c# – 在控制台应用程序中注入ILoggerFactory与在asp.net核心1.1中实例化一个

我使用asp.net core 1.1整理了一个简单的Console应用程序.

我设置了Kestrel托管并使用了我注入的Configure方法

IApplicationBuilder和ILoggerFactory.

我在loggerFactory上调用AddConsole扩展.

然后我运行最简单的中间件,输出一条消息.

应用程序代码如下所示:

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Logging;

namespace DemoILoggerFactory
{
    public class Program
    {
        public static void Main(string[] args)
        {
            var host = new WebHostBuilder()
                .UseKestrel()
                .UseStartup<Program>()
                .Build();
            host.Run();
        }

        public void Configure(IApplicationBuilder app, ILoggerFactory loggerFactory)
        {
            loggerFactory.AddConsole();
            app.Run( async context => {
                await context.Response.WriteAsync("Message ..");
            });
        }
    }
}

当我运行应用程序时,我在控制台中获得以下输出:

Hosting environment: QQ
Content root path: F:\REPOS CORE     1.0.0\LOGGING\DemoILoggerFactory\src\DemoILoggerFactory\bin\Debug\netcoreapp1.0
Now listening on: http://localhost:5000
Application started. Press Ctrl+C to shut down.

访问“locahost:5000”后,控制台中会显示以下日志信息:

info: Microsoft.AspNetCore.Hosting.Internal.WebHost[1]
      Request starting HTTP/1.1 GET http://localhost:5000/
info: Microsoft.AspNetCore.Hosting.Internal.WebHost[2]
      Request finished in 125.5854ms 200
info: Microsoft.AspNetCore.Hosting.Internal.WebHost[1]
      Request starting HTTP/1.1 GET http://localhost:5000/favicon.ico
info: Microsoft.AspNetCore.Hosting.Internal.WebHost[2]
      Request finished in 0.9471ms 200

后来我从Configure参数中删除了ILoggerFactory,并在Configure方法中实例化了一个.唯一的区别是Configure方法的签名和LoggerFactory的即时消息.修改后的代码如下所示:

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Logging;

namespace DemoILoggerFactory
{
    public class Program
    {
        public static void Main(string[] args)
        {
            var host = new WebHostBuilder()
                .UseKestrel()
                .UseStartup<Program>()
                .Build();
            host.Run();
        }

        public void Configure(IApplicationBuilder app)
        {
            ILoggerFactory loggerFactory = new LoggerFactory();
            loggerFactory.AddConsole();
            app.Run( async context => {
                await context.Response.WriteAsync("Message ..");
            });
        }
    }
}

现在,运行应用程序,在访问localhost:5000之前,控制台窗口中显示以下信息:

Hosting environment: QQ
Content root path: F:\REPOS CORE 1.0.0\LOGGING\DemoILoggerFactory\src\DemoILoggerFactory\bin\Debug\netcoreapp1.0
Now listening on: http://localhost:5000
Application started. Press Ctrl+C to shut down.

在我重新访问“localhost:5000”后,控制台中不会显示其他请求日志.

对于这两种情况,Project.json文件如下:

{
  "version": "1.0.0-*",
  "buildOptions": {
    "emitEntryPoint": true
  },

  "dependencies": {
    "Microsoft.NETCore.App": {
      "type": "platform",
      "version": "1.1.0"
    },
    "Microsoft.AspNetCore.Hosting": "1.1.0",
    "Microsoft.AspNetCore.Server.Kestrel": "1.1.0",
    "Microsoft.Extensions.Logging": "1.1.0",
    "Microsoft.Extensions.Logging.Console": "1.1.0",
    "Microsoft.AspNetCore.Http": "1.1.0"
  },

  "frameworks": {
    "netcoreapp1.1": {
      "imports": "dnxcore50"
    }
  }
}

我错过了什么?
为什么两个“LoggerFactory”实例的行为不同?

最佳答案 在编写这个
ASP.NET Core Logging Tutorial时我的经历完全相同.深入研究代码表明,Kestrel还依赖于Microsoft.Extensions.Logging.启动时,Kestrel将一个记录器添加到ASP.NET Core初始化的ILoggerFactory中.记录器记录有关Kestrel内部的大量数据,有关TCP连接,HTTP请求等的信息.如果降低Microsoft.AspNetCore.Server.Kestrel记录器类别的最低级别,您将看到来自Kestrel的更多日志消息.此外,如果您在调试器中检查ASP.NET Core提供的ILoggerFactory,您将看到Kestrel记录器,这是您自己创建的记录器中没有的.

虽然您可以通过手动创建KestrelTrace来配置来自Kestrel的相同数量的日志消息,但我认为您最好使用ASP.NET Core提供的ILoggerFactory.至少那是我的结论:)

点赞