Question

我正在https://www.c-sharpcorner.com/article/building-api-gateway-using-ocelot-in-asp-net-core/上浏览API网关示例

然后我创建一个空的asp.net Web api应用程序，并按照上面链接中所述的步骤进行操作。

Program.cs文件中的Main（）函数是：

    public static void Main(string[] args)
    {
        IWebHostBuilder builder = new WebHostBuilder();
        builder.ConfigureServices(s =>
        {
            s.AddSingleton(builder);
        });
        builder.UseKestrel()
               .UseContentRoot(Directory.GetCurrentDirectory())
               .UseStartup<Startup>()
               .UseUrls("http://localhost:9000");

        var host = builder.Build();
        host.Run();
    }

此外，我的Startup.cs文件具有以下代码：

public class Startup
{
    public Startup(IHostingEnvironment env)
    {
        var builder = new Microsoft.Extensions.Configuration.ConfigurationBuilder();
        builder.SetBasePath(Environment.CurrentDirectory)
               .AddJsonFile("configuration.json", optional: false, reloadOnChange: true)
               .AddEnvironmentVariables();

        Configuration = builder.Build();
    }

    public IConfigurationRoot Configuration { get; private set; }

    // This method gets called by the runtime. Use this method to add services to the container.
    // For more information on how to configure your application, visit https://go.microsoft.com/fwlink/?LinkID=398940
    public void ConfigureServices(IServiceCollection services)
    {
        Action<ConfigurationBuilderCachePart> settings = (x) =>
        {
            x.WithMicrosoftLogging(log =>
            {
                log.AddConsole(LogLevel.Debug);

            }).WithDictionaryHandle();
        };
        services.AddOcelot();
    }

    // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
    public async void Configure(IApplicationBuilder app, IHostingEnvironment env)
    {
        await app.UseOcelot();
    }
}

运行代码时，文件configuration.json NOT FOUND出错。当我在上述函数中检查当前目录的源代码时，我看到Directory.GetCurrentDirectory()返回的路径为C:\\Program Files\\IIS Express，而不是当前项目目录。

我的问题是为什么将路径设置为IIS目录？我该如何解决？

Answer 1

这是 ASP.NET Core 2.2 中的一个错误，该错误已在Github中进行了报告，Microsoft ASP.NET Core团队已提供了以下解决方案，并将在以下位置添加此解决方案： ASP.NET Core的功能版本。

编写如下的帮助类：

function checkFlash() {
    var hasFlash = false;
    try {
        var flash =
            navigator.mimeTypes &&
            navigator.mimeTypes["application/x-shockwave-flash"]
                ? navigator.mimeTypes["application/x-shockwave-flash"].enabledPlugin
                : 0;
        if (flash) hasFlash = true;
    } catch (e) {
        if (navigator.mimeTypes["application/x-shockwave-flash"] != undefined)
            hasFlash = true;
    }

    return hasFlash;
}

然后按如下所示在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 } } }方法中调用SetCurrentDirectory()方法：

Main

现在一切正常！

Answer 2

在.net core 3.0中提供永久修复程序之前，您也可以不进行此操作。要更改此设置，您可以从以下位置更改csproj文件中的设置：

<AspNetCoreHostingModel>inprocess</AspNetCoreHostingModel>

到

<AspNetCoreHostingModel>outofprocess</AspNetCoreHostingModel>

或者，如果您正在IISExpress下运行，则可以在launchsettings.json文件中设置主机模型。在Visual Studion和属性->调试-> Web服务器设置->主机模型中，右键单击项目文件。将其设置为“未处理”将添加

"ancmHostingModel": "OutOfProcess"

到launchsettings.json中的IIS Express配置文件

为什么将“ Environment.CurrentDirectory”设置为“ C：\\ Program Files \\ IIS Express”？

2 个答案: