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I'm migrating a console app from .NET Legacy to .NET Core 2.2. In that app, I'm using the HttpClient and HttpRequestMessage classes. Sometimes, requests made with these classes fail. For that reason, I had a system.diagnostics block in my App.config file to log the raw request for diagnosing issues. While this worked in my legacy app, I now get an error in .NET Core.
When I start my app, I see the following error:
ConfigurationErrorsException: Unrecognized configuration section system.diagnostics.
The only thing I've added to my App.config file is: <system.diagnostics></system.diagnostics>, which is an empty config block. If I remove that block, my app runs as expected.
How do I add the system.diagnostics configuration used in my legacy app into my .NET Core app so I can trace the raw web requests again?
Thanks!
672
Application configuration in ASP.NET Core is performed using one or more configuration providers. Configuration providers read configuration data from key-value pairs using a variety of configuration sources: Settings files, such as appsettings. json.
ASP.NET Core no longer uses the Global. asax and web. config files that previous versions of ASP.NET utilized.
In order to set up the ASP.NET Core Module correctly, the web. config file must be present at the content root path (typically the app base path) of the deployed app.
The thing is that .NET Core doesn't pre-register config section for system.diagnostics.
Try to emplace this at the beginning of App.config, just under <configuration> line:
<configSections>
<section name="system.diagnostics" type="System.Diagnostics.DiagnosticsConfigurationHandler"/>
</configSections>
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