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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

Take

Lambda Query

Take: Takes specified number of elements in a collection, starting from first element.

Take: Takes specified number of elements in a collection, starting from first element.

This Lambda Expression sample takes only 5 first numbers in array.

This Lambda Expression sample takes only 5 first numbers in array.

  • C#
  • VB.Net
  • F#
// A Query Expression cannot be constructed for Take() in C#.
// Consider using a Lambda Expression instead.
Private Shared Sub Sample_Take_Linq()
    Dim numbers As Integer() = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}

    Dim result = From n In numbers Take 5

    Debug.WriteLine("Takes the first 5 numbers only:")
    For Each number As Integer In result
        Debug.WriteLine(number)
     Next
End Sub
Output:
Takes the first 5 numbers only:
1
2
3
4
5
let Sample_Take_Linq() =
    let numbers = [|1; 2; 3; 4; 5; 6; 7; 8; 9; 10|];

    let result = query {
        for n in numbers do
        take 5
    }

    Debug.WriteLine("Takes the first 5 numbers only:");
    for number in result do
        Debug.WriteLine(sprintf "%d" number)
Output:
Takes the first 5 numbers only:
1
2
3
4
5
  • C#
  • VB.Net
  • F#
static void Sample_Take_Lambda()
{
    int[] numbers = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };

    var result = numbers.Take(5);

    Debug.WriteLine("Takes the first 5 numbers only:");
    foreach (int number in result)
        Debug.WriteLine(number);
}
Output:
Takes the first 5 numbers only:
1
2
3
4
5
Private Shared Sub Sample_Take_Lambda()
    Dim numbers As Integer() = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}

    Dim result = numbers.Take(5)

    Debug.WriteLine("Takes the first 5 numbers only:")
    For Each number As Integer In result
        Debug.WriteLine(number)
    Next
End Sub
Output:
Takes the first 5 numbers only:
1
2
3
4
5
let Sample_Take_Lambda() =
    let numbers = [|1; 2; 3; 4; 5; 6; 7; 8; 9; 10|];

    let result = numbers.Take(5);

    Debug.WriteLine("Takes the first 5 numbers only:");
    for number in result do
        Debug.WriteLine(sprintf "%d" number)
Output:
Takes the first 5 numbers only:
1
2
3
4
5

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