.NET Core 5 Console 泛用主機 依照環境變數讀取對應設定檔 AppSetting
筆記下 Console 達到如同 Web Application 讀取設定檔
.Net 3.0 以後環境變數名稱規則變更如下所示
Console => DOTNET_ENVIRONMENT
Web => ASPNETCORE_ENVIRONMENT (值會覆寫 DOTNET_ENVIRONMENT)
.Net 3.0 以前環境變數名稱皆為 ASPNETCORE_ENVIRONMENT
NEW
開一個全新的 .Net Core Console 專案
Nuget
Microsoft.Extensions.Hosting
Microsoft.Extensions.Hosting.Abstractions
Microsoft.Extensions.Configuration.Abstractions
Code
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
namespace ConsoleApp1
{
class Program
{
public static void Main(string[] args)
{
CreateHostBuilder(args).Build().Run();
}
public static IHostBuilder CreateHostBuilder(string[] args) =>
Host.CreateDefaultBuilder(args)
.ConfigureServices((hostContext, services) =>
{
services.AddHostedService<AlbertService>();
})
.ConfigureAppConfiguration((builderContext, config) =>
{
config.AddJsonFile("appsettings.json", optional: false, reloadOnChange: true)
.AddJsonFile(
$"appsettings.{builderContext.HostingEnvironment.EnvironmentName}.json"
, optional: true, reloadOnChange: true);
});
}
}
Service
using System;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Hosting;
namespace ConsoleApp1
{
public class TestService:IHostedService
{
private readonly IConfiguration Configuration;
public TestService(IConfiguration configuration)
{
Configuration = configuration;
}
public async Task StartAsync(CancellationToken cancellationToken)
{
Console.WriteLine(Configuration["MyKey"]);
}
public async Task StopAsync(CancellationToken cancellationToken)
{
Console.WriteLine(Configuration["MyKey"]);
}
}
}
appsettings.Test.json (記得屬性要改成 Always Copy 不然會找不到檔案)
{
"MyKey": "測試值",
}
launchSettings.json
{
"$schema": "http://json.schemastore.org/launchsettings.json",
"profiles": {
"ConsoleApp1": {
"commandName": "Project",
"environmentVariables": {
"DOTNET_ENVIRONMENT": "Test"
}
}
}
}
※ .Net 3.0 以上環境變數為 DOTNET_ENVIRONMENT
參照
PS5
.Net Core
App Service
Azure
EnvironmentVariables
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13 October 2025