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Showing content from https://morelinq.github.io/3.0/ref/api/html/M_MoreLinq_Extensions_ExceptByExtension_ExceptBy__2.htm below:

ExceptByExtensionExceptByTSource, TKey Method (IEnumerableTSource, IEnumerableTSource, FuncTSource, TKey)

Returns the set of elements in the first sequence which aren't in the second sequence, according to a given key selector.

MoreLinq (in MoreLinq.dll) Version: 3.0.0

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

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

public:
[ExtensionAttribute]
generic<typename TSource, typename TKey>
static IEnumerable<TSource>^ ExceptBy(
	IEnumerable<TSource>^ first, 
	IEnumerable<TSource>^ second, 
	Func<TSource, TKey>^ keySelector
)

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

first

Type: System.Collections.GenericIEnumerableTSource
The sequence of potentially included elements.

second

Type: System.Collections.GenericIEnumerableTSource
The sequence of elements whose keys may prevent elements in first from being returned.

keySelector

Type: SystemFuncTSource, TKey
The mapping from source element to key.

TSource

The type of the elements in the input sequences.

TKey

The type of the key returned by keySelector.

Type:

A sequence of elements from

whose key was not also a key for any element in

.

In Visual Basic and C#, you can call this method as an instance method on any object of type

. When you use instance method syntax to call this method, omit the first parameter. For more information, see

or

.

This is a set operation; if multiple elements in first have equal keys, only the first such element is returned. This operator uses deferred execution and streams the results, although a set of keys from second is immediately selected and retained.

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