Enumerable.Contains<TSource> Method (IEnumerable<TSource>, TSource, IEqualityComparer<TSource>)
[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]
Determines whether a sequence contains a specified element by using a specified IEqualityComparer<T>.
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.Booleantrue 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.| Exception | Condition |
|---|---|
| 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.
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