.NET Core 2.2 无法发布到 Azure

Question

我有 ASP.NET Core 2.2 项目，可以在本地成功运行。但是当我尝试将其发布到 Azure 时出现错误：

Unhandled Exception: System.ArgumentException: The path must be absolute.
Parameter name: root
   at Microsoft.Extensions.FileProviders.PhysicalFileProvider..ctor(String root, ExclusionFilters filters)
   at Tms.Core.Infrastructure.TmsFileProvider..ctor(IHostingEnvironment hostingEnvironment) in C:\Users\rover\Source\Repos\TMS\Libraries\Tms.Core\Infrastructure\TmsFileProvider.cs:line 23
   at Tms.WebApi.Startup.ConfigureServices(IServiceCollection services) in C:\Users\rover\Source\Repos\TMS\Web\Tms.WebApi\Startup.cs:line 222
--- End of stack trace from previous location where exception was thrown ---
   at Microsoft.AspNetCore.Hosting.ConventionBasedStartup.ConfigureServices(IServiceCollection services)
   at Microsoft.AspNetCore.Hosting.Internal.WebHost.EnsureApplicationServices()
   at Microsoft.AspNetCore.Hosting.Internal.WebHost.Initialize()
   at Microsoft.AspNetCore.Hosting.WebHostBuilder.Build()
   at Tms.WebApi.Program.Main(String[] args) in C:\Users\rover\Source\Repos\TMS\Web\Tms.WebApi\Program.cs:line 17

其中 Program 类的代码如下：

public class Program
{
    public static void Main(string[] args)
    {
        CreateWebHostBuilder(args).Build().Run();
    }

    public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
        WebHost.CreateDefaultBuilder(args)
            .UseStartup<Startup>();
}

启动ConfigureServices方法：

        var provider = services.BuildServiceProvider();
        var hostingEnvironment = provider.GetRequiredService<IHostingEnvironment>();
        CommonHelper.DefaultFileProvider = new TmsFileProvider(hostingEnvironment);

地点：

    public TmsFileProvider(IHostingEnvironment hostingEnvironment) 
        : base(File.Exists(hostingEnvironment.WebRootPath) ? Path.GetDirectoryName(hostingEnvironment.WebRootPath) : hostingEnvironment.WebRootPath)
    {
        var path = hostingEnvironment.ContentRootPath ?? string.Empty;
        if (File.Exists(path))
            path = Path.GetDirectoryName(path);

        BaseDirectory = path;
    }

（不要问我这个代码，这不是我的代码，我只需要使用它）

我很困惑，为什么 Azure 知道我的本地路径 C:\Users\rover\Source\Repos\TMS\Web\Tms.WebApi\，它是在哪里描述的以及如何解决部署问题？

Answer 1

我发现了问题，当wwwroot 文件夹不存在时，hostingEnvironment 可以为空。然后 .NET Core 在 Azure 上抛出这样的异常