Enumerable.Except(TSource) Method (IEnumerable(TSource), IEnumerable(TSource), IEqualityComparer(TSource))

Produces the set difference of two sequences by using the specified IEqualityComparer(T) to compare values.

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

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

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.

ExceptionCondition
ArgumentNullException

first or second is a null reference (Nothing in Visual Basic).

If comparer is a null reference (Nothing in Visual Basic), 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 Except method.

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

After you implement this comparer, you can use sequences of Product objects in the Except method, as shown in the following example.

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

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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