Readonly objects

[Raoul]

Hi,

I was wondering if it was possible to load objects as readonly from a table to make sure they can never be changed during code execution. I did some digging in the documentation and thought to have found my solution:
- create a partial class for the object, which is linked to the generated object
- decorate that class with <Telerik.OpenAccess.DataAccessKind(DataAccessKind.ReadOnly)>

However this threw some nasty errors on compiling:
E:\myData.dll(-1,-1): OpenAccess Enhancer error 0: Object reference not set to an instance of an object.
E:\myData.dll(-1,-1): OpenAccess Enhancer error 0: ExceptionString:
E:\myData.dll(-1,-1): OpenAccess Enhancer error 0: System.NullReferenceException: Object reference not set to an instance of an object.
E:\myData.dll(-1,-1): OpenAccess Enhancer error 0:    at Telerik.OpenAccess.Metadata.MetadataCollection`1.InsertItem(Int32 index, T item)
E:\myData.dll(-1,-1): OpenAccess Enhancer error 0:    at System.Collections.ObjectModel.Collection`1.Add(T item)
E:\myData.dll(-1,-1): OpenAccess Enhancer error 0:    at Telerik.OpenAccess.Metadata.MetadataAttributesReader.ReadPersistentTypes()
E:\myData.dll(-1,-1): OpenAccess Enhancer error 0:    at Telerik.OpenAccess.Metadata.MetadataAttributesReader.ReadMetaModel()
E:\myData.dll(-1,-1): OpenAccess Enhancer error 0:    at Telerik.OpenAccess.Metadata.MetadataAttributesReader.ReadMetaModel(Assembly assembly)
E:\myData.dll(-1,-1): OpenAccess Enhancer error 0:    at Telerik.OpenAccess.Metadata.AttributesMetadataSource.<>c__DisplayClass1.<FromAssembly>b__0()
E:\myData.dll(-1,-1): OpenAccess Enhancer error 0:    at Telerik.OpenAccess.Metadata.AttributesMetadataSource.CreateModel()
E:\myData.dll(-1,-1): OpenAccess Enhancer error 0:    at Telerik.OpenAccess.Metadata.MetadataSource.GetModelCore(MetadataContainer old)
E:\myData.dll(-1,-1): OpenAccess Enhancer error 0:    at Telerik.OpenAccess.Sdk.Enhancer.Enhancer.CrossDomainRunImpl(AssemblyLoader assemblyLoader)
E:\myData.dll(-1,-1): OpenAccess Enhancer error 0:    at Telerik.OpenAccess.Sdk.Enhancer.EnhancerBase.CrossDomainRun()

When removing the readonly decoration from the class definition, the error is gone. So my question remains:

How to make the object(s) readonly?

Regards,
Raoul

[Jan Blessenohl]

Hello Raoul,
You can not make single objects read only but the complete context instance:
context.ReadOnly = true;

Regards,
Jan Blessenohl
the Telerik team

[Raoul]

Hi Jan,

Thanks for your reply. As you suggested I created a read only context and this works flawless.

Regards,
Raoul