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.NET Standard 2.0+

Session.FindObject<ClassType>(PersistentCriteriaEvaluationBehavior, CriteriaOperator) Method

Searches for the first object of the type designated by the specified generic type parameter which matches the specified criteria.

Namespace: DevExpress.Xpo

Assembly: DevExpress.Xpo.v19.2.dll

Declaration

public ClassType FindObject<ClassType>(
    PersistentCriteriaEvaluationBehavior criteriaEvaluationBehavior,
    CriteriaOperator criteria
)
Public Function FindObject(Of ClassType)(
    criteriaEvaluationBehavior As PersistentCriteriaEvaluationBehavior,
    criteria As CriteriaOperator
) As ClassType
public ClassType FindObject<ClassType>(
    PersistentCriteriaEvaluationBehavior criteriaEvaluationBehavior,
    CriteriaOperator criteria
)
Public Function FindObject(Of ClassType)(
    criteriaEvaluationBehavior As PersistentCriteriaEvaluationBehavior,
    criteria As CriteriaOperator
) As ClassType

Parameters

Name Type Description
criteriaEvaluationBehavior PersistentCriteriaEvaluationBehavior

A PersistentCriteriaEvaluationBehavior enumeration value that specifies how the persistent criteria is evaluated.

criteria CriteriaOperator

A CriteriaOperator descendant which represents the criteria to match persistent objects.

Parameters

Name Type Description
criteriaEvaluationBehavior PersistentCriteriaEvaluationBehavior

A PersistentCriteriaEvaluationBehavior enumeration value that specifies how the persistent criteria is evaluated.

criteria CriteriaOperator

A CriteriaOperator descendant which represents the criteria to match persistent objects.

Returns

Type Description
ClassType

An object which represents the first persistent object matching the specified criteria. null (Nothing in Visual Basic) if no persistent object matching the criteria is found.

Returns

Type Description
ClassType

An object which represents the first persistent object matching the specified criteria. null (Nothing in Visual Basic) if no persistent object matching the criteria is found.

Type Parameters

Name Description
ClassType

Type Parameters

Name Description
ClassType

Remarks

Below is an example of using the FindObject<ClassType> method. Here, session is the Session instance.

using DevExpress.Data.Filtering;
using DevExpress.Xpo;
// ...
Person personToUpdate = session.FindObject<Person>(PersistentCriteriaEvaluationBehavior.BeforeTransaction, 
    CriteriaOperator.Parse("Name='Michael Suyama'"));
if(personToUpdate != null) {
    personToUpdate.Birthday = new DateTime(1986, 10, 31);
    session.Save(personToUpdate);
}

Persistent objects that are marked as deleted in the database (see Deferred and Immediate Object Deletion) are not included in the search.

See Also