无法安装Visual Studio扩展.VSIX

Question

我在尝试安装/更新任何visual studio扩展时遇到错误,我在Windows 7上运行Visual Studio 2015企业版.

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????

Answer 1

你有一个名为MachineState.json您的<VS2015 Install Dir>/Common7/IDE/Extensions/文件夹？如果您这样做,请尝试重命名或删除它.

看看Microsoft.VisualStudio.ExtensionManager.Implementation.dll程序集内部,在抛出的函数中System.NullReferenceException,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;
    }
}

该AutoUpdateMachineSettings.Current场吸气试图反序列化JSON文件,我不知道内部是如何工作的,但如果它返回null时失败,可能导致此异常.

另一种可能性是输入extensionIdentifier参数为null,这意味着包含扩展名的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,磁盘上的扩展缓存是否已损坏或损坏,或者某种方式.缓存文件住在<User Dir>/AppData/Local/Microsoft/VisualStudio/14.0/Extensions/和是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,因此我假设当VS意识到它们不存在时它们将被安全地重建,并且从我可以通过快速查看代码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.

如果这些都不起作用,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？