如何在ILogger MVC 6中注册注入ASP.NET

Question

我有一个ASP.NET MVC 6 (beta-4)应用程序。

public void ConfigureServices(IServiceCollection services)
{
    // Logging
    services.AddLogging();

    // ...
}

public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerfactory)
{
    // Add the console logger.
    loggerfactory.AddConsole(minLevel: LogLevel.Warning);

    // ...
}

我有个控制器..。

public class HomeController : 
    Controller
{
    ILogger _logger;

    public HomeController(ILogger logger) 
    {
        _logger = logger;
    }

    // ...
}

但是当我没有得到正确注册的服务时：InvalidOperationException: Unable to resolve service for type 'Microsoft.Framework.Logging.ILogger' while attempting to activate 'HomeController'.。我登记记录器有什么问题吗？

Answer 1

我以为services.AddLogging();做了正确的事情并注册了ILogger。在查看了源代码(https://github.com/aspnet/Logging/blob/d874c5726e713d3eb34938f85faf7be61aae0f2a/src/Microsoft.Framework.Logging/LoggingServiceCollectionExtensions.cs)之后，我发现它实际上是在注册ILogger<>。将ILogger的签名更改为ILogger<HomeController>使上述示例工作。

public class HomeController : 
    Controller
{
    ILogger<HomeController> _logger;

    public HomeController(ILogger<HomeController> logger) 
    {
        _logger = logger;
    }

    // ...
}

感谢史蒂夫让我走上了正确的轨道找到了这个。

Answer 2

services.AddLogging();不适合我，所以我将这两条语句添加到ConfigureServices中

services.AddSingleton<ILoggerFactory, LoggerFactory>();
services.AddSingleton(typeof(ILogger<>), typeof(Logger<>));

现在DI容器是愉快的，一切都正常。

Answer 3

可以将以下行添加到ConfigureServices()方法中：

services.AddTransient<ILogger>(s => s.GetService<ILogger<Program>>());