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MoreEnumerableMaxByTSource, TKey Method (IEnumerableTSource, FuncTSource, TKey, IComparerTKey)

Returns the maximal elements of the given sequence, based on the given projection and the specified comparer for projected values.

Namespace:  MoreLinq
Assembly:  MoreLinq (in MoreLinq.dll) Version: 3.0.0
Syntax
public static IExtremaEnumerable<TSource> MaxBy<TSource, TKey>(
	this IEnumerable<TSource> source,
	Func<TSource, TKey> selector,
	IComparer<TKey> comparer
)

Parameters

source
Type: System.Collections.GenericIEnumerableTSource
Source sequence
selector
Type: SystemFuncTSource, TKey
Selector to use to pick the results to compare
comparer
Type: System.Collections.GenericIComparerTKey
Comparer to use to compare projected values

Type Parameters

TSource
Type of the source sequence
TKey
Type of the projected element

Return Value

Type: IExtremaEnumerableTSource
The maximal element, according to the projection.

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).
Exceptions
ExceptionCondition
ArgumentNullExceptionsource, selector or comparer is null
InvalidOperationExceptionsource is empty
Remarks
This operator uses deferred execution. The results are evaluated and cached on first use to returned sequence.
See Also