.. index:: 
  !Field.containsExtensionByName Method
  
.. _id3_bioseal_field_contains_extension_by_name_class_method:

===============================================================================
Field.containsExtensionByName Method
===============================================================================

Module: :ref:`Field<id3_bioseal_field_class>`

Definition
----------

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


.. code:: Dart

    bool containsExtensionByName(String? extensionName)

**Parameters**

.. line-block::

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


**Returns**

.. line-block::

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

**Exceptions**

.. line-block::

    :ref:`BiosealException<id3_bioseal_bioseal_exception>`
    An error has occurred during Bioseal Library execution.



