Obtain IQueryable for select all from artificial type

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answered on 14 Oct 2010, 09:25 AM

Hello Krasimir,

Sorry for the delayed reply.
In fact this is a new feature in the product. It is part of the latest internal build of Telerik OpenAccess ORM with version 2010.2.1013.8.
In order to achieve this you should use the FieldValue method to access the value of the artificial field:

IQueryable result = scope.Extent<ClassName>().Where(p => p.FieldValue<FieldType>(FieldName) == CompareValue);

Hope that helps.

Greetings,
Damyan Bogoev
the Telerik team

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answered on 18 Oct 2010, 07:57 AM

public Type GetArtificialType(string typeName)

{

string fullName = GetArtificialFullTypeName(typeName);

//TODO find less expensive way of detecting type names - like cached artificial assembly name

IPersistentTypeDescriptor ptd = scope.PersistentMetaData.GetPersistentTypeDescriptor(fullName);

Object sampleInstance = ptd.CreateInstance(null);

return sampleInstance.GetType();

}

public IQueryable GetAllArtificial(string artificialTypeName)

{

Type type = GetArtificialType(artificialTypeName);

MethodInfo mInfo = typeof(Telerik.OpenAccess.ExtensionMethods).GetMethod("Extent").MakeGenericMethod(new Type[] { type });

System.Collections.IEnumerable query = (System.Collections.IEnumerable)mInfo.Invoke(scope, new object[] { scope });

return query.AsQueryable();

}

Actually I was asking about way to get all objects from particular type knowing only his class name (user selectable at runtime).

The above code does the trick at the price of some use of reflection and really  dumb way of  obtaining  artificial class type  from dynamic assembly.



I was hoping that telerik api allow some way of achieving this since same functionality is present for example in OpenAccessDataSource component  



Best regards 

Krasimir Filipov

answered on 20 Oct 2010, 06:32 PM

Hello Krasimir,

Currently we are working on this feature – Linq for artificial types. We will do our best to implement it for the next Q3 release which is scheduled for the middle of November.
You could also use OQL queries to retrieve this data instead of using reflection at the moment but I recommend you to wait for this functionality in Linq for the upcoming release, if it is possible for you.

Kind regards,
Damyan Bogoev
the Telerik team

Accepted