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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

OrderByDescending

Lambda Query

OrderByDescending: Sorts a collection in descending order.

OrderByDescending: Sorts a collection in descending order.

This Lambda Expression sample sorts array of names in descending order.

This Lambda Expression sample sorts array of names in descending order.

  • C#
  • VB.Net
  • F#
static void Sample_OrderByDescending_Linq()
{
    string[] names = { "Ned", "Ben", "Susan" };

    var result = from n in names
                 orderby n descending
                 select n;

    Debug.WriteLine("Descending ordered list of names:");
    foreach (string name in result)
        Debug.WriteLine(name);
}
Output:
Descending ordered list of names:
Susan
Ned
Ben
Private Shared Sub Sample_OrderByDescending_Linq()
    Dim names As String() = {"Ned", "Ben", "Susan"}

    Dim result = From n In names Order By n Descending

    Debug.WriteLine("Descending ordered list of names:")
    For Each name As String In result
        Debug.WriteLine(name)
    Next
End Sub
Output:
Descending ordered list of names:
Susan
Ned
Ben
let Sample_OrderByDescending_Linq() =
    let names = [|"Ned"; "Ben"; "Susan"|]

    let result = query {
        for n in names do
        sortByDescending n
    }

    Debug.WriteLine(sprintf "Descending ordered list of names:")
    for name in result do
        Debug.WriteLine(sprintf "%s" name)
Output:
Descending ordered list of names:
Susan
Ned
Ben
  • C#
  • VB.Net
  • F#
static void Sample_OrderByDescending_Lambda()
{
    string[] names = { "Ned", "Ben", "Susan" };

    var result = names.OrderByDescending(n => n);

    Debug.WriteLine("Descending ordered list of names:");
    foreach (string name in result)
        Debug.WriteLine(name);
}
Output:
Descending ordered list of names:
Susan
Ned
Ben
Private Shared Sub Sample_OrderByDescending_Lambda()
    Dim names As String() = {"Ned", "Ben", "Susan"}

    Dim result = names.OrderByDescending(Function(n) n)

    Debug.WriteLine("Descending ordered list of names:")
    For Each name As String In result
        Debug.WriteLine(name)
    Next
End Sub
Output:
Descending ordered list of names:
Susan
Ned
Ben
let Sample_OrderByDescending_Lambda() =
    let names = [|"Ned"; "Ben"; "Susan"|]

    let result = names.OrderByDescending(fun n -> n);

    Debug.WriteLine(sprintf "Descending ordered list of names:")
    for name in result do
        Debug.WriteLine(sprintf "%s" name)
Output:
Descending ordered list of names:
Susan
Ned
Ben

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