.NET 云原生架构师训练营（模块二 基础巩固 日志）--学习笔记

private readonly ILogger<WeatherForecastController> _logger;

public WeatherForecastController(ILogger<WeatherForecastController> logger)
{
    _logger = logger;
}

_logger.LogInformation("Get action executed");

_logger.LogInformation(new EventId(1001, "Action"), "Get action executed");

private readonly ILogger<WeatherForecastController> _logger;
private readonly ILogger _myLogger;

public WeatherForecastController(ILogger<WeatherForecastController> logger, ILoggerFactory loggerFactory)
{
    _logger = loggerFactory.CreateLogger<WeatherForecastController>();
    _myLogger = loggerFactory.CreateLogger("MyLogger");// 通过自己的分类 MyLogger 创建
}

using System;

namespace Microsoft.Extensions.Logging
{
    /// <summary>
    /// Represents a type that can create instances of <see cref="ILogger"/>.
    /// </summary>
    public interface ILoggerProvider : IDisposable
    {
        /// <summary>
        /// Creates a new <see cref="ILogger"/> instance.
        /// </summary>
        /// <param name="categoryName">The category name for messages produced by the logger.</param>
        /// <returns></returns>
        ILogger CreateLogger(string categoryName);
    }
}

var providers = host.Services.GetServices<ILoggerProvider>();// 获取容器中所有注入的实例
foreach (var provider in providers)
{
    Console.WriteLine(provider.GetType().ToString());
}

Microsoft.Extensions.Logging.Console.ConsoleLoggerProvider
Microsoft.Extensions.Logging.Debug.DebugLoggerProvider
Microsoft.Extensions.Logging.EventSource.EventSourceLoggerProvider
Microsoft.Extensions.Logging.EventLog.EventLogLoggerProvider

public static IHostBuilder CreateHostBuilder(string[] args) =>
    Host.CreateDefaultBuilder(args)
        .ConfigureLogging((ctx, logger) =>
        {
            //logger.AddProvider();// 添加
            logger.ClearProviders();// 清除
        })

//.ConfigureLogging((ctx, logger) =>
//{
//    //logger.AddProvider();// 添加
//    logger.ClearProviders();// 清除
//})

{
  "Logging": {
    "LogLevel": {
      "Default": "Trace",
      "Microsoft": "Trace",
      "Microsoft.Hosting.Lifetime": "Trace"
    }
  }
}

public IActionResult CreateOrder(dynamic order)
{
    _logger.LogTrace("Enter CreateOrder method");
    
    _logger.LogDebug("Start creating order: {0}", "order info");

    _logger.LogTrace("Start executing _orderService.Create method");

    if (order.amount <= 0)
    {
        _logger.LogWarning("Order Amount is:{0}");
    }

    _orderService.Create(order);
    _logger.LogTrace("Completed executing _orderService.Crete method");

    _logger.LogTrace("Leave CreateOrder Successfully");

    _logger.LogInformation("Leave CreateOrder Successfully");

    return Ok();
}