.net core 日志框架：聊聊记日志的最佳姿势

• .net core 日志框架：聊聊记日志的最佳姿势
  • 必要的依赖包
  • 内容示例
    • 项目架构
    • 内容示例

必要的依赖包

• Microsoft.Extensions.Configuration.Json
• Microsoft.Extensions.Logging
• Microsoft.Extensions.Logging.Console
• Microsoft.Extensions.Logging.Debug
• Microsoft.Extensions.Logging.TraceSource

内容示例

项目架构

内容示例

这里我们对日志程序做配置

appsetting.json

{
  "Logging": {
    "LogLevel": {
      "Default": "Debug",
      "Microsoft": "Warning",
      "Microsoft.Hosting.Lifetime": "Information"
    },
    //下面是针对 Console 的输出提供程序
    "Console": {
      "LogLevel": {
        "Default": "Information",
        "Program": "Trace",
        "alogger": "Trace",
        "LoggingSimpleDemo.OrderService": "None" //None表示关闭日志级别
      }
    }
  }
}

注意
appsetting.json表示对日志的级别定位，具体请参考LogLevel枚举

Program.cs

static void Main(string[] args)
{
    //从文件中读取配置
    IConfigurationBuilder configBuilder = new ConfigurationBuilder();
    configBuilder.AddJsonFile("appsettings.json", optional: false, reloadOnChange: true);
    var config = configBuilder.Build();
    IServiceCollection serviceCollection = new ServiceCollection();
    serviceCollection.AddSingleton<IConfiguration>(p => config); //用工厂模式将配置对象注册到容器管理
    serviceCollection.AddLogging(builder =>
    {
        builder.AddConfiguration(config.GetSection("Logging"));
        builder.AddConsole();
    });
    IServiceProvider service = serviceCollection.BuildServiceProvider();
    ILoggerFactory loggerFactory = service.GetService<ILoggerFactory>();
    var alogger = loggerFactory.CreateLogger("alogger");
    alogger.LogDebug(2001, "aidasi");
    var alogger2 = loggerFactory.CreateLogger("alogger");
    alogger2.LogDebug("aidasi");
    var ex = new Exception("Happen an Error");
    alogger.LogError(ex, "Happen an Error");
    Console.ReadKey();
}

运行结果

一般我们可以通过注入的方式使用日志

OrderService.cs

public class OrderService
{
    ILogger<OrderService> _logger;
    public OrderService(ILogger<OrderService> logger)
    {
        _logger = logger;
    }
    public void Show()
    {
        //内部传递参数（可以节省一定的资源）
        _logger.LogInformation("Show Time {time}",DateTime.Now);
        //拼接字符串（都会去拼接一次）
        _logger.LogInformation($"Show Time {DateTime.Now}");
    }
}

Program.cs

class Program
{
    static void Main(string[] args)
    {
        //从文件中读取配置
        IConfigurationBuilder configBuilder = new ConfigurationBuilder();
        configBuilder.AddJsonFile("appsettings.json", optional: false, reloadOnChange: true);
        var config = configBuilder.Build();
        IServiceCollection serviceCollection = new ServiceCollection();
        serviceCollection.AddSingleton<IConfiguration>(p => config); //用工厂模式将配置对象注册到容器管理
        serviceCollection.AddLogging(builder =>
        {
            builder.AddConfiguration(config.GetSection("Logging"));
            builder.AddConsole();
        });
        serviceCollection.AddTransient<OrderService>();
        IServiceProvider service = serviceCollection.BuildServiceProvider();
        var order = service.GetService<OrderService>();
        order.Show();
        Console.ReadKey();
    }
}

运行结果

我们发现这里什么也没有，因为在配置中我们把"LoggingSimpleDemo.OrderService": "None"
修改appsetting.json为Debug
再次运行