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Enumerable.Min<TSource> Method (IEnumerable<TSource>, Func<TSource, Nullable<Int64>>)


Invokes a transform function on each element of a sequence and returns the minimum nullable Int64 value.

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

public static Nullable<long> Min<TSource>(
	this IEnumerable<TSource> source,
	Func<TSource, Nullable<long>> selector


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

A sequence of values to determine the minimum value of.

Type: System.Func<TSource, Nullable<Int64>>

A transform function to apply to each element.

Return Value

Type: System.Nullable<Int64>

The value of type Nullable<Int64> in C# or Nullable(Of Int64) in Visual Basic that corresponds to the minimum value in the sequence.

Type Parameters


The type of the elements of source.

Exception Condition

source or selector is null.

The Min<TSource>(IEnumerable<TSource>, Func<TSource, Nullable<Int64>>) method uses the Int64 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<Int64> in C# or Nullable(Of Int64) 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<TSource>(IEnumerable<TSource>, Func<TSource, Int32>) to determine the minimum value in a sequence of projected values.


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 MinEx4()
    Pet[] pets = { new Pet { Name="Barley", Age=8 },
                   new Pet { Name="Boots", Age=4 },
                   new Pet { Name="Whiskers", Age=1 } };

    int min = pets.Min(pet => pet.Age);

    Console.WriteLine("The youngest animal is age {0}.", min);

 This code produces the following output:

 The youngest animal is age 1.  

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