DbExpressionBuilder.GetRefKey Method (DbExpression)

.NET Framework (current version)
 
System_CAPS_noteNote

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

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

public static DbRefKeyExpression GetRefKey(
	this DbExpression argument
)

Parameters

argument
Type: System.Data.Common.CommandTrees.DbExpression

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

Return Value

Type: System.Data.Common.CommandTrees.DbRefKeyExpression

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

Exception Condition
ArgumentNullException

argument is null.

ArgumentException

argument does not have a reference result type.

.NET Framework
Available since 4.5
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