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Enumerable.Min(Of TSource) Method (IEnumerable(Of TSource), Func(Of TSource, Nullable(Of Int32)))

Invokes a transform function on each element of a sequence and returns the minimum nullable Int32 value.

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

'Declaration
<ExtensionAttribute> _
Public Shared Function Min(Of TSource) ( _
	source As IEnumerable(Of TSource), _
	selector As Func(Of TSource, Nullable(Of Integer)) _
) As Nullable(Of Integer)

Type Parameters

TSource

The type of the elements of source.

Parameters

source
Type: System.Collections.Generic.IEnumerable(Of TSource)
A sequence of values to determine the minimum value of.
selector
Type: System.Func(Of TSource, Nullable(Of Int32))
A transform function to apply to each element.

Return Value

Type: System.Nullable(Of Int32)
The value of type Nullable<Int32> in C# or Nullable(Of Int32) in Visual Basic that corresponds to the minimum 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(Of TSource). When you use instance method syntax to call this method, omit the first parameter.

ExceptionCondition
ArgumentNullException

source or selector is Nothing.

The Min(Of TSource)(IEnumerable(Of TSource), Func(Of TSource, Nullable(Of Int32))) method uses the Int32 implementation of IComparable(Of 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<Int32> in C# or Nullable(Of Int32) in Visual Basic.

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

The following code example demonstrates how to use Min(Of TSource)(IEnumerable(Of TSource), Func(Of TSource, Int32)) to determine the minimum value in a sequence of projected values.

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.


   Structure Pet
      Public Name As String
      Public Age As Integer
   End Structure

   Sub MinEx4()
      ' Create an array of Pet objects.
      Dim pets() As Pet = {New Pet With {.Name = "Barley", .Age = 8}, _
                           New Pet With {.Name = "Boots", .Age = 4}, _
                           New Pet With {.Name = "Whiskers", .Age = 1}}

      ' Find the youngest pet by passing a 
      ' lambda expression to the Min() method.
      Dim min As Integer = pets.Min(Function(pet) pet.Age)

      ' Display the result.
      outputBlock.Text &= "The youngest pet is age " & min & vbCrLf
   End Sub

   ' This code produces the following output:
   '
   ' The youngest pet is age 1



Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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