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

Determines whether a sequence contains a specified element by using a specified IEqualityComparer(T).

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

No code example is currently available or this language may not be supported.

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 a null reference (Nothing in Visual Basic).

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

If comparer is a null reference (Nothing in Visual Basic), the default equality comparer, Default, is used to compare elements to the specified value.

The following example shows how to implement an equality comparer that can be used in the Contains method.

No code example is currently available or this language may not be supported.

After you implement this comparer, you can use a sequence of Product objects in the Contains method, as shown in the following example.

No code example is currently available or this language may not be supported.

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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