无法安装 Visual studio 个扩展 .VSIX

Question

我在尝试 install/update 任何 visual studio 扩展时遇到错误，我是运行 Visual studio 2015 企业版 Windows 7 .

12/12/2016 11:35:11 AM - Microsoft VSIX Installer
12/12/2016 11:35:11 AM - -------------------------------------------
12/12/2016 11:35:11 AM - Initializing Install...
12/12/2016 11:35:11 AM - Extension Details...
12/12/2016 11:35:11 AM -    Identifier         : EntityFramework_Reverse_POCO_Generator..d542a934-8bd6-4136-b490-5f0049d62033
12/12/2016 11:35:11 AM -    Name               : EntityFramework Reverse POCO Generator
12/12/2016 11:35:11 AM -    Author             : Simon Hughes
12/12/2016 11:35:11 AM -    Version            : 2.25.0
12/12/2016 11:35:11 AM -    Description        : Reverse engineers an existing database and generates EntityFramework Code First POCO classes, Configuration mappings and DbContext.
12/12/2016 11:35:11 AM -    Locale             : en-US
12/12/2016 11:35:11 AM -    MoreInfoURL        : https://efreversepoco.codeplex.com/
12/12/2016 11:35:11 AM -    InstalledByMSI     : False
12/12/2016 11:35:11 AM -    SupportedFrameworkVersionRange : [4.5,)
12/12/2016 11:35:11 AM - 
12/12/2016 11:35:11 AM -    SignatureState     : Unsigned
12/12/2016 11:35:11 AM -    References         : 
12/12/2016 11:35:11 AM - Signature Details...
12/12/2016 11:35:11 AM -    Extension is not signed.
12/12/2016 11:35:11 AM - 
12/12/2016 11:35:11 AM - Searching for applicable products...
12/12/2016 11:35:13 AM - Found installed product - Microsoft Visual Studio Enterprise 2015
12/12/2016 11:36:48 AM - The extension will be upgraded from version 2.24.0.
12/12/2016 11:36:48 AM - Found installed product - Microsoft Visual Studio Professional 2015
12/12/2016 11:36:48 AM - Found installed product - Microsoft Visual Studio Community 2015
12/12/2016 11:36:48 AM - Found installed product - Microsoft Visual Studio 2015 Shell (Integrated)
12/12/2016 11:36:48 AM - Found installed product - Global Location
12/12/2016 11:36:48 AM - Found installed product - ssms
12/12/2016 11:37:57 AM - The following target products have been selected...
12/12/2016 11:37:57 AM -    Microsoft Visual Studio Enterprise 2015
12/12/2016 11:37:57 AM - 
12/12/2016 11:37:57 AM - Beginning to install extension to Microsoft Visual Studio Enterprise 2015...
12/12/2016 11:37:57 AM - Upgrading 'EntityFramework Reverse POCO Generator', version 2.24.0 to version 2.25.0.
12/12/2016 11:37:59 AM - Install Error : System.NullReferenceException: Object reference not set to an instance of an object.
   at Microsoft.VisualStudio.ExtensionManager.ExtensionManagerService.RemoveExtensionAutoUpdateSetting(String extensionIdentifier)
   at Microsoft.VisualStudio.ExtensionManager.ExtensionManagerService.UninstallInternal(IInstalledExtension extension, Boolean forceDelete)
   at Microsoft.VisualStudio.ExtensionManager.ExtensionManagerService.CommitInstalledAndUninstalledExtensions(IEnumerable`1 installedExtensions, IEnumerable`1 uninstalledExtensions, IEnumerable`1 packComponentChanges)
   at Microsoft.VisualStudio.ExtensionManager.ExtensionManagerService.BeginInstall(IInstallableExtension installableExtension, Boolean perMachine, AsyncOperation asyncOp, Boolean enforceCertificateCheckForUpgrade)
   at Microsoft.VisualStudio.ExtensionManager.ExtensionManagerService.InstallWorker(IInstallableExtension extension, Boolean perMachine, AsyncOperation asyncOp, Boolean enforceCertificateCheckForUpgrade)
12/12/2016 11:37:59 AM - Reverting uninstall of version 2.24.0 of the extension.

有什么建议吗？？？？

Answer 1

您的 <VS2015 Install Dir>/Common7/IDE/Extensions/ 文件夹中是否有名为 MachineState.json 的文件？如果这样做，请尝试重命名或删除它。

查看 Microsoft.VisualStudio.ExtensionManager.Implementation.dll 程序集内部，在抛出 System.NullReferenceException 的函数中，它看起来像这样：

private static void RemoveExtensionAutoUpdateSetting(string extensionIdentifier)
{
    AutoUpdateMachineSettings current = AutoUpdateMachineSettings.Current;
    if (current.Extensions.Keys.Contains<string>(extensionIdentifier))
    {
        current.Extensions.Remove(extensionIdentifier);
        AutoUpdateMachineSettings.Current = current;
    }
}

AutoUpdateMachineSettings.Current 字段 getter 试图反序列化那个 JSON 文件，我不确定它在内部是如何工作的，但是如果它 returns null 失败时，可能会导致此异常。

另一种可能性是输入 extensionIdentifier 参数为空，这意味着包含扩展头信息的结构包含空扩展 Identifier。我能看到这种情况发生的唯一方法是，如果磁盘上的扩展缓存以某种方式损坏或损坏或其他原因。缓存文件位于 <User Dir>/AppData/Local/Microsoft/VisualStudio/14.0/Extensions/ 中，是 extensions.<locale>.cache 和 extensionSdks.<locale>.cache 文件。尝试删除或重命名这些文件，然后再次尝试更新。它们是缓存文件，所以我假设当 VS 意识到它们不存在时它们会安全地重建，并且从我快速查看代码可以看出它们似乎只包含一堆二进制文件有关已安装扩展的元数据。

如果 none 有效，也许您可以将调试器附加到安装程序，然后提供有关抛出的异常的更多信息？

Answer 2

对我来说，我将包复制到本地计算机的文件夹 --> 向所有人授予文件共享访问权限 --> 单击确定 --> 然后安装包。请注意，您必须重新启动 Visual studio

无法安装 Visual studio 个扩展 .VSIX

Failed to install Visual studio extensions .VSIX

vsix

visual-studio-2015