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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

Aggregate (simple)

Lambda Query

Aggregate: Performs a specified operation to each element in a collection, while carrying the result forward.

Aggregate: Performs a specified operation to each element in a collection, while carrying the result forward.

This Lambda Expression sample aggregates numbers in array by multiplication.

This Lambda Expression sample aggregates numbers in array by multiplication.

  • C#
  • VB.Net
  • F#
// A Query Expression cannot be constructed for Aggregate() in C#.
// Consider using a Lambda Expression instead.
' A Query Expression cannot be constructed for Aggregate() in VB.NET.
' Consider using a Lambda Expression instead.
// A Query Expression cannot be constructed for Aggregate() in F#.
// Consider using a Lambda Expression instead.
  • C#
  • VB.Net
  • F#
private static void Sample_Aggregate_Lambda_Simple()
{
    var numbers = new int[] { 1, 2, 3, 4, 5 };

    var result = numbers.Aggregate((a, b) => a * b);

    Debug.WriteLine("Aggregated numbers by multiplication:");
    Debug.WriteLine(result);
}
Output:
Aggregated numbers by multiplication:
120
Private Shared Sub Sample_Aggregate_Lambda_Simple()
    Dim numbers = New Integer() {1, 2, 3, 4, 5}

    Dim result = numbers.Aggregate(Function(a, b) a * b)

    Debug.WriteLine("Aggregated numbers by multiplication:")
    Debug.WriteLine(result)
End Sub
Output:
Aggregated numbers by multiplication:
120
let Sample_Aggregate_Lambda_Simple() =
    let numbers = [|1; 2; 3; 4; 5|]

    let result = numbers.Aggregate(fun a b -> a * b)
    
    Debug.WriteLine(sprintf "Aggregated numbers by multiplication:")
    Debug.WriteLine(sprintf "%d" result)
Output:
Aggregated numbers by multiplication:
120

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