IObjectSpace.Evaluate(Type, CriteriaOperator, CriteriaOperator) Method

Evaluates the specified criteria for business objects of the given type.

Namespace: DevExpress.ExpressApp

Assembly: DevExpress.ExpressApp.v23.2.dll

NuGet Package: DevExpress.ExpressApp

Declaration

C#

object Evaluate(
    Type objectType,
    CriteriaOperator expression,
    CriteriaOperator criteria
)

VB.NET

Function Evaluate(
    objectType As Type,
    expression As CriteriaOperator,
    criteria As CriteriaOperator
) As Object

Parameters

Name	Type	Description
objectType	Type	A Type object that identifies the type of objects against which the expression will be evaluated.
expression	CriteriaOperator	A CriteriaOperator object that specifies the expression to evaluate.
criteria	CriteriaOperator	A CriteriaOperator object that specifies the filter criteria. The objects that match this criteria will be used to evaluate the expression.

Returns

Type	Description
Object	The value evaluated.

Remarks

To construct expression and criteria, the static CriteriaOperator.Parse method can be used. It takes a string representation of the required expression and retrieves the CriteriaOperator object that corresponds to this expression.

Related GitHub Examples

The following code snippet (auto-collected from DevExpress Examples) contains a reference to the Evaluate(Type, CriteriaOperator, CriteriaOperator) method.

Note

The algorithm used to collect these code examples remains a work in progress. Accordingly, the links and snippets below may produce inaccurate results. If you encounter an issue with code examples below, please use the feedback form on this page to report the issue.

C#

XAF_Non-Persistent-Objects-Reloading-Demo/CS/NonPersistentObjectsDemo.Module/BusinessObjects/LiveSummary.cs#L45

if(pos != null) {
    _Count = Convert.ToInt32(pos.Evaluate(typeof(Order), CriteriaOperator.Parse("Count()"), Criteria));
}

VB.NET

XAF_Non-Persistent-Objects-Reloading-Demo/VB/NonPersistentObjectsDemo.Module/BusinessObjects/LiveSummary.vb#L74

If pos IsNot Nothing Then
    _Count = Convert.ToInt32(pos.Evaluate(GetType(Order), CriteriaOperator.Parse("Count()"), Criteria))
End If