# DI NLog in .Net6 Console App

###### tags: `開發` `DI` `.Net6`

## 參考
* [Wire and inject NLog into .NET Core console app - stackoverflow](https://stackoverflow.com/questions/44838424/wire-and-inject-nlog-into-net-core-console-app)
* [.Net Core Console 使用 DI](https://hackmd.io/@Wayne2021/SJwbrRsEo)
* [Using NLog in a .NET 5 Console Application with Dependency Injection and send logs to AWS CloudWatch - Satish Yadav](https://dev.to/satish/using-nlog-in-a-net-5-console-application-with-dependency-injection-52mm)

## 實作

### 安裝

Install-Package NLog
Install-Package NLog.Web.AspNetCore
Install-Package Microsoft.Extensions.DependencyInjection

### nlog.config
加上 nlog.config 檔案，並設定屬性「複製到輸出目錄：永遠複製」，或是加上以下程式碼。

<ItemGroup>
     <None Update="nlog.config" CopyToOutputDirectory="Always" />
 </ItemGroup>

### Program.cs

// 1. 建立依賴注入的容器
var serviceCollection = new ServiceCollection();
// 2. 註冊服務
serviceCollection.AddTransient<DoSomething>();
// NLog
serviceCollection.AddLogging(loggingBuilder =>
                             {
                                 // loggingBuilder.ClearProviders();
                                 loggingBuilder.AddNLog("nlog.config");
                             });
// 建立依賴服務提供者
var serviceProvider = serviceCollection.BuildServiceProvider();

// 3. 執行主服務
serviceProvider.GetRequiredService<DoSomething>().Run();

### DoSomething.cs

public class DoSomething
{
    private ILogger<DoSomething> _Logger { get; }

    public DoSomething(ILogger<DoSomething> logger)
    {
        _Logger = logger;
    }

    public void Run()
    {
        _Logger.LogTrace("hello world");
    }
}