Gemstone IO Library
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# FileBackedDictionary TKey, TValue, TKeyElem, TValueElem ContainsKey Method

Determines whether the FileBackedDictionaryTKey, TValue contains an element with the specified key.

## Definition

Namespace: Gemstone.IO.Collections
Assembly: Gemstone.IO (in Gemstone.IO.dll) Version: 1.0.154 -- Release Build+690e585b1010bc9bfdc9c11ba61c54180863b212
C#
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    public bool ContainsKey(
    	TKey key
    )

VB
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    Public Function ContainsKey (
    	key As TKey
    ) As Boolean

C++
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    public:
    virtual bool ContainsKey(
    	TKey key
    ) sealed

JavaScript
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    function ContainsKey(key);

#### Parameters

key TKey
  The key to locate in the FileBackedDictionaryTKey, TValue.

#### Return Value

Boolean
true if the FileBackedDictionaryTKey, TValue contains an element with the key; otherwise, false.

#### Implements

IDictionaryTKey, TValue ContainsKey(TKey)

## Exceptions

ArgumentNullException | key is null.

## See Also

#### Reference

FileBackedDictionaryTKey, TValue, TKeyElem, TValueElem Class
Gemstone.IO.Collections Namespace