CriteriaOperator.GetCustomFunction(String) Method

Searches custom functions registered in an application via the CriteriaOperator.RegisterCustomFunction and CriteriaOperator.RegisterCustomFunctions method calls for a function with a specified name.

Namespace: DevExpress.Data.Filtering

Assembly: DevExpress.Core.v21.2.dll

NuGet Package: DevExpress.Uwp.Controls

Declaration

C#

public static ICustomFunctionOperator GetCustomFunction(
    string functionName
)

VB.NET

Public Shared Function GetCustomFunction(
    functionName As String
) As ICustomFunctionOperator

Parameters

Name	Type	Description
functionName	String	The name of a custom function to search. You specify a custom function’s name by implementing the ICustomFunctionOperator.Name property.

Returns

Type	Description
ICustomFunctionOperator	An ICustomFunctionOperator object that corresponds to the functionName, if found; otherwise, null (Nothing in Visual Basic).

Remarks

This method searches a collection returned by the CriteriaOperator.GetCustomFunctions function for a custom function whose name matches the functionName.

Related GitHub Examples

The following code snippet (auto-collected from DevExpress Examples) contains a reference to the GetCustomFunction(String) 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-use-data-from-security-in-criterion/CS/CustomFunctionCriteriaOperator.Module/CurrentCompanyOidParameter.cs#L24

CurrentCompanyOidOperator instance = new CurrentCompanyOidOperator();
if (CriteriaOperator.GetCustomFunction(instance.Name) == null) {
   CriteriaOperator.RegisterCustomFunction(instance);

VB.NET

xaf-how-to-use-data-from-security-in-criterion/VB/CustomFunctionCriteriaOperator.Module/CurrentCompanyOidParameter.vb#L26

Dim instance As New CurrentCompanyOidOperator()
If CriteriaOperator.GetCustomFunction(instance.Name) Is Nothing Then
   CriteriaOperator.RegisterCustomFunction(instance)