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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

Contains

Lambda Query

Contains: Checks if any elements in a collection satisifies a specified value.

Contains: Checks if any elements in a collection satisifies a specified value.

This Lambda Expression sample checks whether array of numbers contains value of 5.

This Lambda Expression sample checks whether array of numbers contains value of 5.

  • C#
  • VB.Net
  • F#
// A Query Expression cannot be constructed for Contains() in C#.
// Consider using a Lambda Expression instead.
' A Query Expression cannot be constructed for Contains() in C#.
' Consider using a Lambda Expression instead.
let Sample_Contains_Linq() =
    let numbers = [|1; 3; 5; 7; 9|]

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

    Debug.WriteLine(sprintf "Sequence contains the value 5:")
    Debug.WriteLine(sprintf "%b" result)
Output:
Sequence contains the value 5:
true
  • C#
  • VB.Net
  • F#
static void Sample_Contains_Lambda()
{
    int[] numbers = { 1, 3, 5, 7, 9 };

    var result = numbers.Contains(5);

    Debug.WriteLine("sequence contains the value 5:");
    Debug.WriteLine(result);
}
Output:
Sequence contains the value 5:
True
Private Shared Sub Sample_Contains_Lambda()
    Dim numbers As Integer() = {1, 3, 5, 7, 9}

    Dim result = numbers.Contains(5)

    Debug.WriteLine("Sequence contains the value 5:")
    Debug.WriteLine(result)
End Sub
Output:
Sequence contains the value 5:
True
let Sample_Contains_Lambda() =
    let numbers = [|1; 3; 5; 7; 9|]

    let result = numbers.Contains(5)

    Debug.WriteLine(sprintf "Sequence contains the value 5:")
    Debug.WriteLine(sprintf "%b" result)
Output:
Sequence contains the value 5:
true

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