ConfigurationManager.AppSettings is read-only #11751
Description
Steps to Reproduce
- ConfigurationManager.AppSettings.Set("test", "value")
Current Behavior
Throws System.NotSupportedException: Collection is read-only.
Expected Behavior
This works with .NET Framework.
cf. https://docs.microsoft.com/en-us/dotnet/api/system.configuration.configurationmanager.appsettings?view=netframework-4.7.2
On which platforms did you notice this
[ x] macOS
[ ] Linux
[ ] Windows
Version Used:
5.12.0.309
Stacktrace
System.NotSupportedException: Collection is read-only.
at System.Collections.Specialized.NameValueCollection.Set (System.String name, System.String value) [0x00008] in /Users/builder/jenkins/workspace/build-package-osx-mono/2018-02/external/bockbuild/builds/mono-x64/mcs/class/referencesource/System/compmod/system/collections/specialized/namevaluecollection.cs:310
at System.Collections.Specialized.NameValueCollection.set_Item (System.String name, System.String value) [0x00000] in /Users/builder/jenkins/workspace/build-package-osx-mono/2018-02/external/bockbuild/builds/mono-x64/mcs/class/referencesource/System/compmod/system/collections/specialized/namevaluecollection.cs:337