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Namespace:System.Linq
Assembly:System.Core.dll
Extends:IEnumerable<T>

Back to Standard Query Operator Index


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Introduction

The Contains operator checks whether a sequence contains a given element.

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Method Signatures

public static bool Contains<TSource>(
    this IEnumerable<TSource> source, 
    TSource value)
 
//New in January CTP
public static bool Contains<TSource>(
    this IEnumerable<TSource> source, 
    TSource value, 
    IEqualityComparer<TSource> comparer)



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Exceptions

Throws an ArgumentNullException if source is null.

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Pseudocode

If source is null, throw ArgumentNullException.
If comparer is null, make it EqualityComparer<TSource>.Default;
Iterate the source sequence
- if the element == value return true
return false if end of sequence and no match found.


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Code Samples

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