如何使用ConsoleLoggerProvider创建LoggerFactory？ [英] How to create a LoggerFactory with a ConsoleLoggerProvider?

问题描述

ConsoleLoggerProvider 具有四个构造函数：

1. ConsoleLoggerProvider（IConsoleLoggerSettings）


2. ConsoleLoggerProvider（IOptionsMonitor< ConsoleLoggerOptions>）


3. ConsoleLoggerProvider（Func< String，LogLevel，Boolean> ;,布尔）


4. ConsoleLoggerProvider（Func< String，LogLevel，Boolean> ;,布尔，布尔）

1. ConsoleLoggerProvider(IConsoleLoggerSettings)
2. ConsoleLoggerProvider(IOptionsMonitor<ConsoleLoggerOptions>)
3. ConsoleLoggerProvider(Func<String,LogLevel,Boolean>, Boolean)
4. ConsoleLoggerProvider(Func<String,LogLevel,Boolean>, Boolean, Boolean)

其中三个已被废弃，并显示以下消息：

Three of them are declared obsolete with this message:

此方法已过时，将在以后的版本中删除。推荐的替代方法是使用LoggerFactory配置过滤，并使用ConsoleLoggerOptions配置日志记录选项。

This method is obsolete and will be removed in a future version. The recommended alternative is using LoggerFactory to configure filtering and ConsoleLoggerOptions to configure logging options.

使用构造函数＃3，创建<$ c $带有 ConsoleLoggerProvider 的c> LoggerFactory 很简单（如实体框架核心-记录）：

With constructor #3, creating a LoggerFactory with a ConsoleLoggerProvider is straightforward (as documented on Entity Framework Core - Logging):

var loggerFactory = new LoggerFactory(new[] { new ConsoleLoggerProvider((category, level) => level >= LogLevel.Information, true) });

但是由于已弃用，我们只剩下构造函数2。这是我发现的等效项：

But since it's deprecated, we are left with constructor #2. Here's what I found to be equivalent:

var configureNamedOptions = new ConfigureNamedOptions<ConsoleLoggerOptions>("", null);
var optionsFactory = new OptionsFactory<ConsoleLoggerOptions>(new []{ configureNamedOptions }, Enumerable.Empty<IPostConfigureOptions<ConsoleLoggerOptions>>());
var optionsMonitor = new OptionsMonitor<ConsoleLoggerOptions>(optionsFactory, Enumerable.Empty<IOptionsChangeTokenSource<ConsoleLoggerOptions>>(), new OptionsCache<ConsoleLoggerOptions>());
var loggerFactory = new LoggerFactory(new[] { new ConsoleLoggerProvider(optionsMonitor) }, new LoggerFilterOptions { MinLevel = LogLevel.Information });

这似乎过于复杂，我是否缺少简单的东西？

This seems overly complicated, am I missing something simpler?

推荐答案

在.NET Core 2.2中，您可以构建 ILoggerFactory ，而无需通过Microsoft的依赖项注入框架使用过时的方法。它比手动构建所有内容的版本要复杂一些。方法如下：

In .NET Core 2.2, you can build an ILoggerFactory without using obsolete methods through Microsoft's dependency injection framework. It's a little less verbose than the version where everything is constructed by hand. Here’s how:

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

IServiceCollection serviceCollection = new ServiceCollection();
serviceCollection.AddLogging(builder => builder
    .AddConsole()
    .AddFilter(level => level >= LogLevel.Information)
);
var loggerFactory = serviceCollection.BuildServiceProvider().GetService<ILoggerFactory>();

在.NET Core 3.0中，您可以使用 LoggerFactory.Create ：

And in .NET Core 3.0, you can use LoggerFactory.Create:

var loggerFactory = LoggerFactory.Create(builder => {
        builder.AddFilter("Microsoft", LogLevel.Warning)
               .AddFilter("System", LogLevel.Warning)
               .AddFilter("SampleApp.Program", LogLevel.Debug)
               .AddConsole();
    }
);

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