DbExpressionBuilder.CreateRef Method (EntitySet, IEnumerable<DbExpression>)

.NET Framework (current version)

The .NET API Reference documentation has a new home. Visit the .NET API Browser on docs.microsoft.com to see the new experience.

Creates a new DbRefExpression that encodes a reference to a specific entity based on key values.

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

public static DbRefExpression CreateRef(
	this EntitySet entitySet,
	IEnumerable<DbExpression> keyValues


Type: System.Data.Metadata.Edm.EntitySet

The entity set in which the referenced element resides.

Type: System.Collections.Generic.IEnumerable<DbExpression>

A collection of DbExpressions that provide the key values. These expressions must match (in number, type, and order) the key properties of the referenced entity type.

Return Value

Type: System.Data.Common.CommandTrees.DbRefExpression

A new DbRefExpression that references the element with the specified key values in the given entity set.

Exception Condition

entitySet is null, or keyValues is null or contains null.


The count of keyValues does not match the count of key members declared by the entitySet’s element type, or keyValues contains an expression with a result type that is not compatible with the type of the corresponding key member.

.NET Framework
Available since 4.5
Return to top