c# - .Net core 2.0 控制台应用程序的日志记录和配置？

Question

以下代码出现错误。为 .Net Core 2.0 控制台应用程序设置日志记录和配置管理的正确方法是什么？

Error CS1061 'LoggerFactory' does not contain a definition for 'AddConsole' and no extension method 'AddConsole' accepting a first argument of type 'LoggerFactory' could be found (are you missing a using directive or an assembly reference?)

Error CS1503 Argument 2: cannot convert from 'Microsoft.Extensions.Configuration.IConfigurationSection' to 'System.Action'

class Program
{
    static void Main(string[] args)
    {
        var services = new ServiceCollection();
        ConfigureServices(services);
        var serviceProvider = services.BuildServiceProvider();
        var app = serviceProvider.GetService<Application>();
        Task.Run(() => app.Run()).Wait();
    }

    private static void ConfigureServices(IServiceCollection services)
    {
        ILoggerFactory loggerFactory = new LoggerFactory()
            .AddConsole() // Error!
            .AddDebug();

        services.AddSingleton(loggerFactory); // Add first my already configured instance
        services.AddLogging(); // Allow ILogger<T>

        IConfigurationRoot configuration = GetConfiguration();
        services.AddSingleton<IConfigurationRoot>(configuration);

        // Support typed Options
        services.AddOptions();
        services.Configure<MyOptions>(configuration.GetSection("MyOptions")); // Error!

        services.AddTransient<Application>();
    }

    private static IConfigurationRoot GetConfiguration()
    {
        return new ConfigurationBuilder().SetBasePath(Directory.GetCurrentDirectory()).AddXmlFile("App.config", optional: true).Build();
    }

    public class MyOptions
    {
        public string Name { get; set; }
    }

    public class Application
    {
        ILogger _logger;
        MyOptions _settings;

        public Application(ILogger<Application> logger, IOptions<MyOptions> settings)
        {
            _logger = logger;
            _settings = settings.Value;
        }

        public async Task Run()
        {
            try
            {
                _logger.LogInformation($"This is a console application for {_settings.Name}");
            }
            catch (Exception ex)
            {
                _logger.LogError(ex.ToString());
            }
        }
    }
}

Answer 1

看起来您可能缺少一些依赖项:

1. Microsoft.Extensions.Logging.Console ，它提供了 AddConsole扩展方法。
2. Microsoft.Extensions.Options.ConfigurationExtensions ，它提供了 Configure<T>您似乎缺少扩展方法。

在 .NET Core 可执行文件中配置服务方面，Andrew Lock 有一个 post关于 .NET Core 的第一个版本的主题。随着 .NET Core 2 最近的到来，其中一些内容可能已经过时，但值得一读。