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# ASP.NET Core 2.x 使用Nlog
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## 第一步
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> 创建一个 ASP.NET Core 2.ｘ 项目
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## 第二步
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> 添加nuget包
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> + NLog
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> + NLog.Web.AspNetCore
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> + NLog.Extensions.Logging
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## 第三步
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> 根目录创建配置文件 nlog.config, 至少配置一项Target和一项Rules
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## 第四步
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> 配置文件属性配置为"复制到输出目录"
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## 第五步
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> 更新 program.cs
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``` csharp
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using NLog.Web;
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using Microsoft.Extensions.Logging;
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public static void Main(string[] args)
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{
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// NLog: setup the logger first to catch all errors
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var logger = NLog.Web.NLogBuilder.ConfigureNLog("nlog.config").GetCurrentClassLogger();
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try
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{
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logger.Debug("init main");
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CreateWebHostBuilder(args).Build().Run();
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}
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catch (Exception ex)
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{
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//NLog: catch setup errors
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logger.Error(ex, "Stopped program because of exception");
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throw;
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}
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finally
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{
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// Ensure to flush and stop internal timers/threads before application-exit (Avoid segmentation fault on Linux)
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NLog.LogManager.Shutdown();
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}
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}
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public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
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WebHost.CreateDefaultBuilder(args)
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.UseStartup<Startup>()
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.ConfigureLogging(logging =>
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{
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logging.ClearProviders();
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logging.SetMinimumLevel(Microsoft.Extensions.Logging.LogLevel.Trace);
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})
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.UseNLog(); // NLog: setup NLog for Dependency injection
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```
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## 第六步
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> 配置 appsettings.json
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> 在appsettings.json中指定的日志配置将覆盖对setminimumlevel的任何调用。所以要么去掉“默认”：要么根据你的需要调整它。
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``` json
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{
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"Logging": {
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"LogLevel": {
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"Default": "Trace",
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"Microsoft": "Information"
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}
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}
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}
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```
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> 记住还要更新任何特定于环境的配置，以避免任何意外。例如：appsettings.development.json
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## 第七步
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> 写日志：在controller中，注入 ILogger
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```csharp
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using Microsoft.Extensions.Logging;
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public class HomeController : Controller
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{
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private readonly ILogger<HomeController> _logger;
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public HomeController(ILogger<HomeController> logger)
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{
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_logger = logger;
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}
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public IActionResult Index()
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{
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_logger.LogInformation("Index page says hello");
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return View();
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}
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}
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```
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## 第八步
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> 查看日志 |