LogStudy/LogStudy.WebApp/Startup.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using Microsoft.Extensions.Logging.Abstractions;
using Microsoft.Extensions.Logging.Configuration;
using Microsoft.Extensions.Logging.Console;
using System.IO;

namespace LogStudy.WebApp
{
    /// <summary>
    /// 使用日志：
    /// 1、构造函数注入
    /// 2、使用 LoggerFactory 来创建 ILogger
    /// </summary>
    public class Startup
    {
        /// <summary>
        /// 构建函数注入
        /// </summary>
        private readonly ILogger _logger;

        /// <summary>
        /// 工厂方法创建
        /// </summary>
        private readonly ILogger _logger2;
        public Startup(IConfiguration configuration,ILogger<Startup> logger)
        {
            Configuration = configuration;
            _logger=logger;
            _logger2=GetLoggerFromFactory("Startup");
        }

        public IConfiguration Configuration { get; }

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            _logger.LogInformation("配置服务开始");
            services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);

            _logger2.LogInformation("配置服务结束");
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IHostingEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }

            app.UseMvc();
        }

        private ILogger GetLoggerFromFactory(string name)
        {
            var fac=new LoggerFactory();

           var logger = fac.AddConsole().CreateLogger(name);

           return logger;
        } 
    }
}