XPBaseObject.Evaluate(CriteriaOperator) Method

Evaluates the specified expression against the current instance of the persistent object.

Namespace: DevExpress.Xpo

Assembly: DevExpress.Xpo.v21.2.dll

Declaration

C#

public object Evaluate(
    CriteriaOperator expression
)

VB.NET

Public Function Evaluate(
    expression As CriteriaOperator
) As Object

Parameters

Name	Type	Description
expression	CriteriaOperator	A CriteriaOperator object that specifies the expression to evaluate.

Returns

Type	Description
Object	The evaluated value.

Remarks

This method allows you to evaluate a specific expression against the current instance of the persistent object. The expression is specified by a CriteriaOperator object. By using another overload of the Evaluate method an expression can be specified as a string.

Related GitHub Examples

The following code snippet (auto-collected from DevExpress Examples) contains a reference to the Evaluate(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_how-to-calculate-a-master-property-based-on-values-from-a-details-collection-e305/CS/CalculatedPropertiesSolution.Module/BusinessObjects/Product.cs#L50

int? oldOrdersCount = fOrdersCount;
fOrdersCount = Convert.ToInt32(Evaluate(CriteriaOperator.Parse("Orders.Count")));
if (forceChangeEvents)

VB.NET

XAF_how-to-calculate-a-master-property-based-on-values-from-a-details-collection-e305/VB/CalculatedPropertiesSolution.Module/BusinessObjects/Product.vb#L63

Dim oldOrdersCount? As Integer = fOrdersCount
fOrdersCount = Convert.ToInt32(Evaluate(CriteriaOperator.Parse("Orders.Count")))
If forceChangeEvents Then