Enumerable.Contains<'TSource> Method (IEnumerable<'TSource>, 'TSource, IEqualityComparer<'TSource>)
Determines whether a sequence contains a specified element by using a specified IEqualityComparer<'T>.
Assembly: System.Core (in System.Core.dll)
static member Contains<'TSource> : source:IEnumerable<'TSource> * value:'TSource * comparer:IEqualityComparer<'TSource> -> bool
A sequence in which to locate a value.
The value to locate in the sequence.
An equality comparer to compare values.
Return ValueType: System.Boolean
true if the source sequence contains an element that has the specified value; otherwise, false.
The type of the elements of source.
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.
The following example shows how to implement an equality comparer that can be used in themethod.
After you implement this comparer, you can use a sequence of Product objects in the method, as shown in the following example.
Available since 4.5
Available since 3.5
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Available since 8.1