DbExpressionBuilder.ThenByDescending Method
Creates a new DbSortExpression that with a sort order that includes the sort order of the given order input set together with the specified sort key in descending sort order and with default collation.
Assembly: EntityFramework (in EntityFramework.dll)
Name | Description | |
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![]() ![]() | ThenByDescending(DbSortExpression, Func<DbExpression, DbExpression>) | Creates a new DbSortExpression that with a sort order that includes the sort order of the given order input set together with the specified sort key in descending sort order and with default collation. |
![]() ![]() | ThenByDescending(DbSortExpression, Func<DbExpression, DbExpression>, String) | Creates a new DbSortExpression that with a sort order that includes the sort order of the given order input set together with the specified sort key in descending sort order and with the specified collation. |
DbExpressionBuilder.ThenByDescending Method (DbSortExpression, Func<DbExpression, DbExpression>)
Creates a new DbSortExpression that with a sort order that includes the sort order of the given order input set together with the specified sort key in descending sort order and with default collation.
public static DbSortExpression ThenByDescending( this DbSortExpression source, Func<DbExpression, DbExpression> sortKey )
Parameters
- source
-
Type:
System.Data.Entity.Core.Common.CommandTrees.DbSortExpression
A DbSortExpression that specifies the ordered input set.
- sortKey
-
Type:
System.Func<DbExpression, DbExpression>
A method that specifies how to derive the additional 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.Entity.Core.Common.CommandTrees.DbSortExpressionA new DbSortExpression that represents the new overall order-by operation.
Exception | Condition |
---|---|
ArgumentNullException | source or sortKey is null. |
ArgumentNullException | The expression produced by sortKey is null. |
ArgumentException | source does not have a collection result type. |
ArgumentException | The expression produced by sortKey does not have an order-comparable result type. |
DbExpressionBuilder.ThenByDescending Method (DbSortExpression, Func<DbExpression, DbExpression>, String)
Creates a new DbSortExpression that with a sort order that includes the sort order of the given order input set together with the specified sort key in descending sort order and with the specified collation.
public static DbSortExpression ThenByDescending( this DbSortExpression source, Func<DbExpression, DbExpression> sortKey, string collation )
Parameters
- source
-
Type:
System.Data.Entity.Core.Common.CommandTrees.DbSortExpression
A DbSortExpression that specifies the ordered input set.
- sortKey
-
Type:
System.Func<DbExpression, DbExpression>
A method that specifies how to derive the additional 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.
- collation
-
Type:
System.String
The collation to sort under.
Return Value
Type: System.Data.Entity.Core.Common.CommandTrees.DbSortExpressionA new DbSortExpression that represents the new overall order-by operation.
Exception | Condition |
---|---|
ArgumentNullException | source, sortKey or collation is null. |
ArgumentNullException | The expression produced by sortKey is null. |
ArgumentException | source does not have a collection result type. |
ArgumentException | The expression produced by sortKey does not have an order-comparable string result type. |
ArgumentOutOfRangeException | collation is empty or contains only space characters. |