Gemstone IO Library
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# FileBackedDictionary TKey, TValue Constructor

Creates a new instance of the FileBackedDictionaryTKey, TValue class.

## Definition

Namespace: Gemstone.IO.Collections
Assembly: Gemstone.IO (in Gemstone.IO.dll) Version: 1.0.160 -- Release Build+169caca5192ac5075949df0220a553c99300004a
C#
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    public FileBackedDictionary()

VB
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    Public Sub New

C++
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    public:
    FileBackedDictionary()

JavaScript
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    Gemstone.IO.Collections.FileBackedDictionary = function();

## Remarks

This constructor uses the default equality comparer for file backed lookup tables, which is not the same as the default equality comparer for TKey objects. This is because the default implementation of GetHashCode does not provide guarantees about consistency across platforms, or even implementations of the CLR. Instead, the default equality comparer uses a byte-for-byte comparison to determine equality between keys and a CRC-32 for its hash code implementation. This means the performance of the hashing function is dependent on the performance of the serialization function.

## Exceptions

InvalidOperationException | Either TKey or TValue cannot be serialized.

## See Also

#### Reference

FileBackedDictionaryTKey, TValue Class
FileBackedDictionaryTKey, TValue Overload
Gemstone.IO.Collections Namespace