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LINQ to Objects

Aggregation

Aggregate, Average, Count, LongCount, Max, Min, Sum

      Aggregate (simple)       Aggregate (seed)       Average       Count       LongCount       Max       Min       Sum

Conversion

AsEnumerable, Cast, OfType, ToArray, ToDictionary, ToList, ToLookup

      AsEnumerable       Cast       OfType       ToArray       ToDictionary (simple)       ToDictionary (conditional)       ToList       ToLookup

Element

ElementAt, ElementAtOrDefault, First, FirstOrDefault, Last, LastOrDefault, Single, SingleOrDefault

      ElementAt       ElementAtOrDefault       First (simple)       First (conditional)       FirstOrDefault       Last       LastOrDefault (simple)       LastOrDefault (conditional)       Single       SingleOrDefault

Generation

DefaultIfEmpty, Empty, Range, Repeat

      DefaultIfEmpty (simple)       DefaultIfEmpty (default value)       Empty       Range       Repeat

Grouping

GroupBy

      GroupBy

Join

GroupJoin, Join

      GroupJoin (left outer join)       Join (inner join)

Ordering

OrderBy, OrderByDescending, Reverse, ThenBy, ThenByDescending

      OrderBy (simple - numbers)       OrderBy (simple - dates)       OrderBy (simple - objects)       OrderByDescending       Reverse       ThenBy       ThenByDescending

Other

Concat, SequenceEqual, Zip

      Concat (simple - numbers)       Concat (simple - strings)       SequenceEqual       Zip

Partitioning

Skip, SkipWhile, Take, TakeWhile

      Skip       SkipWhile       Take       TakeWhile

Projection

Select, SelectMany

      Select (simple)       Select (anonymous type)       Select (indexed)       SelectMany (cross join)

Quantifiers

All, Any, Contains

      All       Any       Contains

Restriction

Where

      Where (simple - numbers)       Where (simple - objects)       Where (indexed)

Set

Distinct, Except, Intersect, Union

      Distinct       Except       Intersect       Union
  Close

Last

Lambda Query

Last: Retrieves last element from a collection. Throws exception if collection is empty.

Last: Retrieves last element from a collection. Throws exception if collection is empty.

This Lambda Expression sample retrieves last element from array.

This Lambda Expression sample retrieves last element from array.

  • C#
  • VB.Net
  • F#
// A Query Expression cannot be constructed for Last() in C#.
// Consider using a Lambda Expression instead.
' A Query Expression cannot be constructed for Last() in VB.NET.
' Consider using a Lambda Expression instead.
let Sample_Last_Linq() =
    let numbers = [|7; 3; 5|]

    let result = query {
        for n in numbers do
        last
    }

    Debug.WriteLine(sprintf "Last number in array is:")
    Debug.WriteLine(sprintf "%d" result)
Output:
Last number in array is:
5
  • C#
  • VB.Net
  • F#
static void Sample_Last_Lambda()
{
    int[] numbers = { 7, 3, 5 };

    var result = numbers.Last();

    Debug.WriteLine("Last number in array is:");
    Debug.WriteLine(result);
}
Output:
Last number in array is:
5
Private Shared Sub Sample_Last_Lambda()
    Dim numbers As Integer() = {7, 3, 5}

    Dim result = numbers.Last()

    Debug.WriteLine("Last number in array is:")
    Debug.WriteLine(result)
End Sub
Output:
Last number in array is:
5
let Sample_Last_Lambda() =
    let numbers = [|7; 3; 5|]

    let result = numbers.Last()

    Debug.WriteLine(sprintf "Last number in array is:")
    Debug.WriteLine(sprintf "%d" result)
Output:
Last number in array is:
5

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