for-lambda.md

https://www.rokrode.com/2021-10-09-logging-in-net-core-console/

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net6.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.Extensions.Configuration" Version="6.0.1" />
    <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="6.0.0" />
    <PackageReference Include="Microsoft.Extensions.Logging" Version="6.0.0" />
    <PackageReference Include="Microsoft.Extensions.Logging.Configuration" Version="6.0.0" />
    <PackageReference Include="Microsoft.Extensions.Logging.Console" Version="6.0.0" />
  </ItemGroup>

  <ItemGroup>
    <None Update="appSettings.json">
      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
    </None>
  </ItemGroup>

</Project>

// See https://aka.ms/new-console-template for more information
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Logging;

Console.WriteLine("Hello, World!");
ConfigurationManager configurationManager = new ConfigurationManager();
//configurationManager.SetBasePath(Directory.GetCurrentDirectory());
configurationManager.AddJsonFile("appSettings.json");

using var loggerFactory = LoggerFactory.Create(builder =>
{
    var loggingConfig = configurationManager.GetSection("Logging");
    builder.AddConfiguration(loggingConfig);
    builder.AddSimpleConsole(options =>
   {
       options.SingleLine = true;
   });
});


Console.WriteLine(configurationManager["Logging:LogLevel:Default"]);
Console.WriteLine(configurationManager.GetSection("Logging:LogLevel").GetChildren().Count());
var builder = configurationManager as IConfigurationBuilder;
var root = builder.Build();
Console.WriteLine(root["Logging:LogLevel:Default"]);

var serviceLogger = loggerFactory.CreateLogger("Demo.Service");
serviceLogger.LogInformation("This is service log");

var customerLogger = loggerFactory.CreateLogger("Demo.Customer");
customerLogger.LogInformation("This is customer log");

{
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft.AspNetCore": "Warning",
      "Demo.Service": "Information",
      "Demo.Customer": "Information"
    }
  },
  "AllowedHosts": "*"
}