Azure Functions中的Serilog

问题描述

Azure Functions中的每个方法都可以将Microsoft.Extensions.Logging.ILogger插入其中以进行日志记录.将WebJobsStartup与启动类一起使用，您可以使用以下语法将日志记录更改为使用Serilog:

Each method in Azure Functions can have a Microsoft.Extensions.Logging.ILogger injected into it for logging. Using WebJobsStartup with a startup class you can change the logging to use Serilog using the following syntax:

[assembly: WebJobsStartup(typeof(Startup))]
namespace MyFuncApp {
    public class Startup : IWebJobsStartup
    {
        public void Configure(IWebJobsBuilder builder)
        {
            builder.Services.AddLogging(
                lb => lb.ClearProviders()
                    .AddSerilog(
                        new LoggerConfiguration()
                            .Enrich.FromLogContext()
                            .WriteTo.Console()
                            .WriteTo.File(@"C:\Temp\MyFuncApp.log")
                            .CreateLogger(),
                        true));
        }
    }
}

我还可以将其他对象添加到DI中，并使用builder.Services.AddSingleton<IMyInterface, MyImplementation>();

I can also add other objects to the DI and inject them either into the methods or into the constructor for the class containing the methods using i.e. builder.Services.AddSingleton<IMyInterface, MyImplementation>();

但是，我非常希望能够以相同的方式注入Microsoft.Extensions.Logging.ILogger，但是如果我尝试在构造函数中使用ILogger，则在方法调用期间会出现以下错误(因为那是当类已创建):

However, I would very much like to be able to inject the Microsoft.Extensions.Logging.ILogger in the same way, but if I try to use the ILogger in the constructor I get the following error during method invokation (as that's when the class is created):

那么，有什么方法可以将ILogger注入这样的类构造函数中吗?

So, is there any way of injecting the ILogger into a class constructor like this?

public class MyFunctions
{
    private IMyInterface _myImpl;
    private ILogger _log;

    public MyFunctions(
        IMyInterface myImplememtation, // This works
        ILogger log) // This does not
    {
        _myImpl = myImplementation;
        _log = log;
        _log.LogInformation("Class constructed");
    }

    public async Task<IActionResult> Function1([HttpTrigger() ... ) {
        _log.LogInformation("Function1 invoked");
    }
}

推荐答案

请尝试以下代码，它对我有效:

Please try the code below, it works at my side:

    [assembly: WebJobsStartup(typeof(Startup))]
    namespace MyApp
 {
        public class Startup : IWebJobsStartup
        {
            public void Configure(IWebJobsBuilder builder)
            {
                //other code

                builder.Services.AddLogging();
            }
        }



    public class Functions
    {
        //other code
        private ILogger _log;

        public Functions(ILoggerFactory loggerFactory)
        {
            _log = loggerFactory.CreateLogger<Functions>();
        }

        [FunctionName("Token")]
        public async Task<IActionResult> Function1(
            [HttpTrigger()]...)
        {
               _log.LogInformation("Function1 invoked");
        }
    }

}

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