遇到问题外，还有一条类似的线索。确定的解决方法是在Outlook或Excel>>文件>>选项>>常规中从“优化最佳外观”切换到“优化兼容性”。我可以确认这对我们的Excel加载项有效

你好，亚历克斯，谢谢你的回答。我确认切换到兼容模式是可行的，不幸的是，我不能依赖此解决方案，因为我不能告诉和/或强制我的加载项的用户这样做。尽管如此，我们还是非常感谢你的提醒。