[Mono-dev] Crash in ApplicationSettingsBase if property with SettingsSerializeAs.Xml is set to null

[Justin Cherniak]

Hello everyone,

I cannot really explain the reason behind this bug (I tried probing the
source to no avail), but if you setting a setting on an
ApplicationSettingsBase, if another setting which  the SettingsSerializeAs(
SettingsSerializeAs.Xml) attribute on it is null, the following crash
occurs:

Unhandled Exception: System.ArgumentNullException: Argument cannot be null.
Parameter name: s
 at System.IO.StringReader..ctor (System.String s) [0x00031] in
C:\cygwin\tmp\monobuild\build\BUILD\mono-
1.2.6\mcs\class\corlib\System.IO\StringReader.cs:55
 at (wrapper remoting-invoke-with-check) System.IO.StringReader:.ctor(string)
 at Mono.Xml2.XmlTextReader..ctor (System.String xmlFragment, XmlNodeType
fragType, System.Xml.XmlParserContext context) [0x00000] in
C:\cygwin\tmp\monobuild\build\BUILD\mono-
1.2.6\mcs\class\System.XML\System.Xml\XmlTextReader.cs:166
 at System.Xml.XmlTextReader..ctor (System.String xmlFragment, XmlNodeType
fragType, System.Xml.XmlParserContext context) [0x00006] in
C:\cygwin\tmp\monobuild\build\BUILD\mono-
1.2.6\mcs\class\System.XML\System.Xml\XmlTextReader2.cs:119
 at System.Xml.XmlDocumentFragment.set_InnerXml (System.String value)
[0x00081] in C:\cygwin\tmp\monobuild\build\BUILD\mono-
1.2.6\mcs\class\System.XML\System.Xml\XmlDocumentFragment.cs:69
 at System.Configuration.CustomizableFileSettingsProvider.SaveProperties (
System.Configuration.ExeConfigurationFileMap exeMap,
System.Configuration.SettingsPropertyValueCollection collection,
ConfigurationUserLevel level, System.Configuration.SettingsContext context,
Boolean checkUserLevel) [0x00191] in
C:\cygwin\tmp\monobuild\build\BUILD\mono-
1.2.6\mcs\class\System\System.Configuration\CustomizableFileSettingsProvider.cs:597
 at System.Configuration.CustomizableFileSettingsProvider.SetPropertyValues(
System.Configuration.SettingsContext context,
System.Configuration.SettingsPropertyValueCollection collection) [0x00041]
in C:\cygwin\tmp\monobuild\build\BUILD\mono-
1.2.6\mcs\class\System\System.Configuration\CustomizableFileSettingsProvider.cs:692
 at System.Configuration.LocalFileSettingsProvider.SetPropertyValues (
System.Configuration.SettingsContext context,
System.Configuration.SettingsPropertyValueCollection values) [0x00000] in
C:\cygwin\tmp\monobuild\build\BUILD\mono-
1.2.6\mcs\class\System\System.Configuration\LocalFileSettingsProvider.cs:95
 at System.Configuration.ApplicationSettingsBase.Save () [0x00099] in
C:\cygwin\tmp\monobuild\build\BUILD\mono-
1.2.6\mcs\class\System\System.Configuration\ApplicationSettingsBase.cs:121
 at Program.Main (System.String[] args) [0x00000]

It is kind of hard to explain, but running the attached test code
demonstrates the issue (it runs on MS.NET without a problem).

I filed this as Bug
348646<https://bugzilla.novell.com/show_bug.cgi?id=348646>but wanted
to post it here also to alert everyone to it.

Thanks again,
Justin Cherniak
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