c# - 无法在 asp.net core web API 6.0 中获取环境变量

Question

我正在使用 asp .net core web API 6.0(干净的架构项目)。

这是我的 appsettings.Production.json 和 appsettings.Development.json

  {
"Tokens": {
    "Key": "my-token",
    "Issuer": "issuer",
    "Audience": "audience",
    "ExpirationInMinutes": 1440
  },
// removed rest
}

using Microsoft.Extensions.Configuration;

    public static IServiceCollection AddTokenAuthentication(this IServiceCollection services, IConfiguration config)
    {
        var secret = config.GetValue<string>("Tokens:Key");  // this value is null while running in development / production mode. 

        var key = Encoding.ASCII.GetBytes(secret);
         // removed rest
      }

我在开发/生产环境运行时终端报错

Unhandled exception. System.ArgumentNullException: String reference not set to an instance of a String. (Parameter 's') at System.Text.Encoding.GetBytes(String s) at Infrastructure.Files.AuthenticationExtension.AddTokenAuthentication(IServiceCollection services, IConfiguration config) in /src/Infrastructure/Files/AuthenticationExtension.cs:line 14 at Infrastructure.DependencyInjection.AddInfrastructure(IServiceCollection services, IConfiguration configuration) in /src/Infrastructure/DependencyInjection.cs:line 75 at Program.<Main>$(String[] args) in/src/WebApi/Program.cs:line 21 Aborted (core dumped)

注意:如果我像这样硬编码 secret 的值 var secret = "my-token"; 那么项目在两个环境中都运行良好。

在开发和生产环境中运行时，所有环境变量均为空。

GetConnectionString 的相同错误

public static IServiceCollection AddInfrastructure(this IServiceCollection services, IConfiguration configuration)
    {

        services.AddDbContext<DbContext>(options =>
            options.UseNpgsql(
                configuration.GetConnectionString("DefaultConnection"),  // this is also null while running in both environment.. If I hard-coded then working fine
                b => b.MigrationsAssembly(typeof(DbContext).Assembly.FullName))
                .EnableSensitiveDataLogging());
// removed rest
}

为什么会这样？我的代码有错误吗？请帮我找出错误？

编辑:我也试过从 appsettings.Development.json 复制所有内容并将其粘贴到 appsettings.json那是行不通的。

这是我的启动设置.json

"WebApi": {
      "commandName": "Project",
      "dotnetRunMessages": true,
      "launchBrowser": false,
      "launchUrl": "swagger",
      "applicationUrl": "http://localhost:5000",
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development"
      }
    },
    "WebApi-Production": {
      "commandName": "Project",
      "dotnetRunMessages": true,
      "launchBrowser": true,
      "applicationUrl": "https://localhost:7152;http://localhost:5105",
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Production"
      }
    },

Answer 1

生产环境是否设置环境变量ASPNETCORE_ENVIRONMENT=Production？

默认情况下，ASP.NET Core 将从 appsettings.json 文件和 appsettings.Environment.json 文件(例如 appsettings.Development.json)读取配置。

您可以在生产环境中设置 ASPNETCORE_ENVIRONMENT=Production 或在 appsettings.json 文件中设置生产配置。

这些文档可能对您有帮助:

• Configuration in ASP.NET Core
• Use multiple environments in ASP.NET Core

----------------例如------------
我的 appsettings.json

{
    "EFCoreSlowQuery": {
        "ServiceName": "json",
        "SlowQueryThresholdMilliseconds": 10
    }
}

在代码中读取配置: