Question

在Visual Studio 2019 v16.4.1中，当尝试运行安装了React的ASP.NET Core Web应用程序时，我在加载网页中遇到错误：

Failed to start 'npm': Ensure that 'npm' is installed and can be found in one of the PATH directories.

在“系统环境变量”中，“路径”包括C：\ Program Files \ nodejs和C：\ Users \ me \ AppData \ Roaming \ npm等。

在VS 2019软件包管理器控制台中输入'npm'不会产生任何错误，并以npm@6.12.1 C:\Program Files\nodejs\node_modules\npm结尾。这样就可以了。

页面上的InnerException包括：

System.ComponentModel.Win32Exception (267): The directory name is invalid.

此错误已被记录并标记为已解决：

https://github.com/aspnet/AspNetCore/issues/6342

"but the real rub is hidden in the InnerException:

System.ComponentModel.Win32Exception: The directory name is invalid.
"

但是VS 2019仍然有问题...

有什么办法解决这个问题吗？

System.AggregateException: One or more errors occurred. (One or more errors occurred. (Failed to start 'npm'. To resolve this:.

[1] Ensure that 'npm' is installed and can be found in one of the PATH directories.
    Current PATH enviroment variable is: C:\Program Files (x86)\Intel\iCLS Client\;C:\Program Files\Intel\iCLS Client\;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files (x86)\PuTTY\;C:\Program Files (x86)\Bitvise SSH Client;C:\Program Files\dotnet\;C:\Program Files\Microsoft SQL Server\130\Tools\Binn\;C:\Program Files\Microsoft SQL Server\Client SDK\ODBC\170\Tools\Binn\;C:\Program Files\nodejs\;C:\Users\00082563\AppData\Local\Microsoft\WindowsApps;C:\Users\00082563\.dotnet\tools;C:\Users\00082563\AppData\Local\Programs\Microsoft VS Code\bin;C:\Users\00082563\AppData\Roaming\npm;C:\Users\00082563\.nuget\packages\node.js\5.3.0\tools
    Make sure the executable is in one of those directories, or update your PATH.

[2] See the InnerException for further details of the cause.))

 ---> System.AggregateException: One or more errors occurred. (Failed to start 'npm'. To resolve this:.

[1] Ensure that 'npm' is installed and can be found in one of the PATH directories.
    Current PATH enviroment variable is: C:\Program Files (x86)\Intel\iCLS Client\;C:\Program Files\Intel\iCLS Client\;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files (x86)\PuTTY\;C:\Program Files (x86)\Bitvise SSH Client;C:\Program Files\dotnet\;C:\Program Files\Microsoft SQL Server\130\Tools\Binn\;C:\Program Files\Microsoft SQL Server\Client SDK\ODBC\170\Tools\Binn\;C:\Program Files\nodejs\;C:\Users\00082563\AppData\Local\Microsoft\WindowsApps;C:\Users\00082563\.dotnet\tools;C:\Users\00082563\AppData\Local\Programs\Microsoft VS Code\bin;C:\Users\00082563\AppData\Roaming\npm;C:\Users\00082563\.nuget\packages\node.js\5.3.0\tools
    Make sure the executable is in one of those directories, or update your PATH.

[2] See the InnerException for further details of the cause.)

 ---> System.InvalidOperationException: Failed to start 'npm'. To resolve this:.

[1] Ensure that 'npm' is installed and can be found in one of the PATH directories.
    Current PATH enviroment variable is: C:\Program Files (x86)\Intel\iCLS Client\;C:\Program Files\Intel\iCLS Client\;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files (x86)\PuTTY\;C:\Program Files (x86)\Bitvise SSH Client;C:\Program Files\dotnet\;C:\Program Files\Microsoft SQL Server\130\Tools\Binn\;C:\Program Files\Microsoft SQL Server\Client SDK\ODBC\170\Tools\Binn\;C:\Program Files\nodejs\;C:\Users\00082563\AppData\Local\Microsoft\WindowsApps;C:\Users\00082563\.dotnet\tools;C:\Users\00082563\AppData\Local\Programs\Microsoft VS Code\bin;C:\Users\00082563\AppData\Roaming\npm;C:\Users\00082563\.nuget\packages\node.js\5.3.0\tools
    Make sure the executable is in one of those directories, or update your PATH.

[2] See the InnerException for further details of the cause.

 ---> System.ComponentModel.Win32Exception (267): The directory name is invalid.

   at System.Diagnostics.Process.StartWithCreateProcess(ProcessStartInfo startInfo)

   at System.Diagnostics.Process.Start()

   at System.Diagnostics.Process.Start(ProcessStartInfo startInfo)

   at Microsoft.AspNetCore.NodeServices.Npm.NpmScriptRunner.LaunchNodeProcess(ProcessStartInfo startInfo)

   --- End of inner exception stack trace ---

   at Microsoft.AspNetCore.NodeServices.Npm.NpmScriptRunner.LaunchNodeProcess(ProcessStartInfo startInfo)

   at Microsoft.AspNetCore.NodeServices.Npm.NpmScriptRunner..ctor(String workingDirectory, String scriptName, String arguments, IDictionary`2 envVars)

   at Microsoft.AspNetCore.SpaServices.ReactDevelopmentServer.ReactDevelopmentServerMiddleware.StartCreateReactAppServerAsync(String sourcePath, String npmScriptName, ILogger logger)

   --- End of inner exception stack trace ---

   at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)

   at System.Threading.Tasks.Task`1.GetResultCore(Boolean waitCompletionNotification)

   at System.Threading.Tasks.Task`1.get_Result()

   at Microsoft.AspNetCore.SpaServices.ReactDevelopmentServer.ReactDevelopmentServerMiddleware.<>c.<Attach>b__2_0(Task`1 task)

   at System.Threading.Tasks.ContinuationResultTaskFromResultTask`2.InnerInvoke()

   at System.Threading.Tasks.Task.<>c.<.cctor>b__274_0(Object obj)

   at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)

--- End of stack trace from previous location where exception was thrown ---

   at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)

   at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot, Thread threadPoolThread)

   --- End of inner exception stack trace ---

   at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)

   at System.Threading.Tasks.Task`1.GetResultCore(Boolean waitCompletionNotification)

   at System.Threading.Tasks.Task`1.get_Result()

   at Microsoft.AspNetCore.SpaServices.Extensions.Util.TaskTimeoutExtensions.WithTimeout[T](Task`1 task, TimeSpan timeoutDelay, String message)

   at Microsoft.AspNetCore.SpaServices.Extensions.Proxy.SpaProxy.PerformProxyRequest(HttpContext context, HttpClient httpClient, Task`1 baseUriTask, CancellationToken applicationStoppingToken, Boolean proxy404s)

   at Microsoft.AspNetCore.Builder.SpaProxyingExtensions.<>c__DisplayClass2_0.<<UseProxyToSpaDevelopmentServer>b__0>d.MoveNext()

--- End of stack trace from previous location where exception was thrown ---

   at Microsoft.AspNetCore.Builder.RouterMiddleware.Invoke(HttpContext httpContext)

   at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)

我在以下位置提交了问题：

https://developercommunity.visualstudio.com/content/problem/858687/failed-to-start-npm-ensure-that-npm-is-installed-a.html

Answer 1

我遇到了同样的错误。我以管理员身份打开cmd并按照user12076510的说明运行命令npm install -g npm并重新启动系统-错误消失了

Answer 2

此问题已在此处讨论并解决：

https://github.com/dotnet/aspnetcore/issues/6342#issue-395713046

错误消息是红色鲱鱼。真正的问题是客户端应用程序的路径错误。 Visual Studio模板将其放置在错误的位置。

打开startup.cs，查找Configuration.RootPath和spa.Options.SourcePath，并确保将它们设置为真实路径。如果没有，请修复它们。

无法启动“ npm”：确保已安装并可以找到“ npm”

2 个答案: