DbExpressionBuilder.CreateRef Method

Definition

Namespace:

System.Data.Entity.Core.Common.CommandTrees.ExpressionBuilder

Assembly:

EntityFramework.dll

Overloads

CreateRef(EntitySet, IEnumerable<DbExpression>)	Creates a new DbRefExpression that encodes a reference to a specific entity based on key values.
CreateRef(EntitySet, DbExpression[])	Creates a new DbRefExpression that encodes a reference to a specific entity based on key values.
CreateRef(EntitySet, EntityType, IEnumerable<DbExpression>)	Creates a new DbRefExpression that encodes a reference to a specific entity of a given type based on key values.
CreateRef(EntitySet, EntityType, DbExpression[])	Creates a new DbRefExpression that encodes a reference to a specific entity of a given type based on key values.

CreateRef(EntitySet, IEnumerable<DbExpression>)

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

public static System.Data.Entity.Core.Common.CommandTrees.DbRefExpression CreateRef (this System.Data.Entity.Core.Metadata.Edm.EntitySet entitySet, System.Collections.Generic.IEnumerable<System.Data.Entity.Core.Common.CommandTrees.DbExpression> keyValues);

static member CreateRef : System.Data.Entity.Core.Metadata.Edm.EntitySet * seq<System.Data.Entity.Core.Common.CommandTrees.DbExpression> -> System.Data.Entity.Core.Common.CommandTrees.DbRefExpression

Parameters

entitySet

EntitySet

The entity set in which the referenced element resides.

keyValues

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.

Returns

DbRefExpression

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

Exceptions

ArgumentNullException

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

ArgumentException

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.

CreateRef(EntitySet, DbExpression[])

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

public static System.Data.Entity.Core.Common.CommandTrees.DbRefExpression CreateRef (this System.Data.Entity.Core.Metadata.Edm.EntitySet entitySet, params System.Data.Entity.Core.Common.CommandTrees.DbExpression[] keyValues);

static member CreateRef : System.Data.Entity.Core.Metadata.Edm.EntitySet * System.Data.Entity.Core.Common.CommandTrees.DbExpression[] -> System.Data.Entity.Core.Common.CommandTrees.DbRefExpression

Parameters

entitySet

EntitySet

The entity set in which the referenced element resides.

keyValues

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.

Returns

DbRefExpression

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

Exceptions

ArgumentNullException

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

ArgumentException

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.

CreateRef(EntitySet, EntityType, IEnumerable<DbExpression>)

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

public static System.Data.Entity.Core.Common.CommandTrees.DbRefExpression CreateRef (this System.Data.Entity.Core.Metadata.Edm.EntitySet entitySet, System.Data.Entity.Core.Metadata.Edm.EntityType entityType, System.Collections.Generic.IEnumerable<System.Data.Entity.Core.Common.CommandTrees.DbExpression> keyValues);

static member CreateRef : System.Data.Entity.Core.Metadata.Edm.EntitySet * System.Data.Entity.Core.Metadata.Edm.EntityType * seq<System.Data.Entity.Core.Common.CommandTrees.DbExpression> -> System.Data.Entity.Core.Common.CommandTrees.DbRefExpression

Parameters

entitySet

EntitySet

The entity set in which the referenced element resides.

entityType

EntityType

The specific type of the referenced entity. This must be an entity type from the same hierarchy as the entity set's element type.

keyValues

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.

Returns

DbRefExpression

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

Exceptions

ArgumentNullException

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

ArgumentException

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.

CreateRef(EntitySet, EntityType, DbExpression[])

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

public static System.Data.Entity.Core.Common.CommandTrees.DbRefExpression CreateRef (this System.Data.Entity.Core.Metadata.Edm.EntitySet entitySet, System.Data.Entity.Core.Metadata.Edm.EntityType entityType, params System.Data.Entity.Core.Common.CommandTrees.DbExpression[] keyValues);

static member CreateRef : System.Data.Entity.Core.Metadata.Edm.EntitySet * System.Data.Entity.Core.Metadata.Edm.EntityType * System.Data.Entity.Core.Common.CommandTrees.DbExpression[] -> System.Data.Entity.Core.Common.CommandTrees.DbRefExpression

Parameters

entitySet

EntitySet

The entity set in which the referenced element resides.

entityType

EntityType

The specific type of the referenced entity. This must be an entity type from the same hierarchy as the entity set's element type.

keyValues

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.

Returns

DbRefExpression

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

Exceptions

ArgumentNullException

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

ArgumentException

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.