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DbExpressionBuilder.OrderBy Method (DbExpression, Func<DbExpression, DbExpression>)

.NET Framework 4.5

Creates a new DbSortExpression that sorts the given input set by the specified sort key, with ascending sort order and default collation.

Namespace:  System.Data.Common.CommandTrees.ExpressionBuilder
Assembly:  System.Data.Entity (in System.Data.Entity.dll)

public static DbSortExpression OrderBy(
	this DbExpression source,
	Func<DbExpression, DbExpression> sortKey


Type: System.Data.Common.CommandTrees.DbExpression

An expression that specifies the input set.

Type: System.Func<DbExpression, DbExpression>

A method that specifies how to derive the sort key expression given a member of the input set. This method must produce an expression with an order-comparable result type that provides the sort key definition.

Return Value

Type: System.Data.Common.CommandTrees.DbSortExpression
A new DbSortExpression that represents the order-by operation.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type DbExpression. 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).


source or sortKey is null.


The expression produced by sortKey is null.


source does not have a collection result type.


The expression produced by sortKey does not have an order-comparable result type.

.NET Framework

Supported in: 4.6, 4.5
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