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DbExpressionBuilder.GetRefKey Method

.NET Framework 4.6 and 4.5

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.

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).

ExceptionCondition
ArgumentNullException

argument is null.

ArgumentException

argument does not have a reference result type.

.NET Framework

Supported in: 4.6, 4.5
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