Enumerable.Except<TSource> Method (IEnumerable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>)
[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]
Produces the set difference of two sequences by using the specified IEqualityComparer<T> to compare values.
Assembly: System.Core (in System.Core.dll)
public static IEnumerable<TSource> Except<TSource>( this IEnumerable<TSource> first, IEnumerable<TSource> second, IEqualityComparer<TSource> comparer )
Type Parameters
- TSource
The type of the elements of the input sequences.
Parameters
- first
- Type: System.Collections.Generic.IEnumerable<TSource>
An IEnumerable<T> whose elements that are not also in second will be returned.
- second
- Type: System.Collections.Generic.IEnumerable<TSource>
An IEnumerable<T> whose elements that also occur in the first sequence will cause those elements to be removed from the returned sequence.
- comparer
- Type: System.Collections.Generic.IEqualityComparer<TSource>
An IEqualityComparer<T> to compare values.
Return Value
Type: System.Collections.Generic.IEnumerable<TSource>A sequence that contains the set difference of the elements of two sequences.
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 | first or second is null. |
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