asp.net-core - appsettings..json 未在服务器上使用

Question

我在我的项目中定义了以下结构。

    appsettings.json
      appsettings.development.json
      appsettings.prod.json
      appsettings.uat.json

程序.cs

    public class Program
    {
        public static void Main(string[] args)
        {
            CreateHostBuilder(args).Build().Run();
        }
    
        public static IHostBuilder CreateHostBuilder(string[] args) =>
            Host.CreateDefaultBuilder(args)
                .ConfigureWebHostDefaults(webBuilder =>
                {
                    webBuilder.ConfigureAppConfiguration((hostingContext, config) =>
                    {
                        var env = hostingContext.HostingEnvironment;
                        config.AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
                            .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true, reloadOnChange: true);
                    });
                    webBuilder.UseStartup<Startup>();
                });
    }

我希望服务器读取阶段特定的应用程序设置文件。但所有环境都始终读取 appsettings.json。

Answer 1

您是否将 appsetting.json 复制到输出目录？

<ItemGroup>
      <None Update="appsettings.Development.json">
        <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
      </None>         
      <None Update="appsettings.P.json">
        <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
      </None>
    </ItemGroup>

如果你想使用环境变量，你应该注册它们.AddEnvironmentVariables()

像这样:

public Startup(IWebHostEnvironment environment)
{
    _environment = environment ?? throw new ArgumentNullException(nameof(environment));

    Configuration = new ConfigurationBuilder()
        .SetBasePath(environment.ContentRootPath)
        .AddJsonFile("appsettings.json", false, true)
        .AddJsonFile($"appsettings.{environment.EnvironmentName}.json", true)
        .AddEnvironmentVariables()
        .Build();
}

我认为只要设置了 DOTNET_ENVIRONMENT，.NET 5 及更高版本就会为您执行此操作。 https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.hosting.host.createdefaultbuilder?view=dotnet-plat-ext-7.0&viewFallbackFrom=net-6.0