问题描述

在Azure App Service的门户上 Log Stream 日志无输出，需要如何操作让其输出Application Logs呢?

如下图所示：

问题解答

请注意，上图中提示说：Application logs are switched off. You can turn them on using the App Service Logs Settings. 应用日志关闭，可以通过App Service Logs 页面来设置开启。

App Service ---> App Service Logs : 针对Application Logging 和 Web Server Logging 为On，最后点击页面上的Save按钮。

保存后，返回Log Stream页面，就可以实时查看App Service中的输出日志：

附录1：.NET API下的日志输出示例

using Microsoft.AspNetCore.Mvc;

namespace myapi01.Controllers
{
    [ApiController]
    [Route("[controller]")]
    public class AASController : ControllerBase
    {
        private readonly ILogger<AASController> _logger;
        public AASController(ILogger<AASController> logger)
        {
            _logger = logger;
        }

        [HttpGet]
        [Route("/log")]
        public string GetLog()
        {
            _logger.LogInformation("this is test massge informaiton level!!!!!!!");

            _logger.LogWarning("this is test massge Warning level!!!!!!!");

            _logger.LogError("this is test massge Error level!!!!!!!");

            _logger.LogDebug("this is test massge debug level!!!!!!!");

            _logger.LogCritical("this is test massge Critical level!!!!!!!");

            _logger.LogTrace("this is test massge Trace level!!!!!!!");

            return "Outpu logs - today 2023-04-18 03:56";
        }

        [HttpGet]
        [Route("/exp")]
        public string Getexception()
        {
            throw new Exception("thsi is my custome exception today.");
        }

    }
}