Export (0) Print
Expand All

InheritanceMappingAttribute Class

Maps an inheritance hierarchy in a LINQ to SQL application.

System.Object
  System.Attribute
    System.Data.Linq.Mapping.InheritanceMappingAttribute

Namespace:  System.Data.Linq.Mapping
Assembly:  System.Data.Linq (in System.Data.Linq.dll)

'Declaration
<AttributeUsageAttribute(AttributeTargets.Class, AllowMultiple := True, Inherited := False)> _
Public NotInheritable Class InheritanceMappingAttribute _
	Inherits Attribute

The InheritanceMappingAttribute type exposes the following members.

  NameDescription
Public methodSupported by Silverlight for Windows PhoneInheritanceMappingAttributeInitializes a new instance of the InheritanceMappingAttribute class.
Top

  NameDescription
Public propertySupported by Silverlight for Windows PhoneCodeGets or sets the discriminator code value in a mapped inheritance hierarchy.
Public propertySupported by Silverlight for Windows PhoneIsDefaultGets or sets whether an object of this type in instantiated when the discriminator value does not match a specified value.
Public propertySupported by Silverlight for Windows PhoneTypeGets or sets the type of the class in the hierarchy.
Top

  NameDescription
Public methodSupported by Silverlight for Windows PhoneEqualsInfrastructure. Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute.)
Protected methodSupported by Silverlight for Windows PhoneFinalizeAllows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)
Public methodSupported by Silverlight for Windows PhoneGetHashCodeReturns the hash code for this instance. (Inherited from Attribute.)
Public methodSupported by Silverlight for Windows PhoneGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodSupported by Silverlight for Windows PhoneMatchWhen overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute.)
Protected methodSupported by Silverlight for Windows PhoneMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodSupported by Silverlight for Windows PhoneToStringReturns a string that represents the current object. (Inherited from Object.)
Top

One InheritanceMappingAttribute is specified per mapped class.

Note the following when you map inheritance hierarchies:

  • All classes in a hierarchy must be mapped to a single table.

  • The table for an inheritance hierarchy must be declared on the mapped type that is at the top of the hierarchy. You cannot specify the table or mapping attributes in a class that is derived from the top class.

  • You can use an interface in a hierarchy, but LINQ does not map it.

  • You can skip a class in the hierarchy when you map classes, but you can query against mapped classes only.

For correct materialization, discriminator code values must be unique and match the values in the database. A row with a discriminator code value that does not exactly match (even by casing) instantiates the class by using IsDefault set to true.

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Community Additions

ADD
Show:
© 2014 Microsoft