M_CodeJam_Collections_EnumerableExtensions_ExceptBy__2_1

EnumerableExtensions.ExceptBy(TSource, TKey) Method (IEnumerable(TSource), IEnumerable(TSource), Func(TSource, TKey), IEqualityComparer(TKey))

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

Namespace: CodeJam.Collections
Assembly: CodeJam (in CodeJam.dll) Version: 1.0.0.0 (1.0.0.0)

Syntax

C#

public static IEnumerable<TSource> ExceptBy<TSource, TKey>(
	this IEnumerable<TSource> first,
	IEnumerable<TSource> second,
	Func<TSource, TKey> keySelector,
	IEqualityComparer<TKey> comparer
)

VB

<ExtensionAttribute>
Public Shared Function ExceptBy(Of TSource, TKey) ( 
	first As IEnumerable(Of TSource),
	second As IEnumerable(Of TSource),
	keySelector As Func(Of TSource, TKey),
	comparer As IEqualityComparer(Of TKey)
) As IEnumerable(Of TSource)

F#

[<ExtensionAttribute>]
static member ExceptBy : 
        first : IEnumerable<'TSource> * 
        second : IEnumerable<'TSource> * 
        keySelector : Func<'TSource, 'TKey> * 
        comparer : IEqualityComparer<'TKey> -> IEnumerable<'TSource> 

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.

keySelector

Type: System.Func(TSource, TKey)
A function to extract the key for each element.

comparer

Type: System.Collections.Generic.IEqualityComparer(TKey)
An IEqualityComparer(T) to compare values.

Type Parameters

 

TSource

TKey

Return Value

Type: 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. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).

See Also

Reference

EnumerableExtensions Class
ExceptBy Overload
CodeJam.Collections Namespace