Enumerable.Max<TSource, TResult> Method (IEnumerable<TSource>, Func<TSource, TResult>)
Invokes a transform function on each element of a generic sequence and returns the maximum resulting value.
Assembly: System.Core (in System.Core.dll)
public static TResult Max<TSource, TResult>( this IEnumerable<TSource> source, Func<TSource, TResult> selector )
Parameters
- source
-
Type:
System.Collections.Generic.IEnumerable<TSource>
A sequence of values to determine the maximum value of.
- selector
-
Type:
System.Func<TSource, TResult>
A transform function to apply to each element.
Return Value
Type: TResultThe maximum value in the sequence.
Type Parameters
- TSource
The type of the elements of source.
- TResult
The type of the value returned by selector.
| Exception | Condition |
|---|---|
| ArgumentNullException | source or selector is null. |
If type TResult implements IComparable<T>, this method uses that implementation to compare values. Otherwise, if type TResult implements IComparable, that implementation is used to compare values.
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.
Note |
|---|
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. */
Available since 8
.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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