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HashSet<T>.GetAlternateLookup<TAlternate> Method

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Definition

Namespace:
System.Collections.Generic
Assembly:
System.Collections.dll

Gets an instance of a type that can be used to perform operations on the current HashSet<T> using a TAlternate instead of a T.

public:
generic <typename TAlternate>
 System::Collections::Generic::HashSet<T>::AlternateLookup<TAlternate> GetAlternateLookup();
public System.Collections.Generic.HashSet<T>.AlternateLookup<TAlternate> GetAlternateLookup<TAlternate> ();
member this.GetAlternateLookup : unit -> System.Collections.Generic.HashSet<'T>.AlternateLookup<'Alternate>
Public Function GetAlternateLookup(Of TAlternate) () As HashSet(Of T).AlternateLookup(Of TAlternate)

Type Parameters

TAlternate

The alternate type of instance for performing lookups.

Returns

HashSet<T>.AlternateLookup<TAlternate>

The created lookup instance.

Exceptions

InvalidOperationException

The set's comparer is not compatible with TAlternate.

Remarks

The set must use a comparer that implements IAlternateEqualityComparer<TAlternate,T> with TAlternate and T. If it doesn't, an exception is thrown.

Applies to