OrderByDescending(TRow, TKey) Method (TypedTableBase(TRow), Func(TRow, TKey))

TypedTableBaseExtensions.OrderByDescending<TRow, TKey> Method (TypedTableBase<TRow>, Func<TRow, TKey>)

Sorts the rows of a TypedTableBase<T> in descending order according to the specified key.

Namespace:  System.Data
Assembly:  System.Data.DataSetExtensions (in System.Data.DataSetExtensions.dll)

public static OrderedEnumerableRowCollection<TRow> OrderByDescending<TRow, TKey>(
	this TypedTableBase<TRow> source,
	Func<TRow, TKey> keySelector
where TRow : DataRow

Type Parameters


The type of the row elements in source, typically DataRow.


The type of the key returned by keySelector.


Type: System.Data.TypedTableBase<TRow>

A TypedTableBase<T> that contains the DataRow elements to be ordered.

Type: System.Func<TRow, TKey>

A function to extract a key from an element.

Return Value

Type: System.Data.OrderedEnumerableRowCollection<TRow>
An OrderedEnumerableRowCollection<TRow> whose elements are sorted by the specified key.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type TypedTableBase<TRow>. When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5

.NET Compact Framework

Supported in: 3.5

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