Log

1. 默認(rèn)自帶log >>>Program

WebHost.CreateDefaultBuilder()中做了默認(rèn)配置

CreateDefualtBuilder

2. Log API
   ASP .NET Core 提供了一套Log API, 它可以各種各樣的Log提供商配合使用. http://www.cnblogs.com/cgzl/p/9019314.html
   內(nèi)置6個Log提供商:

• Console
• Debug
• EventSource
• EventLog
• TraceSource
• Azure App Service
  第三方提供商：
• Nlog
• Serilog

ILogger接口

1. 創(chuàng)建ILogger的時候指明分類，分類名約定是調(diào)用類的全名(string) PostController例如：
   依賴注入ILogger<TCategoryName>
   
   ILogger
   
   
   調(diào)用
   
   
   OK
2. 在ILoggerFactory 上調(diào)用CreateLogger方法時可以指定分類的名稱.

[Route("api/posts")]
    public class PostController : Controller
    {
        private readonly IPostRepository _postRepository;
        private readonly IUnitOfWork _unitOfWork;
        private readonly ILogger _logger;

        public PostController(
            IPostRepository postRepository,
            IUnitOfWork unitOfWork,
            ILoggerFactory loggerFactory)
        {
            _postRepository = postRepository;
            _unitOfWork = unitOfWork;
            _logger = loggerFactory.CreateLogger("Blog.Api.Controllers.PostController");
        }

        [HttpGet]
        public async Task<IActionResult> Get()
        {
            var posts = await _postRepository.GetAllPostsAsync();
            _logger.LogError("Get All Posts ......");
            return Ok(posts);
        }

ILogger其他

1. 級別
   • LogTrace(), 0惧眠，記錄追蹤信息
   • LogDebug(), 1趁矾，記錄調(diào)試信息
   • LogInformation(), 2纽门，記錄信息性的事情
   • LogWarning(), 3，記錄警告信息
   • LogError(), 4煤惩，記錄異常
   • LogCritical(), 5辑舷，用來記錄嚴(yán)重的事情
2. Event ID
3. 信息模板
4. 異常
5. 過濾
6. 作用范圍
   ……

LogError

添加Serilog

1. 安裝包
   Install-Package Serilog
Install-Package Serilog.AspNetCore
   Sinks日志輸出媒介(控制臺、文件蔓搞、sqlserver等）
   Install-Package Serilog.Sinks.Console
Install-Package Serilog.Sinks.File
   …
2. Main()中配置

public static void Main(string[] args)
        {
            //配置Serilog
            Log.Logger = new LoggerConfiguration()
                //最低輸出級別為Debug
                .MinimumLevel.Debug()
                //以Microsoft開頭的特殊,調(diào)整最小級別為Information
                .MinimumLevel.Override("Microsoft", LogEventLevel.Information) 
                .Enrich.FromLogContext()
                .WriteTo.Console() 
                .WriteTo.File(Path.Combine("logs", @"log.txt"), rollingInterval: RollingInterval.Day)
                .CreateLogger();

            var host = CreateWebHostBuilder(args).Build();

            //種子文件
            using (var scope = host.Services.CreateScope())
            {
                var services = scope.ServiceProvider;
                var loggerFactory = services.GetRequiredService<ILoggerFactory>();
                try
                {
                    var applicationContext = services.GetRequiredService<ApplicationContext>();
                    //調(diào)用方法創(chuàng)建種子數(shù)據(jù)
                    Seed.SeedAsync(applicationContext, loggerFactory).Wait();
                }
                catch (Exception e) 
                {
                    var logger = loggerFactory.CreateLogger<Program>();
                    logger.LogError(e, "Error occured seeding the Database.");
                }
            }

            host.Run();
        }

        public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
            WebHost.CreateDefaultBuilder(args)
                //.UseStartup<Startup>();
                .UseStartup(typeof(StartupDevelopment).GetTypeInfo().Assembly.FullName)
                .UseSerilog(); //調(diào)用Serilog,覆蓋掉CreateDefaultBuilder中的默認(rèn)配置        
    }

Console

File