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

Reference

Definition

Namespace:: System.Collections.Generic

Assembly:: System.Collections.dll

Assembly:: mscorlib.dll

Assembly:: netstandard.dll

Source:: Dictionary.cs

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Determines whether the ICollection<T> contains a specific value.

 virtual bool System.Collections.Generic.ICollection<TKey>.Contains(TKey item) = System::Collections::Generic::ICollection<TKey>::Contains;

bool ICollection<TKey>.Contains (TKey item);

abstract member System.Collections.Generic.ICollection<TKey>.Contains : 'Key -> bool
override this.System.Collections.Generic.ICollection<TKey>.Contains : 'Key -> bool

Function Contains (item As TKey) As Boolean Implements ICollection(Of TKey).Contains

Parameters

item: TKey

The object to locate in the ICollection<T>.

Returns

Boolean

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

Implements

Contains(T)

Remarks

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

This method is an O(1) operation.

Applies to

Delen via