我在Azure日志流中看不到日志 [英] I cannot see logs in Azure Log Stream

问题描述

我正在尝试记录ASP.NET Core App的信息，但找不到在Azure Log Stream中显示消息的方法.当我在Visual Studio中调试时，该应用程序成功登录，但是发布到Azure时却看不到任何东西.

I am trying to log information of my ASP.NET Core App and I cannot find a way to display the loogs in Azure Log Stream. The application successfully logs when I debug in Visual Studio but I do not see anything when I publish to Azure.

这是我的应用服务日志的样子: 应用服务日志

This is how my App Service Logs looks like: App Service Logs

我尝试使用Microsoft文档中发现的其他方法进行日志记录，但没有一种方法起作用.

I have tried to log using different methods that I have found in Microsoft documentation and none has worked.

    [HttpGet]
    public string Index()
    {
        Trace.TraceInformation("You are in the face recognition controller. Trace");
        _logger.LogInformation("You are in the face recognition controller. Logger");
        return "You are in the face recognition controller";
    }

控制器构造函数:

    private readonly ILogger _logger;
    public FaceRecognitionController(ILoggerFactory loggerFactory)
    {
        _logger = loggerFactory.CreateLogger<FaceRecognitionController>();
    }

配置方法:

public void Configure(IApplicationBuilder app, IWebHostEnvironment env, ILoggerFactory loggerFactory)
    {
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }

        loggerFactory.CreateLogger("console");
        loggerFactory.CreateLogger("debug");

        app.UseHttpsRedirection();

        app.UseRouting();

        app.UseAuthorization();

        app.UseEndpoints(endpoints =>
        {
            endpoints.MapControllers();
        });
    }

有人知道我能做什么吗?

Does anyone know what I can do?

日志流截图: 在此处输入图片描述

推荐答案

对于.NET Core 3.1，请按照以下步骤操作:

For .NET core 3.1, please follow the steps below:

1.安装nuget packagae Microsoft.Extensions.Logging.AzureAppServices，版本3.1.2 和 Microsoft.Extensions.Logging.您的项目的控制台，版本3.1.2 .

1.Install nuget packagae Microsoft.Extensions.Logging.AzureAppServices, Version 3.1.2 and Microsoft.Extensions.Logging.Console, version 3.1.2 for your project.

2.在Startup.cs-> ConfigureServices方法中，添加以下代码:

2.In Startup.cs -> ConfigureServices method, add the following code:

    public void ConfigureServices(IServiceCollection services)
    {
        //other code

        //add the following code
        services.AddLogging(loggingBuilder =>
        {
            loggingBuilder.AddConsole();
            loggingBuilder.AddDebug();
            loggingBuilder.AddAzureWebAppDiagnostics();
        });
    }

然后在控制器类中，代码如下所示:

then in the controller class, code looks like below:

    private readonly ILogger<HomeController> _logger;

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

    public IActionResult Index()
    {
        _logger.LogInformation("**********first: hello, this is a test message!!!");
        _logger.LogInformation("**********second: hello, this is a test message!!!");
        return View();
    }

3.将其发布到Azure，然后按照您的帖子中所述配置"App Service Logs".

3.Publish it to azure, and then configure "App Service Logs" as mentioned in your post.

4.Nav在Azure门户中导航到日志流"，然后访问该网站，您可以看到日志:

4.Nav to "Log stream" in azure portal, then visit the web site, you can see the logs:

注意:您应该始终在asp.net核心中使用ILogger进行日志记录，Trace.TraceInformation可能对此不起作用.

Note: You should always use ILogger in asp.net core for logging, Trace.TraceInformation may not work for it.

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