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# Field.containsKey Method

Module: Field

## Definition

Determines whether the Fieldobject contains the specified key.

    bool containsKey(String? key)

Parameters

`key` String
in The key to locate in the Field object.

Returns

`bool`
true if the Field object contains an element with the specified key, otherwise false.

Exceptions

BiosealException
An error has occurred during Bioseal Library execution.