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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

Where (simple - numbers)

Lambda Query

Where: Filters elements from a collection to satisfy a specified condition.

Where: Filters elements from a collection to satisfy a specified condition.

This Lambda Expression sample finds numbers with values >= 15 and values <= 25.

This Lambda Expression sample finds numbers with values >= 15 and values <= 25.

  • C#
  • VB.Net
  • F#
static void Sample_Where_Linq_Numbers()
{
    int[] numbers = { 5, 10, 15, 20, 25, 30 };

    var result = from n in numbers
                 where n >= 15 && n <= 25
                 select n;

    Debug.WriteLine("Numbers being >= 15 and <= 25:");
    foreach (var number in result)
        Debug.WriteLine(number);
}
Output:
Numbers being >= 15 and <= 25:
15
20
25
Private Shared Sub Sample_Where_Linq_Numbers()
    Dim numbers As Integer() = {5, 10, 15, 20, 25, 30}

    Dim result = From n In numbers Where n >= 15 AndAlso n <= 25

    Debug.WriteLine("Numbers being >= 15 and <= 25:")
    For Each number In result
        Debug.WriteLine(number)
    Next
End Sub
Output:
Numbers being >= 15 and <= 25:
15
20
25
let Sample_Where_Linq_Numbers() =
    let numbers = [5; 10; 15; 20; 25; 30]

    let result = query {
        for n in numbers do
        where (n >= 15 && n <= 25)
    }

    Debug.WriteLine(sprintf "Numbers being >= 15 and <= 25:")
    for number in result do
        Debug.WriteLine(sprintf "%d" number)
Output:
Numbers being >= 15 and <= 25:
15
20
25
  • C#
  • VB.Net
  • F#
static void Sample_Where_Lambda_Numbers()
{
    int[] numbers = { 5, 10, 15, 20, 25, 30 };

    var result = numbers.Where(n => n >= 15 && n <= 25);

    Debug.WriteLine("Numbers being >= 15 and <= 25:");
    foreach (var number in result)
        Debug.WriteLine(number);
}
Output:
Numbers being >= 15 and <= 25:
15
20
25
Private Shared Sub Sample_Where_Lambda_Numbers()
    Dim numbers As Integer() = {5, 10, 15, 20, 25, 30}

    Dim result = numbers.Where(Function(n) n >= 15 AndAlso n <= 25)

    Debug.WriteLine("Numbers being >= 15 and <= 25:")
    For Each number In result
        Debug.WriteLine(number)
    Next
End Sub
Output:
Numbers being >= 15 and <= 25:
15
20
25
let Sample_Where_Lambda_Numbers() =
    let numbers = [5; 10; 15; 20; 25; 30]

    let result = numbers.Where(fun n -> n >= 15 && n <= 25);

    Debug.WriteLine(sprintf "Numbers being >= 15 and <= 25:")
    for number in result do
        Debug.WriteLine(sprintf "%d" number)
Output:
Numbers being >= 15 and <= 25:
15
20
25

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