Xaml 设计器未加载

Question

今天我安装了 Visual Studio Community 2015 with Update 1，当它尝试加载 Xaml Designer（即使是新项目）时它抛出异常：

An unhandled exception has occured

System.Runtime.InteropServices.COMException The app did not start. (Exception from HRESULT: 0x8027025B)

at
Microsoft.VisualStudio.DesignTools.HostUtility.AppPackage.AppPackageNativeMethods.IApplicationActivationManager.ActivateApplication(String appUserModelId, String activationContext, ActivateOptions options, Int32& processId)
at Microsoft.VisualStudio.DesignTools.HostUtility.AppPackage.DesignerWrtUtility.ActivateApplication(String appUserModelId, String activationContext, Object site, Boolean isRunningElevated)
at Microsoft.VisualStudio.DesignTools.HostUtility.Platform.AppContainerProcessDomainFactory.ActivateApplicationInternal(String appUserModelId, String activationContext, Object site)
at Microsoft.VisualStudio.DesignTools.HostUtility.Platform.AppContainerProcessDomainFactory.CreateDesignerProcess(String applicationPath, String clientPort, Uri hostUri, IDictionary environmentVariables, Int32& processId, Object& processData)
at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Primitives.ProcessDomainFactory.ProcessIsolationDomain..ctor(ProcessDomainFactory factory, IIsolationBoundary boundary, AppDomainSetup appDomainInfo, IIsolationTarget isolationTarget, String baseDirectory)
at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Primitives.ProcessDomainFactory.CreateIsolationDomain(IIsolationBoundary boundary)
at Microsoft.VisualStudio.DesignTools.HostUtility.Platform.AppContainerProcessDomainFactory.CreateIsolationDomain(IIsolationBoundary boundary)
at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Primitives.IsolationBoundary.Initialize()
at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Primitives.IsolationBoundary.CreateInstance[T](Type type)
at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.IsolatedObjectFactory.Initialize()
at Microsoft.VisualStudio.DesignTools.DesignerHost.Services.VSIsolationService.CreateObjectFactory(IIsolationTarget isolationTarget, IObjectCatalog catalog)
at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.IsolationService.CreateLease(IIsolationTarget isolationTarget)
at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.IsolationService.CreateLease(IIsolationTarget isolationTarget)
at Microsoft.VisualStudio.DesignTools.DesignerContract.IsolatedDesignerService.CreateLease(IIsolationTarget isolationTarget, CancellationToken cancelToken, DesignerServiceEntry& entry, IServiceProvider serviceOverrides)
at Microsoft.VisualStudio.DesignTools.DesignerContract.IsolatedDesignerService.IsolatedDesignerView.CreateDesignerViewInfo(CancellationToken cancelToken)
at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.IsolatedTaskScheduler.InvokeWithCulture[T](CultureInfo culture, Func'2 func, CancellationToken cancelToken)
at
Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.IsolatedTaskScheduler.<>c__DisplayClass10_0'1.b__0()
at System.Threading.Tasks.Task`1.InnerInvoke()
at System.Threading.Tasks.Task.Execute()

Answer 1

• 如果您使用的是 HP：

在控制面板 > 系统 > 高级系统设置 > 环境变量中删除 "Platform" 环境变量 [...] =HPD。 ()

• 如果您没有使用 HP，请尝试执行以下步骤：

  1. 关闭 Visual Studio
  的任何实例
  2. 打开 Visual Studio 并创建一个新的 C# UWP 空项目（随便命名）
  3. 运行新建"useless"项目，然后关闭为Visual Studio
  4. 重新打开您之前的项目。 (source)

• 如果您最近将 Windows 10 SDK 从 10240 升级到 10586，请尝试将项目 Properties > Application > "Target version" 设置为 Windows 10 ( 10.0；构建 10240）。 ()

如果有帮助请告诉我！

Answer 2

我遇到了同样的问题，已解决：

• 卸载Visual Studio
• 全部卸载WindowsSDKs/Emulators
• 重新安装一切

之后一切正常。