Bug 33375 - System.Configuration does not throw expected ConfigurationErrorsException when App.Config file or override config file contains invalid XML
Summary: System.Configuration does not throw expected ConfigurationErrorsException whe...
Status: NEW
Alias: None
Product: Class Libraries
Classification: Mono
Component: System.Configuration ()
Version: master
Hardware: PC Windows
: --- normal
Target Milestone: Untriaged
Assignee: Bugzilla
Depends on:
Reported: 2015-08-25 17:53 UTC by Chris Sano
Modified: 2015-08-25 17:53 UTC (History)
1 user (show)

Is this bug a regression?: ---
Last known good build:

Sample solution showing how when override config has invalid chars, default is used instead of exception being thrown (40.94 KB, application/x-zip-compressed)
2015-08-25 17:53 UTC, Chris Sano

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Description Chris Sano 2015-08-25 17:53:49 UTC
Created attachment 12640 [details]
Sample solution showing how when override config has invalid chars, default is used instead of exception being thrown

When the App.config file and/or its override file contains invalid XML, the expected ConfigurationErrorsException is not thrown.

This caused problems for us when in our scenario, the override XML contained a nil bit, and on Mono 4.2 on OS X 10.11 (this repros on 10.10.5 as well, so I'm assuming this isn't OS specific), the override key/value pair was ignored, and the original value was instead used. No exception was thrown.

On Windows, an exception is thrown immediately on startup.

When the App.config file contains an invalid XML, such as in the case of the nil bit, Mono ignores it and still uses the configuration value.

The expected behavior here is that some kind of XML validation occurs.