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.