[Mono-devel-list] Problems wth ds.ReadXml () (DataSet)

[Philip Van Hoof]

Hi there,

When I want to read a DataSet from an XML-file from both a
ManifestResource or a file I always get this Exception:

"A null value was found where an object instance was required"

I am running mono-0.30 on a Fedora Core 1

This is the code I am trying:

DataSet conf = new DataSet();
Assembly a = c.GetType().Assembly;
System.IO.Stream ConfigFile =
a.GetManifestResourceStream("Cronos.Xnet.XnetDotBe.DAL.DALConfig.xml"); 
-> Exception point <-
conf.ReadXml (ConfigFile);
-> Exception point <-

When I loop the resource-names I do get the resource
"Cronos.Xnet.XnetDotBe.DAL.DALConfig.xml" in the string-array (so the
resource actually does exist). Note that it has been compiled using VS
2003 .NET (not using Mono).

I can also try something like :

conf.ReadXml ("/home/freax/cvs/XnetDotBe/XnetDotBe/bin/DALConfig.xml");

And read the XML from a file on my filesystem (and indeed, that file
'does' exist, of course -I am not VERY stupid, you know-)

'The line' (so not my code) will throw the same exception


I am indeed running this code using xsp (it's a ASP.NET website, yes)


This is how my xml-file looks  (nothing THAT strange about it huh):

On Microsoft .NET it will load the DataSet with a table Config and
columns like "ConnectionString" and "DatabaseType". This code works
1000% perfectly on the Microsoft .NET framework (and it's not very very
platform specific, imho)

<?xml version="1.0" encoding="utf-8" ?>
<Config>

<!-- Database connectivity settings //-->
        <ConnectionString>server=localhost;User
ID=xnet;Password=xnet;database=XnetDotBe</ConnectionString>
        <DatabaseType>SqlServer</DatabaseType>

<!-- Other possibilities //-->
<!--    <ConnectionString>server=W2SK-MSSQL;User
ID=sa;Password=;database=Default</ConnectionString> //-->
<!--    <DatabaseType>Oracle</DatabaseType> //-->
<!--    <DatabaseType>MySQL</DatabaseType> //-->
<!--    <DatabaseType>PostgreSQL</DatabaseType> //-->
<!--    <DatabaseType>Odbc</DatabaseType> //-->
<!--    <DatabaseType>SqlServer</DatabaseType> //-->

<!-- The Implementations for each Interface //-->
       
<IProject>Cronos.Xnet.XnetDotBe.DAL.Implementations.SqlServer.Project</IProject>
        <IProject.Assembly>DAL</IProject.Assembly>
       
<IEmployee>Cronos.Xnet.XnetDotBe.DAL.Implementations.SqlServer.Employee</IEmployee>
        <IEmployee.Assembly>DAL</IEmployee.Assembly>
        <ICustomer>Cronos.Xnet.XnetDotBe.DAL.Customer</ICustomer>
        <ICustomer.Assembly>DAL</ICustomer.Assembly>
        <ITechDomain>Cronos.Xnet.XnetDotBe.DAL.TechDomain</ITechDomain>
        <ITechDomain.Assembly>DAL</ITechDomain.Assembly>
        <ITechnology>Cronos.Xnet.XnetDotBe.DAL.Technology</ITechnology>
        <ITechnology.Assembly>DAL</ITechnology.Assembly>

</Config>