EntityTypeConfiguration<TEntityType>.HasOptional Method

 

Namespace:   System.Web.Http.OData.Builder
Assembly:  System.Web.Http.OData (in System.Web.Http.OData.dll)

Overload List

	Name	Description
	HasOptional<TTargetEntity>(Expression<Func<TEntityType, TTargetEntity>>)	Configures an optional relationship from this entity type.
	HasOptional<TTargetEntity>(Expression<Func<TEntityType, TTargetEntity>>, Expression<Func<TEntityType, TTargetEntity, Boolean>>)	Configures an optional relationship with referential constraint from this entity type.

See Also

EntityTypeConfiguration<TEntityType> Class
System.Web.Http.OData.Builder Namespace

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EntityTypeConfiguration<TEntityType>.HasOptional<TTargetEntity> Method (Expression<Func<TEntityType, TTargetEntity>>)

Configures an optional relationship from this entity type.

Syntax

public NavigationPropertyConfiguration HasOptional<TTargetEntity>(
    Expression<Func<TEntityType, TTargetEntity>> navigationPropertyExpression
)
where TTargetEntity : class

public:
generic<typename TTargetEntity>
where TTargetEntity : ref class
NavigationPropertyConfiguration^ HasOptional(
    Expression<Func<TEntityType, TTargetEntity>^>^ navigationPropertyExpression
)

member HasOptional<'TTargetEntity when 'TTargetEntity : not struct> : 
        navigationPropertyExpression:Expression<Func<'TEntityType, 'TTargetEntity>> -> NavigationPropertyConfiguration

Public Function HasOptional(Of TTargetEntity As Class) (
    navigationPropertyExpression As Expression(Of Func(Of TEntityType, TTargetEntity))
) As NavigationPropertyConfiguration

Parameters

• navigationPropertyExpression
  Type: System.Linq.Expressions.Expression<Func<TEntityType, TTargetEntity>>

  A lambda expression representing the navigation property for the relationship. For example, in C# t => t.MyProperty and in Visual Basic .NET Function(t) t.MyProperty.

Return Value

Type: System.Web.Http.OData.Builder.NavigationPropertyConfiguration

A configuration object that can be used to further configure the relationship.

Type Parameters

• TTargetEntity
  The type of the entity at the other end of the relationship.

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EntityTypeConfiguration<TEntityType>.HasOptional<TTargetEntity> Method (Expression<Func<TEntityType, TTargetEntity>>, Expression<Func<TEntityType, TTargetEntity, Boolean>>)

Configures an optional relationship with referential constraint from this entity type.

Syntax

public NavigationPropertyConfiguration HasOptional<TTargetEntity>(
    Expression<Func<TEntityType, TTargetEntity>> navigationPropertyExpression,
    Expression<Func<TEntityType, TTargetEntity, bool>> referentialConstraintExpression
)
where TTargetEntity : class

public:
generic<typename TTargetEntity>
where TTargetEntity : ref class
NavigationPropertyConfiguration^ HasOptional(
    Expression<Func<TEntityType, TTargetEntity>^>^ navigationPropertyExpression,
    Expression<Func<TEntityType, TTargetEntity, bool>^>^ referentialConstraintExpression
)

member HasOptional<'TTargetEntity when 'TTargetEntity : not struct> : 
        navigationPropertyExpression:Expression<Func<'TEntityType, 'TTargetEntity>> *
        referentialConstraintExpression:Expression<Func<'TEntityType, 'TTargetEntity, bool>> -> NavigationPropertyConfiguration

Public Function HasOptional(Of TTargetEntity As Class) (
    navigationPropertyExpression As Expression(Of Func(Of TEntityType, TTargetEntity)),
    referentialConstraintExpression As Expression(Of Func(Of TEntityType, TTargetEntity, Boolean))
) As NavigationPropertyConfiguration

Parameters

• navigationPropertyExpression
  Type: System.Linq.Expressions.Expression<Func<TEntityType, TTargetEntity>>

  A lambda expression representing the navigation property for the relationship. For example, in C# t => t.Customer and in Visual Basic .NET Function(t) t.Cusomter.

• referentialConstraintExpression
  Type: System.Linq.Expressions.Expression<Func<TEntityType, TTargetEntity, Boolean>>

  A lambda expression representing the referential constraint. For example, in C# (o, c) => o.CustomerId == c.Id and in Visual Basic .NET Function(o, c) o.CustomerId == c.Id.

Return Value

Type: System.Web.Http.OData.Builder.NavigationPropertyConfiguration

A configuration object that can be used to further configure the relationship.

Type Parameters

• TTargetEntity
  The type of the entity at the other end of the relationship.

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