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通过构造函数为带有azure函数2.x的http触发器函数注入ilogger

azure-functions azure

Pingpong · 技术社区 · 5 年前

ILogger 可以注入函数参数,如 Token 方法如下。

但是,在将其注入构造函数参数时发生以下错误 log .

[2019年3月7日17:15:17]执行“令牌”(失败, ID=4E22B21F-97F0-4AB4-8F51-8651B 09AEDC8)[2019年3月7日17:15:17] Microsoft.Extensions.DependencyInjection.Abstractions:无法正在解析“Microsoft.Extensions.Logging.iLogger”类型的服务试图激活“功能”。

逃避者 可以注射到 令牌 下面是函数参数。但是上面的错误是在它被注入构造函数参数时发生的 日志 .

public class Functions
{
    private HttpClient _httpClient;
    private IAppSettings _appSettings;
    private ILogger _log;

    public Functions(HttpClient httpClient, IAppSettings appSettings  //working for these two
      , ILogger log  //not working, errors
    )
    {

        _log = log;
    }

    [FunctionName("Token")]
    public async Task<IActionResult> Token(
        [HttpTrigger(AuthorizationLevel.Anonymous, "post", Route = "Token")]
        HttpRequest httpRequest,
        ILogger log)
    {

    }
}

下面的依赖注入

[assembly: WebJobsStartup(typeof(Startup))]
namespace MyApp
{
    public class Startup : IWebJobsStartup
    {
        public void Configure(IWebJobsBuilder builder)
        {
            builder.Services.AddHttpClient();
            builder.Services.AddTransient<IAppSettings, AppSettings>();     
             //builder.Services.AddLogging();  //not working
           //builder.Services.AddSingleton<ILogger>() //not working
        }
}

视觉工作室2017

0 回复 | 直到 5 年前

Kzryzstof 5 年前

我也有这个问题。我打电话就把它修好了 AddLogging() :

[assembly: WebJobsStartup(typeof(Startup))]
namespace MyApp
{
    public class Startup : IWebJobsStartup
    {
        public void Configure(IWebJobsBuilder builder)
        {
            builder.Services.AddHttpClient();
            builder.Services.AddTransient<IAppSettings, AppSettings>();     
            builder.Services.AddLogging();
        }
}

然后,在azure函数中,我必须通过 ILoggerFactory 而不是 ILogger 得到 逃避者 来自的实例 loggerFactory :

public class Functions
{
    private HttpClient _httpClient;
    private IAppSettings _appSettings;
    private ILogger _log;

    public Functions(HttpClient httpClient, IAppSettings appSettings, ILoggerFactory loggerFactory)
    {
        _log = loggerFactory.CreateLogger<Functions>();
    }

    [FunctionName("Token")]
    public async Task<IActionResult> Token(
        [HttpTrigger(AuthorizationLevel.Anonymous, "post", Route = "Token")]
        HttpRequest httpRequest)
    {
           // No need to keep getting the ILogger from the Run method anymore :)
    }
}

Milen Stefanov 5 年前

打电话 LogCategories.CreateFunctionUserCategory 解决了我的问题。完整示例:

Azure Functions Core Tools (2.7.1158 Commit hash: f2d2a2816e038165826c7409c6d10c0527e8955b)
Function Runtime Version: 2.0.12438.0

创业公司

无需添加 builder.Services.AddLogging(); 它会自动导入到容器中。

using Microsoft.Azure.Functions.Extensions.DependencyInjection;
using Microsoft.Extensions.DependencyInjection;

[assembly: FunctionsStartup(typeof(MyFunctionsNamespace.Startup))]

namespace MyFunctionsNamespace
{
    public class Startup : FunctionsStartup
    {
        public override void Configure(IFunctionsHostBuilder builder)
        {
            builder.Services.AddTransient<IMyService, MyService>();
        }
    }
}

myfunkyFunction.cs

using System.Threading.Tasks;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Extensions.Http;
using Microsoft.Extensions.Logging;

namespace MyFunctionsNamespace
{
    public class MyFunkyFunction
    {
        private readonly IMyService _myService;

        public MyFunkyFunction(IMyService myService)
        {
            _myService = myService;
        }

        [FunctionName("FunkyFunc")]
        public async Task<IActionResult> Run(
            [HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)]
            HttpRequest req
            , ILogger log
        )
        {
            log.LogInformation("C# HTTP trigger function processed a request.");

            _myService.Do();

            return new OkObjectResult("Hello");
        }
    }
}

imyservice.cs公司

任何东西 logcategories.createFunctionUserCategory 会完成任务的。这似乎是一些webjob遗留的需求。

using Microsoft.Azure.WebJobs.Logging;
using Microsoft.Extensions.Logging;

namespace MyFunctionsNamespace
{
    public interface IMyService
    {
        void Do();
    }


    public class MyService : IMyService
    {
        private readonly ILogger _log;

        public MyService(ILoggerFactory loggerFactory)
        {
            // Important: Call CreateFunctionUserCategory, otherwise log entries might be filtered out
            // I guess it comes from Microsoft.Azure.WebJobs.Logging
            _log = loggerFactory.CreateLogger(LogCategories.CreateFunctionUserCategory("Common"));
        }

        public void Do()
        {
            _log.Log(LogLevel.Information, "Hello from MyService");
        }
    }
}