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Dictionary(Of TKey, TValue) Constructor (IDictionary(Of TKey, TValue))

Initializes a new instance of the Dictionary(Of TKey, TValue) class that contains elements copied from the specified IDictionary(Of TKey, TValue) and uses the default equality comparer for the key type.

Namespace:  System.Collections.Generic
Assembly:  mscorlib (in mscorlib.dll)

'Declaration
Public Sub New ( _
	dictionary As IDictionary(Of TKey, TValue) _
)

Parameters

dictionary
Type: System.Collections.Generic.IDictionary(Of TKey, TValue)

The IDictionary(Of TKey, TValue) whose elements are copied to the new Dictionary(Of TKey, TValue).

ExceptionCondition
ArgumentNullException

dictionary is Nothing.

ArgumentException

dictionary contains one or more duplicate keys.

Every key in a Dictionary(Of TKey, TValue) must be unique according to the default equality comparer; likewise, every key in the source dictionary must also be unique according to the default equality comparer.

The initial capacity of the new Dictionary(Of TKey, TValue) is large enough to contain all the elements in dictionary.

Dictionary(Of TKey, TValue) requires an equality implementation to determine whether keys are equal. This constructor uses the default generic equality comparer, EqualityComparer(Of T).Default. If type TKey implements the System.IEquatable(Of T) generic interface, the default equality comparer uses that implementation. Alternatively, you can specify an implementation of the IEqualityComparer(Of T) generic interface by using a constructor that accepts a comparer parameter.

This constructor is an O(n) operation, where n is the number of elements in dictionary.

The following code example shows how to use the Dictionary(Of TKey, TValue)(IEqualityComparer(Of TKey)) constructor to initialize a Dictionary(Of TKey, TValue) with sorted content from another dictionary. The code example creates a SortedDictionary(Of TKey, TValue) and populates it with data in random order, then passes the SortedDictionary(Of TKey, TValue) to the Dictionary(Of TKey, TValue)(IEqualityComparer(Of TKey)) constructor, creating a Dictionary(Of TKey, TValue) that is sorted. This is useful if you need to build a sorted dictionary that at some point becomes static; copying the data from a SortedDictionary(Of TKey, TValue) to a Dictionary(Of TKey, TValue) improves retrieval speed.

Imports System
Imports System.Collections.Generic

Public Class Example

    Public Shared Sub Main() 

        ' Create a new sorted dictionary of strings, with string  
        ' keys. 
        Dim openWith As New SortedDictionary(Of String, String)

        ' Add some elements to the sorted dictionary. 
        openWith.Add("txt", "notepad.exe")
        openWith.Add("bmp", "paint.exe")
        openWith.Add("dib", "paint.exe")
        openWith.Add("rtf", "wordpad.exe")

        ' Create a Dictionary of strings with string keys, and  
        ' initialize it with the contents of the sorted dictionary. 
        Dim copy As New Dictionary(Of String, String)(openWith)

        ' List the contents of the copy.
        Console.WriteLine()
        For Each kvp As KeyValuePair(Of String, String) In copy
            Console.WriteLine("Key = {0}, Value = {1}", _
                kvp.Key, kvp.Value)
        Next kvp

    End Sub 

End Class 

' This code example produces the following output: 

'Key = bmp, Value = paint.exe 
'Key = dib, Value = paint.exe 
'Key = rtf, Value = wordpad.exe 
'Key = txt, Value = notepad.exe

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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