M_CodeJam_Collections_EnumerableExtensions_ToDictionary__3_1

EnumerableExtensions.ToDictionary(T, TKey, TElement) Method (IEnumerable(T), Func(T, TKey), Func(T, TElement), IEqualityComparer(TKey), DictionaryDuplicate)

Creates a Dictionary(TKey, TValue) from an IEnumerable(T) according to a specified key selector function, an element selector function, a comparer and a duplicate handling policy.

Namespace: CodeJam.Collections
Assembly: CodeJam (in CodeJam.dll) Version: 2.1.0.0

Syntax

C#

public static Dictionary<TKey, TElement> ToDictionary<T, TKey, TElement>(
	this IEnumerable<T> source,
	Func<T, TKey> keySelector,
	Func<T, TElement> elementSelector,
	IEqualityComparer<TKey> comparer,
	DictionaryDuplicate duplicateHandling
)

VB

<ExtensionAttribute>
Public Shared Function ToDictionary(Of T, TKey, TElement) ( 
	source As IEnumerable(Of T),
	keySelector As Func(Of T, TKey),
	elementSelector As Func(Of T, TElement),
	comparer As IEqualityComparer(Of TKey),
	duplicateHandling As DictionaryDuplicate
) As Dictionary(Of TKey, TElement)

F#

[<ExtensionAttribute>]
static member ToDictionary : 
        source : IEnumerable<'T> * 
        keySelector : Func<'T, 'TKey> * 
        elementSelector : Func<'T, 'TElement> * 
        comparer : IEqualityComparer<'TKey> * 
        duplicateHandling : DictionaryDuplicate -> Dictionary<'TKey, 'TElement> 

Parameters

 

source

Type: System.Collections.Generic.IEnumerable(T)
The source to create a lookup dictionary from.

keySelector

Type: System.Func(T, TKey)
A function to extract a key from each element.

elementSelector

Type: System.Func(T, TElement)
A transform function to produce a result element value from each element.

comparer

Type: System.Collections.Generic.IEqualityComparer(TKey)
An equality comparer to compare keys.

duplicateHandling

Type: CodeJam.Collections.DictionaryDuplicate
Policy for duplicate handling.

Type Parameters

 

T

The type of the elements of source.

TKey

The type of the value returned by keySelector.

TElement

The type of the value returned by elementSelector.

Return Value

Type: Dictionary(TKey, TElement)
A Dictionary(TKey, TValue) that contains keys and values.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IEnumerable(T). 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
ToDictionary Overload
CodeJam.Collections Namespace