Creates a DictionaryTKey, TValue from an IEnumerableT according to a specified key selector function, a comparer, and an element selector function.
Assembly: System.Core (in System.Core.dll)
<[%$TOPIC/bb548652_en-us_VS_110_3_0_0_0_0%]> _
Public Shared Function ToDictionary(Of TSource, TKey, TElement) ( _
source As [%$TOPIC/bb548652_en-us_VS_110_3_0_0_0_1%](Of TSource), _
keySelector As [%$TOPIC/bb548652_en-us_VS_110_3_0_0_0_2%](Of TSource, TKey), _
elementSelector As [%$TOPIC/bb548652_en-us_VS_110_3_0_0_0_3%](Of TSource, TElement), _
comparer As [%$TOPIC/bb548652_en-us_VS_110_3_0_0_0_4%](Of TKey) _
) As [%$TOPIC/bb548652_en-us_VS_110_3_0_0_0_5%](Of TKey, TElement)public static [%$TOPIC/bb548652_en-us_VS_110_3_0_1_0_0%]<TKey, TElement> ToDictionary<TSource, TKey, TElement>(
this [%$TOPIC/bb548652_en-us_VS_110_3_0_1_0_1%]<TSource> source,
[%$TOPIC/bb548652_en-us_VS_110_3_0_1_0_2%]<TSource, TKey> keySelector,
[%$TOPIC/bb548652_en-us_VS_110_3_0_1_0_3%]<TSource, TElement> elementSelector,
[%$TOPIC/bb548652_en-us_VS_110_3_0_1_0_4%]<TKey> comparer
)[[%$TOPIC/bb548652_en-us_VS_110_3_0_2_0_0%]]
public:
generic<typename TSource, typename TKey, typename TElement>
static [%$TOPIC/bb548652_en-us_VS_110_3_0_2_0_1%]<TKey, TElement>^ ToDictionary(
[%$TOPIC/bb548652_en-us_VS_110_3_0_2_0_2%]<TSource>^ source,
[%$TOPIC/bb548652_en-us_VS_110_3_0_2_0_3%]<TSource, TKey>^ keySelector,
[%$TOPIC/bb548652_en-us_VS_110_3_0_2_0_4%]<TSource, TElement>^ elementSelector,
[%$TOPIC/bb548652_en-us_VS_110_3_0_2_0_5%]<TKey>^ comparer
)static member ToDictionary :
source:[%$TOPIC/bb548652_en-us_VS_110_3_0_3_0_0%]<'TSource> *
keySelector:[%$TOPIC/bb548652_en-us_VS_110_3_0_3_0_1%]<'TSource, 'TKey> *
elementSelector:[%$TOPIC/bb548652_en-us_VS_110_3_0_3_0_2%]<'TSource, 'TElement> *
comparer:[%$TOPIC/bb548652_en-us_VS_110_3_0_3_0_3%]<'TKey> -> [%$TOPIC/bb548652_en-us_VS_110_3_0_3_0_4%]<'TKey, 'TElement> Type Parameters
- TSource
The type of the elements of source.
- TKey
The type of the key returned by keySelector.
- TElement
The type of the value returned by elementSelector.
Parameters
- source
- Type:
System.Collections.GenericIEnumerableTSource
An IEnumerableT to create a DictionaryTKey, TValue from.
- keySelector
- Type:
SystemFuncTSource, TKey
A function to extract a key from each element.
- elementSelector
- Type:
SystemFuncTSource, TElement
A transform function to produce a result element value from each element.
- comparer
- Type:
System.Collections.GenericIEqualityComparerTKey
An IEqualityComparerT to compare keys.
Return Value
Type: System.Collections.GenericDictionaryTKey, TElementA DictionaryTKey, TValue that contains values of type TElement selected from the input sequence.
Usage Note
In Visual Basic and C#, you can call this method as an instance method on any object of type IEnumerableTSource. 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).| Exception | Condition |
|---|---|
| ArgumentNullException | source or keySelector or elementSelector is . -or- keySelector produces a key that is . |
| ArgumentException | keySelector produces duplicate keys for two elements. |
Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
