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# Enumerable.Max(TSource) Method (IEnumerable(TSource), Func(TSource, Nullable(Decimal)))

Visual Studio 2008

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

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

## Syntax

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#### Type Parameters

TSource

The type of the elements of source.

#### Parameters

source
Type: System.Collections.Generic.IEnumerable(TSource)

A sequence of values to determine the maximum value of.

selector
Type: System.Func(TSource, Nullable(Decimal))

A transform function to apply to each element.

#### Return Value

Type: System.Nullable(Decimal)
The value of type Nullable<Decimal> in C# or Nullable(Of Decimal) in Visual Basic that corresponds to the maximum value in the sequence.

#### Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IEnumerable(TSource). 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
ArgumentNullException

source or selector is a null reference (Nothing in Visual Basic).

## Remarks

The Max(TSource)(IEnumerable(TSource), Func(TSource, Nullable(Decimal))) method uses the Decimal 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 Nullable<Decimal> in C# or Nullable(Of Decimal) in Visual Basic.

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

## Examples

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.

No code example is currently available or this language may not be supported.

## Platforms

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

## Version Information

#### .NET Framework

Supported in: 3.5

#### .NET Compact Framework

Supported in: 3.5

#### XNA Framework

Supported in: 3.0