EnumerableRowCollectionExtensions::ThenByDescending<TRow, TKey> Method (OrderedEnumerableRowCollection<TRow>^, Func<TRow, TKey>^, IComparer<TKey>^)
Performs a secondary ordering of the rows of a EnumerableRowCollection in descending order according to the specified key and comparer. This API supports the .NET Framework infrastructure and is not intended to be used directly from your code.
Assembly: System.Data.DataSetExtensions (in System.Data.DataSetExtensions.dll)
public: generic<typename TRow, typename TKey> [ExtensionAttribute] static OrderedEnumerableRowCollection<TRow>^ ThenByDescending( OrderedEnumerableRowCollection<TRow>^ source, Func<TRow, TKey>^ keySelector, IComparer<TKey>^ comparer )
Parameters
- source
-
Type:
System.Data::OrderedEnumerableRowCollection<TRow>^
An EnumerableRowCollection containing the DataRow elements to be ordered.
- keySelector
-
Type:
System::Func<TRow, TKey>^
A function to extract a key from an element.
- comparer
-
Type:
System.Collections.Generic::IComparer<TKey>^
An IComparer<T> to compare keys.
Return Value
Type: System.Data::OrderedEnumerableRowCollection<TRow>^An OrderedEnumerableRowCollection<TRow> whose elements are sorted by the specified key and comparer.
Type Parameters
- TRow
The type of the row elements in source, typically DataRow.
- TKey
The type of the key returned by keySelector.
The use of a ThenByDescending operation requires an existing primary sorting operation using OrderBy.
This method is implemented by using deferred execution. The immediate return value is an object that stores all the information that is required to perform the action. The query represented by this method is not executed until the object is enumerated either by calling its GetEnumerator method directly or by using foreach in Visual C# or For Each in Visual Basic.
Available since 3.5
M:System.Data.EnumerableRowCollectionExtensions.Select``2(System.Data.EnumerableRowCollection{``0},System.Linq.Expressions.Expression{System.Func{``0,``1}})
OrderByDescending
ThenByDescending<TSource, TKey>
ThenByDescending Overload
EnumerableRowCollectionExtensions Class
System.Data Namespace