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11/17/2011

HashSet<T> Constructor (IEnumerable<T>, IEqualityComparer<T>)

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Initializes a new instance of the HashSet<T> class that uses the specified equality comparer for the set type, contains elements copied from the specified collection, and has sufficient capacity to accommodate the number of elements copied.

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

Syntax

'Declaration
Public Sub New ( _
    collection As IEnumerable(Of T), _
    comparer As IEqualityComparer(Of T) _
)

public HashSet(
    IEnumerable<T> collection,
    IEqualityComparer<T> comparer
)

Parameters

collection
Type: System.Collections.Generic.IEnumerable<T>
The collection whose elements are copied to the new set.

comparer
Type: System.Collections.Generic.IEqualityComparer<T>
The IEqualityComparer<T> implementation to use when comparing values in the set, or nulla null reference (Nothing in Visual Basic) to use the default EqualityComparer<T> implementation for the set type.

Exceptions

Exception	Condition
ArgumentNullException	collection is nulla null reference (Nothing in Visual Basic).

Remarks

The capacity of a HashSet<T> object is the number of elements that the object can hold. A HashSet<T> object's capacity automatically increases as elements are added to the object.

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

Version Information

Silverlight

Supported in: 5, 4

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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