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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

Average

Lambda Query

Average: Computes the average value for a numeric collections.

Average: Computes the average value for a numeric collections.

This Lambda Expression sample calculates the average of values in array.

This Lambda Expression sample calculates the average of values in array.

  • C#
  • VB.Net
  • F#
// A Query Expression cannot be constructed for Average() in C#.
// Consider using a Lambda Expression instead.
Private Shared Sub Sample_Average_Linq()
    Dim numbers As Integer() = {10, 10, 11, 11}

    Dim result = Aggregate n In numbers Into Average()

    Debug.WriteLine("Average is:")
    Debug.WriteLine(result)
End Sub
Output:
Average is:
10.5
// There is no Average() for Query Expressions in F#, but it has the similar "averageBy".
let Sample_Average_Linq() =
    let numbers = [|10; 10; 11; 11|]

    let result = query {
        for n in numbers do
        averageBy (float n)
    }

    Debug.WriteLine(sprintf "Average is:")
    Debug.WriteLine(sprintf "%f" result)
Output:
Average is:
10.500000
  • C#
  • VB.Net
  • F#
static void Sample_Average_Lambda()
{
    int[] numbers = { 10, 10, 11, 11 };

    var result = numbers.Average();

    Debug.WriteLine("Average is:");
    Debug.WriteLine(result);
}
Output:
Average is:
10.5
Private Shared Sub Sample_Average_Lambda()
    Dim numbers As Integer() = {10, 10, 11, 11}

    Dim result = numbers.Average()

    Debug.WriteLine("Average is:")
    Debug.WriteLine(result)
End Sub
Output:
Average is:
10.5
let Sample_Average_Lambda() =
    let numbers = [|10; 10; 11; 11|]

    let result = numbers.Average()

    Debug.WriteLine(sprintf "Average is:")
    Debug.WriteLine(sprintf "%f" result)
Output:
Average is:
10.500000

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