Enumerable.Min(Of TSource) Method (IEnumerable(Of TSource), Func(Of TSource, Nullable(Of Decimal)))
Invokes a transform function on each element of a sequence and returns the minimum nullable Decimal value.
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 Decimal)) _ ) As Nullable(Of Decimal)
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 Decimal))
A transform function to apply to each element.
Return Value
Type: System.Nullable(Of Decimal)The value of type Nullable<Decimal> in C# or Nullable(Of Decimal) 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. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).| Exception | Condition |
|---|---|
| ArgumentNullException | source or selector is Nothing. |
The Min(Of TSource)(IEnumerable(Of TSource), Func(Of TSource, Nullable(Of Decimal))) method uses the Decimal 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<Decimal> in C# or Nullable(Of Decimal) 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.
Note |
|---|
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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.
MsgBox("The youngest pet is age " & min)
End Sub
' This code produces the following output:
'
' The youngest pet is age 1
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
Note