Enumerable.MaxBy Method
Definition
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Overloads
| MaxBy<TSource,TKey>(IEnumerable<TSource>, Func<TSource,TKey>, IComparer<TKey>) |
Returns the maximum value in a generic sequence according to a specified key selector function and key comparer. |
| MaxBy<TSource,TKey>(IEnumerable<TSource>, Func<TSource,TKey>) |
Returns the maximum value in a generic sequence according to a specified key selector function. |
MaxBy<TSource,TKey>(IEnumerable<TSource>, Func<TSource,TKey>, IComparer<TKey>)
Returns the maximum value in a generic sequence according to a specified key selector function and key comparer.
public:
generic <typename TSource, typename TKey>
[System::Runtime::CompilerServices::Extension]
static TSource MaxBy(System::Collections::Generic::IEnumerable<TSource> ^ source, Func<TSource, TKey> ^ keySelector, System::Collections::Generic::IComparer<TKey> ^ comparer);public static TSource? MaxBy<TSource,TKey> (this System.Collections.Generic.IEnumerable<TSource> source, Func<TSource,TKey> keySelector, System.Collections.Generic.IComparer<TKey>? comparer);static member MaxBy : seq<'Source> * Func<'Source, 'Key> * System.Collections.Generic.IComparer<'Key> -> 'Source<Extension()>
Public Function MaxBy(Of TSource, TKey) (source As IEnumerable(Of TSource), keySelector As Func(Of TSource, TKey), comparer As IComparer(Of TKey)) As TSourceType Parameters
- TSource
The type of the elements of source.
- TKey
The type of key to compare elements by.
Parameters
- source
- IEnumerable<TSource>
A sequence of values to determine the maximum value of.
- keySelector
- Func<TSource,TKey>
A function to extract the key for each element.
- comparer
- IComparer<TKey>
The IComparer<T> to compare keys.
Returns
- TSource
The value with the maximum key in the sequence.
Exceptions
source is null.
No key extracted from source implements the IComparable or IComparable<T> interface.
Remarks
If TKey is a reference type and the source sequence is empty or contains only values that are null, this method returns null.
Applies to
MaxBy<TSource,TKey>(IEnumerable<TSource>, Func<TSource,TKey>)
Returns the maximum value in a generic sequence according to a specified key selector function.
public:
generic <typename TSource, typename TKey>
[System::Runtime::CompilerServices::Extension]
static TSource MaxBy(System::Collections::Generic::IEnumerable<TSource> ^ source, Func<TSource, TKey> ^ keySelector);public static TSource? MaxBy<TSource,TKey> (this System.Collections.Generic.IEnumerable<TSource> source, Func<TSource,TKey> keySelector);static member MaxBy : seq<'Source> * Func<'Source, 'Key> -> 'Source<Extension()>
Public Function MaxBy(Of TSource, TKey) (source As IEnumerable(Of TSource), keySelector As Func(Of TSource, TKey)) As TSourceType Parameters
- TSource
The type of the elements of source.
- TKey
The type of key to compare elements by.
Parameters
- source
- IEnumerable<TSource>
A sequence of values to determine the maximum value of.
- keySelector
- Func<TSource,TKey>
A function to extract the key for each element.
Returns
- TSource
The value with the maximum key in the sequence.
Exceptions
source is null.
No key extracted from source implements the IComparable or IComparable<T> interface.
Remarks
If TKey is a reference type and the source sequence is empty or contains only values that are null, this method returns null.