c# - .Net Core 控制台日志记录未出现

Question

找到这个 article在 .Net 上登录控制台应用程序，但它对我不起作用。示例日志未出现在控制台中。

我正在使用最新的日志包

引用资料

  <ItemGroup>
    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="3.1.7" />
    <PackageReference Include="Microsoft.Extensions.Logging" Version="3.1.7" />
    <PackageReference Include="Microsoft.Extensions.Logging.Console" Version="3.1.7" />
  </ItemGroup>

代码

using System;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;

class Program
{
    static void Main(string[] args)
    {
        // instantiate DI and configure logger
        var serviceProvider = new ServiceCollection()
            .AddLogging(cfg => cfg.AddConsole())
            .AddTransient<Program>()
            .Configure<LoggerFilterOptions>(cfg => cfg.MinLevel = LogLevel.Information)
            .BuildServiceProvider();
        // get instance of logger
        var logger = serviceProvider.GetService<ILogger<Program>>();
        // use the logger
        logger.LogInformation("Woo Hooo");
    }
}

Answer 1

您的配置是正确的，提供者只是没有足够的时间在您退出主线程之前刷新输出:

using System;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;

class Program
{
    static void Main(string[] args)
    {
        // instantiate DI and configure logger
        var serviceProvider = new ServiceCollection()
            .AddLogging(cfg => cfg.AddConsole())
            .AddTransient<Program>()
            .Configure<LoggerFilterOptions>(cfg => cfg.MinLevel = LogLevel.Information)
            .BuildServiceProvider();
        // get instance of logger
        var logger = serviceProvider.GetService<ILogger<Program>>();
        logger.LogInformation("Woo Hooo");

        // This will allow enough time to flush
        Console.ReadLine();
    }
}

此外，我认为您不需要 .AddTransient<Program>()除非你打算创建多个 Program实例。