1.错误再现
利用VS2019预览版创建ASP.NET Core 的单页面Web程序
创建后直接运行,出现如下错误
Ensure that 'npm' is installed and can be found in one of the PATH directories.
2.相关资料
找到以下资料
https://github.com/aspnet/AspNetCore/issues/5263
3.解决方案
添加类CurrentDirectoryHelpers,代码如下
using System; using System.Collections.Generic; using System.Linq; using System.Threading.Tasks; namespace WebApplication6 { public class CurrentDirectoryHelpers { internal const string AspNetCoreModuleDll = "aspnetcorev2_inprocess.dll"; [System.Runtime.InteropServices.DllImport("kernel32.dll")] private static extern IntPtr GetModuleHandle(string lpModuleName); [System.Runtime.InteropServices.DllImport(AspNetCoreModuleDll)] private static extern int http_get_application_properties(ref IISConfigurationData iiConfigData); [System.Runtime.InteropServices.StructLayout(System.Runtime.InteropServices.LayoutKind.Sequential)] private struct IISConfigurationData { public IntPtr pNativeApplication; [System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.UnmanagedType.BStr)] public string pwzFullApplicationPath; [System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.UnmanagedType.BStr)] public string pwzVirtualApplicationPath; public bool fWindowsAuthEnabled; public bool fBasicAuthEnabled; public bool fAnonymousAuthEnable; } public static void SetCurrentDirectory() { try { // Check if physical path was provided by ANCM var sitePhysicalPath = Environment.GetEnvironmentVariable("ASPNETCORE_IIS_PHYSICAL_PATH"); if (string.IsNullOrEmpty(sitePhysicalPath)) { // Skip if not running ANCM InProcess if (GetModuleHandle(AspNetCoreModuleDll) == IntPtr.Zero) { return; } IISConfigurationData configurationData = default(IISConfigurationData); if (http_get_application_properties(ref configurationData) != 0) { return; } sitePhysicalPath = configurationData.pwzFullApplicationPath; } Environment.CurrentDirectory = sitePhysicalPath; } catch { // ignore } } } }
在Main方法中调用
运行,发现神奇般的好啦!!!