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Enumerable.Max<TSource> Method (IEnumerable<TSource>, Func<TSource, Double>)

 

Invokes a transform function on each element of a sequence and returns the maximum Double value.

Namespace:   System.Linq
Assembly:  System.Core (in System.Core.dll)

public static double Max<TSource>(
	this IEnumerable<TSource> source,
	Func<TSource, double> selector
)

Parameters

source
Type: System.Collections.Generic.IEnumerable<TSource>

A sequence of values to determine the maximum value of.

selector
Type: System.Func<TSource, Double>

A transform function to apply to each element.

Return Value

Type: System.Double

The maximum value in the sequence.

Type Parameters

TSource

The type of the elements of source.

Exception Condition
ArgumentNullException

source or selector is null.

InvalidOperationException

source contains no elements.

The Max<TSource>(IEnumerable<TSource>, Func<TSource, Double>) method uses the Double implementation of IComparable<T> to compare values.

You can apply this method to a sequence of arbitrary values if you provide a function, selector, that projects the members of source into a numeric type, specifically Double.

In Visual Basic query expression syntax, an Aggregate Into Max() clause translates to an invocation of Max.

The following code example demonstrates how to use Max<TSource>(IEnumerable<TSource>, Func<TSource, Int32>) to determine the maximum value in a sequence of projected values.

System_CAPS_noteNote

This code example uses an overload of this overloaded method that is different from the specific overload that this topic describes. To extend the example to this topic, change the body of the selector function.

class Pet
{
    public string Name { get; set; }
    public int Age { get; set; }
}

public static void MaxEx4()
{
    Pet[] pets = { new Pet { Name="Barley", Age=8 },
                   new Pet { Name="Boots", Age=4 },
                   new Pet { Name="Whiskers", Age=1 } };

    int max = pets.Max(pet => pet.Age + pet.Name.Length);

    Console.WriteLine(
        "The maximum pet age plus name length is {0}.",
        max);
}

/*
 This code produces the following output:

 The maximum pet age plus name length is 14.
*/

Universal Windows Platform
Available since 4.5
.NET Framework
Available since 3.5
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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