MoreEnumerableOrderedMergeTFirst, TSecond, TKey, TResult Method (IEnumerableTFirst, IEnumerableTSecond, FuncTFirst, TKey, FuncTSecond, TKey, FuncTFirst, TResult, FuncTSecond, TResult, FuncTFirst, TSecond, TResult)

Merges two heterogeneous sequences ordered by a common key type into a homogeneous one. Additional parameters specify the element key by which the sequences are ordered, the result when element is found in first sequence but not in the second and the result when element is found in second sequence but not in the first, the result when elements are found in both sequences.

Namespace: MoreLinq
Assembly: MoreLinq (in MoreLinq.dll) Version: 2.4.0

Syntax

C++

Copy

public static IEnumerable<TResult> OrderedMerge<TFirst, TSecond, TKey, TResult>(
	this IEnumerable<TFirst> first,
	IEnumerable<TSecond> second,
	Func<TFirst, TKey> firstKeySelector,
	Func<TSecond, TKey> secondKeySelector,
	Func<TFirst, TResult> firstSelector,
	Func<TSecond, TResult> secondSelector,
	Func<TFirst, TSecond, TResult> bothSelector
)

<ExtensionAttribute>
Public Shared Function OrderedMerge(Of TFirst, TSecond, TKey, TResult) ( 
	first As IEnumerable(Of TFirst),
	second As IEnumerable(Of TSecond),
	firstKeySelector As Func(Of TFirst, TKey),
	secondKeySelector As Func(Of TSecond, TKey),
	firstSelector As Func(Of TFirst, TResult),
	secondSelector As Func(Of TSecond, TResult),
	bothSelector As Func(Of TFirst, TSecond, TResult)
) As IEnumerable(Of TResult)

public:
[ExtensionAttribute]
generic<typename TFirst, typename TSecond, typename TKey, typename TResult>
static IEnumerable<TResult>^ OrderedMerge(
	IEnumerable<TFirst>^ first, 
	IEnumerable<TSecond>^ second, 
	Func<TFirst, TKey>^ firstKeySelector, 
	Func<TSecond, TKey>^ secondKeySelector, 
	Func<TFirst, TResult>^ firstSelector, 
	Func<TSecond, TResult>^ secondSelector, 
	Func<TFirst, TSecond, TResult>^ bothSelector
)

[<ExtensionAttribute>]
static member OrderedMerge : 
        first : IEnumerable<'TFirst> * 
        second : IEnumerable<'TSecond> * 
        firstKeySelector : Func<'TFirst, 'TKey> * 
        secondKeySelector : Func<'TSecond, 'TKey> * 
        firstSelector : Func<'TFirst, 'TResult> * 
        secondSelector : Func<'TSecond, 'TResult> * 
        bothSelector : Func<'TFirst, 'TSecond, 'TResult> -> IEnumerable<'TResult>

Parameters

first: Type: System.Collections.GenericIEnumerableTFirst
The first input sequence.
second: Type: System.Collections.GenericIEnumerableTSecond
The second input sequence.
firstKeySelector: Type: SystemFuncTFirst, TKey
Function to extract a key given an element from the first sequence.
secondKeySelector: Type: SystemFuncTSecond, TKey
Function to extract a key given an element from the second sequence.
firstSelector: Type: SystemFuncTFirst, TResult
Function to project the result element when only the first sequence yields a source element.
secondSelector: Type: SystemFuncTSecond, TResult
Function to project the result element when only the second sequence yields a source element.
bothSelector: Type: SystemFuncTFirst, TSecond, TResult
Function to project the result element when only both sequences yield a source element whose keys are equal.

Type Parameters

TFirst: Type of elements in the first sequence.
TSecond: Type of elements in the second sequence.
TKey: Type of keys used for merging.
TResult: Type of elements in the returned sequence.

Return Value

Type: IEnumerableTResult
A sequence with projections from the two input sequences merged according to a key, as in a full outer join.

Usage Note

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

Remarks

This method uses deferred execution. The behavior is undefined if the sequences are unordered (by key) as inputs.

Reference

MoreEnumerable Class

OrderedMerge Overload

MoreLinq Namespace