c# - 扩展方法中的 ILoggerFactory - 生命周期和处置

Question

创建 ILogger在扩展方法中，我存储了一个 ILoggerFactory在静态类中

public static class ApplicationLogging
{
    public static ILoggerFactory LoggerFactory { get; set; }

    public static ILogger CreateLogger<T>() =>
        LoggerFactory?.CreateLogger<T>();

    public static ILogger CreateLogger(string name) =>
        LoggerFactory?.CreateLogger(name);

}

设置为

public void Configure(ILoggerFactory loggerFactory)
{
   ...
    ApplicationLogging.LoggerFactory = loggerFactory;
}

但是，我注意到 ILoggerFactory被处置

System.ObjectDisposedException: Cannot access a disposed object. Object name: 'LoggerFactory'. at Microsoft.Extensions.Logging.LoggerFactory.CreateLogger(String categoryName) at Microsoft.Extensions.Logging.Logger`1..ctor(ILoggerFactory factory) at Microsoft.Extensions.Logging.LoggerFactoryExtensions.CreateLogger[T](ILoggerFactory factory)

那么存储一个ILoggerFactory是不是不对呢？ ？从扩展方法访问它的替代方法是什么？店铺 IServiceProvider和 GetRequiredService<ILoggerFactory> ？

Answer 1

ILoggerFactory 默认不会添加到 DI 容器中。您应该使用提供的 AddLogging() 扩展方法注册它。

public void ConfigureServices(IServiceCollection services)
{
    ...
    services.AddLogging()
}

内部简单地做

services.TryAdd(ServiceDescriptor.Singleton<ILoggerFactory, LoggerFactory>());

---

无论如何，正如其他评论所说 - 尽量使用内置的 DI 容器而不是自己的静态类来解决依赖关系。