Aicrosoft.Extensions.Hosting 6.1.5

How to use Aicrosoft.Extensions.Hosting

How to use

1. add pakcage NLog.Extensions.Logging
2. add nlog.config
3. chanage the program code and add extesion of host

Program.cs file

<details> <summary>The Application start</summary>

using Aicrosoft.Logging;
using Microsoft.Extensions.Hosting;
using NLogAIApp;

var start = Environment.TickCount64;
var logger = LogHelper.GetCurrentClassLogger();
logger.Trace($"Loggger was created TimeElapsed:{Environment.TickCount64 - start} ms");

try
{
    start = Environment.TickCount64;
    logger.Trace($"Begin Build Host Envirment ...");
    using IHost host = Host.CreateDefaultBuilder(args)
        .AddAppServices()
        .Build();
    logger.Trace($"End Build. TimeElapsed:{Environment.TickCount64 - start} ms");
    await host.RunAsync();
    return 0;
}
catch (Exception ex)
{
    logger.Error(ex, "Build and run IHost has a exception");
    return -9;
}
finally
{
    LogHelper.Shutdown();
}

</details>

Startup.cs file

<details> <summary>The Application's Startup classs </summary>

using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using NLogAIApp.Options;
using NLogAIApp.Services;
using System.Text;

namespace NLogAIApp;

public class Startup : HostedService
{
    private readonly IHelloWorldService helloWorldService;
    private readonly TasksOption tasksSetting;

    public Startup(
        IHostApplicationLifetime appLifetime, ILoggerFactory loggerFactory, IServiceProvider serviceProvider
        , IHelloWorldService helloService
        , IOptions<TasksOption> options
        ) : base(appLifetime, loggerFactory, serviceProvider)
    {
        helloWorldService = helloService;
        tasksSetting = options.Value;
        Logger.LogDebug($"setting json value is :{tasksSetting.ToJson()}");
    }
   

    public override async Task StartAsync(CancellationToken cancellationToken)
    {
        Logger.LogDebug("1. StartAsync has been called.");

        Console.WriteLine();
        Console.WriteLine("-------> LOGGING DEBUG TESTING BEGIN <--------");
        await helloWorldService.SayHelloAsync();
        Console.WriteLine("-------> LOGGING DEBUG TESTING END <--------");
        Console.WriteLine();

        Console.WriteLine($"------------Configuration demo--------------------");
        var cfg = ServiceProvider.GetRequiredService<IConfiguration>();
        var val1 = cfg.GetValue<int>("Tasks:Interval");
        Console.WriteLine($"cfg.GetValue<int>(\"Tasks:Interval\") = {val1}");
        Console.WriteLine($"-------------------------------------------------");


        //It's stop the application.
        AppLifetime.StopApplication();
    }

    public override async Task StopAsync(CancellationToken cancellationToken)
    {
        Logger.LogDebug("4. StopAsync has been called.");
        await Task.CompletedTask;
        //await _appLifetime.ShutdownAsync();
        return;
    }

}

</details>

ConfigureExtensions.cs file

<details> <summary>The Application's Host Extensions </summary>

using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using NLog.Extensions.Logging;
using NLogAIApp.Options;

namespace NLogAIApp;

internal static class ConfigureExtensions
{

    public static IHostBuilder AddAppServices(this IHostBuilder hostBuilder)
    {
        hostBuilder
            .AddAppSetting()
            .AddServices()
            .AddNLog()
            //.UseAop()
            //.UseAopDI()
            .AddHostedService<Startup>()
            ;

        return hostBuilder;
    }


    /// <summary>
    /// config.json register
    /// </summary>
    /// <param name="hostBuilder"></param>
    public static IHostBuilder AddAppSetting(this IHostBuilder hostBuilder)
    {
        hostBuilder
            //.ConfigureAppConfiguration((hostContext, configuration) =>
            //{
            //    //configuration.Sources.Clear(); //在CreateDefaultBuilder(args)时如果有参数会被清除
            //    //configuration.AddCommandLine(args);
            //    var env = hostContext.HostingEnvironment;
            //    configuration
            //        .AddJsonFile("./appsettings.json")
            //        .AddJsonFile($"./appsettings.{env.EnvironmentName}.json", true, true);
            //})
            .ConfigureServices((hostContext, services) =>
            {
                var config = hostContext.Configuration;
                services.Configure<TasksOption>(config.GetSection(TasksOption.SectionName));

                // 可以直接取得上面配置的值
                var tasksOption = config.GetSection(TasksOption.SectionName).Get<TasksOption>();

            });

        return hostBuilder;
    }

}

</details>