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Enumerable::Distinct<TSource> Method (IEnumerable<TSource>^, IEqualityComparer<TSource>^)


Returns distinct elements from a sequence by using a specified IEqualityComparer<T> to compare values.

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

generic<typename TSource>
static IEnumerable<TSource>^ Distinct(
	IEnumerable<TSource>^ source,
	IEqualityComparer<TSource>^ comparer


Type: System.Collections.Generic::IEnumerable<TSource>^

The sequence to remove duplicate elements from.

Type: System.Collections.Generic::IEqualityComparer<TSource>^

An IEqualityComparer<T> to compare values.

Return Value

Type: System.Collections.Generic::IEnumerable<TSource>^

An IEnumerable<T> that contains distinct elements from the source sequence.

Type Parameters


The type of the elements of source.

Exception Condition

source is null.

This method is implemented by using deferred execution. The immediate return value is an object that stores all the information that is required to perform the action. The query represented by this method is not executed until the object is enumerated either by calling its GetEnumerator method directly or by using foreach in Visual C# or For Each in Visual Basic.

The Distinct<TSource>(IEnumerable<TSource>^, IEqualityComparer<TSource>^) method returns an unordered sequence that contains no duplicate values. If comparer is null, the default equality comparer, Default, is used to compare values.

The following example shows how to implement an equality comparer that can be used in the Distinct<TSource> 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 Distinct<TSource> method, as shown in the following example.

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

Universal Windows Platform
Available since 4.5
.NET Framework
Available since 3.5
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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