如何在没有 DI 的类库中使用 ILogger<Class>

Posted 2023-04-13

【中文标题】如何在没有 DI 的类库中使用 ILogger<Class>

【英文标题】：How to use ILogger<Class> in a Class Library without DI

【发布时间】：2022-01-09 15:33:20

【问题描述】：

我有一个类库和一个使用 Serilog 的测试集成示例应用程序。如何将记录器添加到类库中？我更喜欢Microsoft.Extensions.Logging，但我找不到不依赖注入的方法。

示例

using System.Reactive.Disposables;
using Ardalis.GuardClauses;
using Binance.WebSocket.Client.Extensions;
using Binance.WebSocket.Client.Subscriptions;
using Serilog;
using Serilog.Events;
using Serilog.Sinks.SystemConsole.Themes;

namespace Binance.WebSocket.Client.Sample;

public class Program

    private static readonly ManualResetEvent ExitEvent = new(false);

    private static async Task Main()
    
        Log.Logger = new LoggerConfiguration()
            .MinimumLevel.Verbose()
            .Enrich.FromLogContext()
            .WriteTo.Console(LogEventLevel.Debug, theme: SystemConsoleTheme.Colored)
            .WriteTo.File(Path.Combine("logs", "verbose.log"), rollingInterval: RollingInterval.Day)
            .CreateLogger();

        var disposable = new CompositeDisposable();
        var uri = new Uri("wss://stream.binance.com:9443");

        using var communicator = new BinanceWebSocketCommunicator(uri);

        communicator.Name = "Binance-Spot";
        communicator.ReconnectTimeout = TimeSpan.FromMinutes(10);

        communicator.ReconnectionHappened
            .Subscribe(info => Log.Information($"Reconnection happened, type: info.Type"))
            .DisposeWith(disposable);

        communicator.DisconnectionHappened
            .Subscribe(info => Log.Information($"Disconnection happened, type: info.Type"))
            .DisposeWith(disposable);

        using var client = new BinanceWebSocketClient(communicator);

        client.Streams.PongStream
            .Subscribe(x => Log.Information($"Pong received (x.Message)"))
            .DisposeWith(disposable);

        client.Streams.AggregateTradesStream
            .Subscribe(response =>
            
                Guard.Against.Null(response, nameof(response));
                Guard.Against.Null(response.Data, nameof(response.Data),
                    "Something went wrong and the aggregated trade object is null");

                var trade = response.Data;
                Log.Information($"Aggregated trade [trade.Symbol] [trade.Side] " +
                                $"Price: trade.Price Size: trade.Quantity");
            )
            .DisposeWith(disposable);

        client.Streams.KlineStream
            .Subscribe(response =>
            
                Guard.Against.Null(response, nameof(response));
                Guard.Against.Null(response.Data, nameof(response.Data),
                    "Something went wrong and the kline object is null");
                Guard.Against.Null(response.Data.Data, nameof(response.Data.Data),
                    "Something went wrong and the kline data object is null");

                var kline = response.Data;
                var klineData = response.Data.Data;

                Log.Information($"Kline [kline.Symbol] " +
                                $"Kline start time: klineData.StartTime " +
                                $"Kline close time: klineData.CloseTime " +
                                $"Interval: klineData.Interval " +
                                $"First trade ID: klineData.FirstTradeId " +
                                $"Last trade ID: klineData.LastTradeId " +
                                $"Open price: klineData.OpenPrice " +
                                $"Close price: klineData.ClosePrice " +
                                $"High price: klineData.HighPrice " +
                                $"Low price: klineData.LowPrice " +
                                $"Base asset volume: klineData.BaseAssetVolume " +
                                $"Number of trades: klineData.NumberTrades " +
                                $"Is this kline closed?: klineData.IsClosed " +
                                $"Quote asset volume: klineData.QuoteAssetVolume " +
                                $"Taker buy base: klineData.TakerBuyBaseAssetVolume " +
                                $"Taker buy quote: klineData.TakerBuyQuoteAssetVolume " +
                                $"Ignore: klineData.Ignore ");
            )
            .DisposeWith(disposable);

        client.AddSubscription(
            new AggregateTradeSubscription("bnbusdt"),
            new KlineSubscription("btcusdt", "1h"));

        await communicator.Start().ConfigureAwait(false);

        ExitEvent.WaitOne();
 
        disposable.Dispose();

        Log.CloseAndFlush();
    

【问题讨论】：

您显示的代码不是库代码。我真的不明白该代码与登录库的问题有何关系。

【参考方案1】：

你可以像下面这样使用 LoggerFactory

using var loggerFactory = LoggerFactory.Create(builder =>

    builder
        .AddFilter("Microsoft", LogLevel.Warning)
        .AddFilter("System", LogLevel.Warning)
        .AddFilter("LoggingConsoleApp.Program", LogLevel.Debug)
        .AddConsole()
        .AddEventLog();
);

ILogger logger = loggerFactory.CreateLogger<Program>();
logger.LogInformation("Example log message");

参考： https://docs.microsoft.com/en-us/aspnet/core/fundamentals/logging/?view=aspnetcore-5.0#non-host-console-app

【讨论】：

感谢您的回答！我如何使用Serilog 和LoggerFactory tho？

引用nuget.org/packages/Serilog.Extensions.Logging后可以使用Serilog库.AddSerilog(serilog);提供的扩展方法

谢谢！它起作用了，但是现在我必须想办法将它传递给类库，就像这里的人所做的那样github.com/JKorf/CryptoExchange.Net/blob/…