ICollection(TKey).Contains Method

SortedDictionary<TKey, TValue>.KeyCollection.ICollection<TKey>.Contains Method

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

Determines whether the ICollection<T> contains the specified value.

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

bool ICollection<TKey>.Contains(
	TKey item
)

Parameters

item
Type: TKey
The object to locate in the ICollection<T>.

Return Value

Type: System.Boolean
true if item is found in the ICollection<T>; otherwise, false.

Implements

ICollection<T>.Contains(T)

Implementations can vary in how they determine equality of objects; for example, List<T> uses Comparer<T>.Default, whereas SortedDictionary<TKey, TValue> allows the user to specify the IComparer<T> implementation to use for comparing keys.

This method is an O(1) operation.

Windows Phone OS

Supported in: 8.1, 8.0

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