.NET如何制定构建时决策

{
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft": "Warning",
      "Microsoft.Hosting.Lifetime": "Information"
    }
  },
  "AllowedHosts": "*",
  "EnvironmentSpecificSettings": {
    "FilePath": "appsettings.Production.json"
  }
}

var builder = new ConfigurationBuilder()
    .SetBasePath(AppContext.BaseDirectory)
    .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
    .AddJsonFile($"appsettings.{Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT")}.json", optional: true);

var configuration = builder.Build();

#if DEBUG
    Console.WriteLine("Debug mode is enabled.");
#else
    Console.WriteLine("Release mode is enabled.");
#endif

<PropertyGroup>
  <DefineConstants>DEBUG;TRACE</DefineConstants>
</PropertyGroup>

var connectionString = Environment.GetEnvironmentVariable("DB_CONNECTION_STRING");

{
  "ConnectionStrings": {
    "DefaultConnection": "YourConnectionStringHere"
  }
}

var connectionString = Configuration.GetConnectionString("DefaultConnection");