Queryable.OrderDescending Method

Definition

Namespace:

System.Linq

Assemblies:

netstandard.dll, System.Linq.Queryable.dll

Overloads

OrderDescending<T>(IQueryable<T>, IComparer<T>)	Sorts the elements of a sequence in descending order.
OrderDescending<T>(IQueryable<T>)	Sorts the elements of a sequence in descending order.

OrderDescending<T>(IQueryable<T>, IComparer<T>)

Source:

Queryable.cs

Sorts the elements of a sequence in descending order.

C#

public static System.Linq.IOrderedQueryable<T> OrderDescending<T>(this System.Linq.IQueryable<T> source, System.Collections.Generic.IComparer<T> comparer);

Type Parameters

T

The type of the elements of source.

Parameters

source

IQueryable<T>

A sequence of values to order.

comparer

IComparer<T>

An IComparer<T> to compare elements.

Returns

IOrderedQueryable<T>

An IOrderedEnumerable<TElement> whose elements are sorted.

Exceptions

ArgumentNullException

source is null.

Remarks

This method has at least one parameter of type Expression<TDelegate> whose type argument is one of the Func<T,TResult> types. For these parameters, you can pass in a lambda expression and it will be compiled to an Expression<TDelegate>.

The Order<T>(IQueryable<T>) method generates a MethodCallExpression that represents calling Order<T>(IEnumerable<T>) itself as a constructed generic method. It then passes the MethodCallExpression to the CreateQuery<TElement>(Expression) method of the IQueryProvider represented by the Provider property of the source parameter. The result of calling CreateQuery<TElement>(Expression) is cast to type IOrderedQueryable<T> and returned.

The query behavior that occurs as a result of executing an expression tree that represents calling Order<T>(IEnumerable<T>) depends on the implementation of the source parameter. The expected behavior is that it sorts the elements of source by itself.

OrderDescending<T>(IQueryable<T>)

Source:

Queryable.cs

Sorts the elements of a sequence in descending order.

C#

public static System.Linq.IOrderedQueryable<T> OrderDescending<T>(this System.Linq.IQueryable<T> source);

Type Parameters

T

The type of the elements of source.

Parameters

source

IQueryable<T>

A sequence of values to order.

Returns

IOrderedQueryable<T>

An IOrderedEnumerable<TElement> whose elements are sorted.

Exceptions

ArgumentNullException

source is null.

Remarks

This method has at least one parameter of type Expression<TDelegate> whose type argument is one of the Func<T,TResult> types. For these parameters, you can pass in a lambda expression and it will be compiled to an Expression<TDelegate>.

The Order<T>(IQueryable<T>) method generates a MethodCallExpression that represents calling Order<T>(IEnumerable<T>) itself as a constructed generic method. It then passes the MethodCallExpression to the CreateQuery<TElement>(Expression) method of the IQueryProvider represented by the Provider property of the source parameter. The result of calling CreateQuery<TElement>(Expression) is cast to type IOrderedQueryable<T> and returned.

The query behavior that occurs as a result of executing an expression tree that represents calling Order<T>(IEnumerable<T>) depends on the implementation of the source parameter. The expected behavior is that it sorts the elements of source by itself.