FunctionOperator Class

The operator in Criteria Language expressions that represents a function.

Namespace: DevExpress.Data.Filtering

Assembly: DevExpress.XamarinForms.Core.dll

Declaration

[Serializable]
public class FunctionOperator :
    CriteriaOperator

Related API Members

The following members return FunctionOperator objects:

• FunctionOperator.Clone()

Remarks

The FunctionOperator supports custom functions. All custom function objects should implement the ICustomFunctionOperator interface, and you should register them using the CriteriaOperator.RegisterCustomFunction or CriteriaOperator.RegisterCustomFunctions method.

Related GitHub Examples

The following code snippet (auto-collected from DevExpress Examples) contains a reference to the FunctionOperator class.

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#

XDL_how-to-delete-all-criteria-corresponding-to-a-particular-field-from-criteriaoperator-e3396/CS/PatchCriteriaExample/Filtering/CriteriaPatcherSkipProperties.cs#L49

public override CriteriaOperator Visit(FunctionOperator theOperator) {
    var result = (FunctionOperator)base.Visit(theOperator);

VB.NET

XDL_how-to-delete-all-criteria-corresponding-to-a-particular-field-from-criteriaoperator-e3396/VB/PatchCriteriaExample/Filtering/CriteriaPatcherSkipProperties.vb#L67

Public Overrides Function Visit(ByVal theOperator As FunctionOperator) As CriteriaOperator
    Dim result = CType(MyBase.Visit(theOperator), FunctionOperator)

Inheritance

Object

CriteriaOperator

FunctionOperator