IDictionary.Keys Property


Gets an ICollection object containing the keys of the IDictionary object.

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

ReadOnly Property Keys As ICollection

Property Value

Type: System.Collections.ICollection

An ICollection object containing the keys of the IDictionary object.

The order of the keys in the returned ICollection object is unspecified, but is guaranteed to be the same order as the corresponding values in the ICollection returned by the Values property.

The following code example demonstrates how to implement the Keys property. This code example is part of a larger example provided for the IDictionary class.

Public ReadOnly Property Keys() As ICollection Implements IDictionary.Keys

        ' Return an array where each item is a key.
        ' Note: Declaring keyArray() to have a size of ItemsInUse - 1
        '       ensures that the array is properly sized, in VB.NET
        '       declaring an array of size N creates an array with
        '       0 through N elements, including N, as opposed to N - 1
        '       which is the default behavior in C# and C++.
        Dim keyArray() As Object = New Object(ItemsInUse - 1) {}
        Dim n As Integer
        For n = 0 To ItemsInUse - 1
            keyArray(n) = items(n).Key
        Next n

        Return keyArray
    End Get
End Property

Universal Windows Platform
Available since 8
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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