CriteriaOperator.UnregisterCustomFunction(ICustomFunctionOperator) Method

Cancels registration of the specified custom function.

Namespace: DevExpress.Data.Filtering

Assembly: DevExpress.XamarinForms.Core.dll

NuGet Package: DevExpress.XamarinForms.Core

Declaration

public static bool UnregisterCustomFunction(
    ICustomFunctionOperator customFunction
)

Parameters

Name	Type	Description
customFunction	ICustomFunctionOperator	The custom function whose registration should be cancelled.

Returns

Type	Description
Boolean	true, if a the specified function was removed from a collection of custom functions; otherwise, false.

Remarks

The CriteriaOperator.GetCustomFunction(String) and CriteriaOperator.GetCustomFunctions methods return registered functions.

You can register new functions via the CriteriaOperator.RegisterCustomFunction or CriteriaOperator.RegisterCustomFunctions method.

Related GitHub Examples

The following code snippets (auto-collected from DevExpress Examples) contain references to the UnregisterCustomFunction(ICustomFunctionOperator) 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#

how-to-create-and-register-custom-filter-editor-functions/CS/DXApplication5/CustomFunctions/NotBeginsWith.cs#L16

public static bool Unregister() {
    return CriteriaOperator.UnregisterCustomFunction(instance);
}

how-to-register-a-custom-filter-function-and-use-it-in-gridcontrol-e3514/CS/WindowsApplication3/IsDayOffFunction.cs#L18

{
    return CriteriaOperator.UnregisterCustomFunction(instance);
}

VB.NET

how-to-create-and-register-custom-filter-editor-functions/VB/DXApplication5/CustomFunctions/NotBeginsWith.vb#L13

Public Shared Function Unregister() As Boolean
    Return CriteriaOperator.UnregisterCustomFunction(instance)
End Function

how-to-register-a-custom-filter-function-and-use-it-in-gridcontrol-e3514/VB/WindowsApplication3/IsDayOffFunction.vb#L18

Public Shared Function Unregister() As Boolean
    Return CriteriaOperator.UnregisterCustomFunction(instance)
End Function