builder.Services.AddControllersWithViews().AddNewtonsoftJson();

#if !DEBUG //发布状态下把模板拿出来
builder.Services.AddMvc().AddRazorRuntimeCompilation();
#endif
builder.Services.AddSingleton<IFileProvider>(new PhysicalFileProvider(Directory.GetCurrentDirectory()));

public class HomeController : Controller
{
    private readonly ILogger<HomeController> _logger;
    private readonly IWebHostEnvironment _webHostEnvironment;
    private readonly IFileProvider _fileProvider;

    public HomeController(ILogger<HomeController> logger, IFileProvider fileProvider, IWebHostEnvironment webHostEnvironment)
    {
        _logger = logger;
        _webHostEnvironment = webHostEnvironment;
        _fileProvider = fileProvider;
    }

    public IActionResult Index()
    {
        string file = ReadLayoutViewContent(_fileProvider, "_Layout");

        Console.WriteLine(file);

        return View("~/Views/Home/Index.cshtml");

        //return View();
    }

    public IActionResult Privacy()
    {
        return View("~/Views/Home/Index.cshtml");
    }

    private string ReadLayoutViewContent(IFileProvider _fileProvider, string layoutViewName)
    {
        var viewFileInfo = _fileProvider.GetFileInfo($"Views/Shared/{layoutViewName}.cshtml");
        //var viewFileInfo = _fileProvider.GetFileInfo(RuntimeEnvironment.GetRuntimeDirectory()+"/Views/Home/Index.cshtml");

        if (viewFileInfo.Exists)
        {
            using (var streamReader = new StreamReader(viewFileInfo.CreateReadStream()))
            {
                return streamReader.ReadToEnd();
            }
        }
        throw new Exception($"找不到模板页面（模板页面:{layoutViewName}）！");
    }

    [ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
    public IActionResult Error()
    {
        return View(new ErrorViewModel { RequestId = Activity.Current?.Id ?? HttpContext.TraceIdentifier });
    }
}

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