Enumerable.Contains<TSource> Method (IEnumerable<TSource>, TSource, IEqualityComparer<TSource>)

May 11, 2014

Determines whether a sequence contains a specified element by using a specified IEqualityComparer<T>.

Namespace:  System.Linq
Assembly:  System.Core (in System.Core.dll)

public static bool Contains<TSource>(
	this IEnumerable<TSource> source,
	TSource value,
	IEqualityComparer<TSource> comparer
)

Type Parameters

TSource

The type of the elements of source.

Parameters

source
Type: System.Collections.Generic.IEnumerable<TSource>
A sequence in which to locate a value.
value
Type: TSource
The value to locate in the sequence.
comparer
Type: System.Collections.Generic.IEqualityComparer<TSource>
An equality comparer to compare values.

Return Value

Type: System.Boolean
true if the source sequence contains an element that has the specified value; otherwise, false.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IEnumerable<TSource>. When you use instance method syntax to call this method, omit the first parameter.

ExceptionCondition
ArgumentNullException

source is null.

Enumeration is terminated as soon as a matching element is found.

If comparer is null, the default equality comparer, Default, is used to compare elements to the specified value.

Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

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