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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

Select (simple)

Lambda Query

Select: Selects, projects and transforms elements in a collection.

Select: Selects, projects and transforms elements in a collection.

This Lambda Expression sample selects and rounds down each number in array.

This Lambda Expression sample selects and rounds down each number in array.

  • C#
  • VB.Net
  • F#
static void Sample_Select_Linq_Simple()
{
    decimal[] numbers = { 3.4M, 8.33M, 5.225M };

    var result = (from n in numbers
                  select Math.Floor(n));

    Debug.WriteLine("Numbers rounded down:");
    foreach (int number in result)
        Debug.WriteLine(number);
}
Output:
Numbers rounded down:
3
8
5
Private Shared Sub Sample_Select_Linq_Simple()
    Dim numbers As Decimal() = {3.4D, 8.33D, 5.225D}

    Dim result = From n In numbers Select Math.Floor(n)

    Debug.WriteLine("Numbers rounded down:")
    For Each number As Integer In result
        Debug.WriteLine(number)
    Next
End Sub
Output:
Numbers rounded down:
3
8
5
let Sample_Select_Linq_Simple() =
    let numbers = [|3.4M; 8.33M; 5.225M|]

    let result = query {
        for n in numbers do
        select (floor(n))
    }

    Debug.WriteLine(sprintf "Numbers rounded down:")
    for number in result do
        Debug.WriteLine(sprintf "%f" number)
Output:
Numbers rounded down:
3.000000
8.000000
5.000000
  • C#
  • VB.Net
  • F#
static void Sample_Select_Lambda_Simple()
{
    decimal[] numbers = { 3.4M, 8.33M, 5.225M };

    var result = numbers.Select(n => Math.Floor(n));

    Debug.WriteLine("Numbers rounded down:");
    foreach (int number in result)
        Debug.WriteLine(number);
}
Output:
Numbers rounded down:
3
8
5
Private Shared Sub Sample_Select_Lambda_Simple()
    Dim numbers As Decimal() = {3.4D, 8.33D, 5.225D}

    Dim result = numbers.Select(Function(n) Math.Floor(n))

    Debug.WriteLine("Numbers rounded down:")
    For Each number As Integer In result
        Debug.WriteLine(number)
    Next
End Sub
Output:
Numbers rounded down:
3
8
5
let Sample_Select_Lambda_Simple() =
    let numbers = [|3.4M; 8.33M; 5.225M|]

    let result = numbers.Select(fun n -> floor n)

    Debug.WriteLine(sprintf "Numbers rounded down:")
    for number in result do
        Debug.WriteLine(sprintf "%f" number)
Output:
Numbers rounded down:
3.000000
8.000000
5.000000

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