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# Field.containsExtensionByName Method

Module: Field

## Definition

Returns a value indicating whether the field (or one of its child fields) contains an extension with specified name.

    bool containsExtensionByName(String? extensionName)

Parameters

`extensionName` String
in A string that identifies the extension.

Returns

`bool`
A value indicating whether the field (or one of its child fields) contains the specified extension.

Exceptions

BiosealException
An error has occurred during Bioseal Library execution.