DbExpressionBuilder.GetRefKey(DbExpression) Method

Reference

Definition

Namespace:: System.Data.Common.CommandTrees.ExpressionBuilder

Assembly:: System.Data.Entity.dll

Important

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Creates a new DbRefKeyExpression that retrieves the key values of the specified reference in structural form.

public:
[System::Runtime::CompilerServices::Extension]
 static System::Data::Common::CommandTrees::DbRefKeyExpression ^ GetRefKey(System::Data::Common::CommandTrees::DbExpression ^ argument);

public static System.Data.Common.CommandTrees.DbRefKeyExpression GetRefKey (this System.Data.Common.CommandTrees.DbExpression argument);

static member GetRefKey : System.Data.Common.CommandTrees.DbExpression -> System.Data.Common.CommandTrees.DbRefKeyExpression

<Extension()>
Public Function GetRefKey (argument As DbExpression) As DbRefKeyExpression

Parameters

argument: DbExpression

The expression that provides the reference. This expression must have a reference Type with an Entity element type.

Returns

DbRefKeyExpression

A new DbRefKeyExpression that retrieves the key values of the specified reference.

Exceptions

ArgumentNullException

argument is null.

ArgumentException

argument does not have a reference result type.

Applies to