ICollection<T>.Contains(T) Method

Definition

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

public bool Contains (T item);

Parameters

item
T

The object to locate in the ICollection<T>.

Returns

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

Remarks

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

Applies to

Product Versions
.NET Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9
.NET Framework 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 2.0, 2.1
UWP 10.0