asp.net Core 2 Web API appsetting.json 值在部署为 Windows 服务时不会被读取

Question

我正在运行ASP.NET Core 2 Web API作为Windows服务。当我通过IIS进行调试时，我可以读取我的配置值没问题。

但是，一旦我作为服务运行它，我就不会收回任何值。

appsettings.json
{
  "Database": {
    "DatabaseName": "testdb",
    "DatabaseServer": "localhost",
    "DatabaseUserName": "admin",
    "DatabasePassword": "admin"
  }
}
 public string GetConnectionString()
    {
        var databaseName = Configuration["Database:DatabaseName"];
        var databaseServer = Configuration["Database:DatabaseServer"];
        var username = Configuration["Database:DatabaseUserName"];
        var password = Configuration["Database:DatabasePassword"];

        return $"Data Source={databaseServer};Initial Catalog={databaseName};Persist Security Info=True;User ID={username};Password={password};MultipleActiveResultSets=True";
    }

不确定为什么一旦发布了应用程序，我为什么无法读取这些值。在已发布的appSettings.json文件中，值在那里。

这是我的启动。我的印象是我不必在新的ASP.NET Core 2中引用appsettings.json文件。感谢您的帮助。

public class Startup
{
    public Startup(IConfiguration configuration)
    {
        Configuration = configuration;
    }
    public IConfiguration Configuration { get; }
    // This method gets called by the runtime. Use this method to add services to the container.
    public void ConfigureServices(IServiceCollection services)
    {
        services.AddMvc();
        AutoMapper.Mapper.Initialize(cfg =>
        {
            cfg.CreateMap<InventoryTransaction, Models.InventoryTransactionModel>();
            cfg.CreateMap<ReasonCode, Models.ReasonCodeModel>();
            cfg.CreateMap<InventoryTransaction, Models.InventoryTransactionForCreationModel>();
            cfg.CreateMap<InventoryTransactionForCreationModel, InventoryTransaction>();
        });
        services.AddScoped<IInventoryTransactionRepository, InventoryTransactionRepository>();
        services.AddSingleton<IConfiguration>(Configuration);
        services.AddDbContext<VPSInventoryContext>(options => options.UseSqlServer(GetConnectionString()));
    }
    // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
    public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
    {
        loggerFactory.AddConsole();
        loggerFactory.AddDebug();
        loggerFactory.AddNLog();
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }
        app.UseMvc();
    }
    public string GetConnectionString()
    {
        var databaseName = Configuration["Database:DatabaseName"];
        var databaseServer = Configuration["Database:DatabaseServer"];
        var username = Configuration["Database:DatabaseUserName"];
        var password = Configuration["Database:DatabasePassword"];

        return $"Data Source={databaseServer};Initial Catalog={databaseName};Persist Security Info=True;User ID={username};Password={password};MultipleActiveResultSets=True";
    }
}

这是我的program.cs，我以Windows服务运行它。

public class Program
{
    public static void Main(string[] args)
    {
        if (Debugger.IsAttached || args.Contains("--debug"))
        {
            BuildWebHost(args).Run();
        }
        else
        {
            BuildWebHost(args).RunAsService();
        }
    }
    public static IWebHost BuildWebHost(string[] args) =>
        WebHost.CreateDefaultBuilder(args)
            .UseStartup<Startup>()
            .Build();
}

Answer 1

当您以服务启动应用程序时，工作目录将设置为系统目录，例如C:WindowsSystem32。在同一目录中查看配置文件。至于那里缺少，您可以加载空配置。

要修复它，只需将工作目录设置为应用程序所在的一个：

public static void Main(string[] args)
{
    if (Debugger.IsAttached || args.Contains("--debug"))
    {
        BuildWebHost(args).Run();
    }
    else
    {
        var path = Path.GetDirectoryName(Assembly.GetEntryAssembly().Location);
        Directory.SetCurrentDirectory(path);
        BuildWebHost(args).RunAsService();
    }
}