EntityPropertyMappingAttribute Class
Attribute that specifies a custom mapping between properties of an entity type and elements of an entry in a feed returned by WCF Data Services.
Assembly: System.Data.Services.Client (in System.Data.Services.Client.dll)
| Name | Description | |
|---|---|---|
![]() | EntityPropertyMappingAttribute(String, String, String, String, Boolean) | Creates an instance of the EntityPropertyMappingAttribute to map a property to a custom feed element. |
![]() | EntityPropertyMappingAttribute(String, SyndicationItemProperty, SyndicationTextContentKind, Boolean) | Creates a new instance of the EntityPropertyMappingAttribute. |
| Name | Description | |
|---|---|---|
![]() | KeepInContent | Gets a Boolean value that indicates whether a property value should be repeated both in the content section of the feed and in the mapped location. |
![]() | SourcePath | Gets the name of the property of the syndication item that will be mapped to the specified element of the feed. |
![]() | TargetNamespacePrefix | Gets a string value that, together with TargetNamespaceUri, specifies the namespace in which the TargetPath element exists. |
![]() | TargetNamespaceUri | Gets a string value that specifies the namespace URI of the element specified by the TargetPath property. |
![]() | TargetPath | Gets the name of the custom target in the feed to which the property is mapped. |
![]() | TargetSyndicationItem | Gets a property on the SyndicationItem class. |
![]() | TargetTextContentKind | Gets the type of content of the property mapped by EntityPropertyMappingAttribute. |
![]() | TypeId |
| Name | Description | |
|---|---|---|
![]() | Equals(Object) | This API supports the product infrastructure and is not intended to be used directly from your code. Returns a value that indicates whether this instance is equal to a specified object.(Inherited from Attribute.) |
![]() | GetHashCode() | Returns the hash code for this instance.(Inherited from Attribute.) |
![]() | GetType() | |
![]() | IsDefaultAttribute() | When overridden in a derived class, indicates whether the value of this instance is the default value for the derived class.(Inherited from Attribute.) |
![]() | Match(Object) | When overridden in a derived class, returns a value that indicates whether this instance equals a specified object.(Inherited from Attribute.) |
![]() | ToString() | Returns a string that represents the current object.(Inherited from Object.) |
| Name | Description | |
|---|---|---|
![]() ![]() | _Attribute.GetIDsOfNames(Guid, IntPtr, UInt32, UInt32, IntPtr) | Maps a set of names to a corresponding set of dispatch identifiers.(Inherited from Attribute.) |
![]() ![]() | _Attribute.GetTypeInfo(UInt32, UInt32, IntPtr) | Retrieves the type information for an object, which can be used to get the type information for an interface.(Inherited from Attribute.) |
![]() ![]() | _Attribute.GetTypeInfoCount(UInt32) | Retrieves the number of type information interfaces that an object provides (either 0 or 1).(Inherited from Attribute.) |
![]() ![]() | _Attribute.Invoke(UInt32, Guid, UInt32, Int16, IntPtr, IntPtr, IntPtr, IntPtr) | Provides access to properties and methods exposed by an object.(Inherited from Attribute.) |
The EntityPropertyMappingAttribute is used to define custom feed mapping in the data model of a reflection provider. This attribute is also applied to generated client data service classes when the metadata used to generate the classes indicates that custom feed mappings are defined in the data model. This information is necessary to make sure that the client can create and consume messages that support custom feeds. For more information, see Feed Customization (WCF Data Services).
In the following example, both properties of the Order type are mapped to existing feed elements. The Product property of the Item type is mapped to a custom feed attribute in a separate namespace.
Imports System Imports System.Collections.Generic Imports System.Data.Services Imports System.Data.Services.Common Imports System.Linq Namespace CustomDataService <EntityPropertyMappingAttribute("Customer", _ SyndicationItemProperty.AuthorName, _ SyndicationTextContentKind.Plaintext, True)> _ <EntityPropertyMapping("OrderId", _ SyndicationItemProperty.Title, _ SyndicationTextContentKind.Plaintext, False)> _ <DataServiceKeyAttribute("OrderId")> _ Public Class Order Private _orderId As Integer Private _customer As String Private _items As IList(Of Item) Public Property OrderId() As Integer Get Return _orderId End Get Set(ByVal value As Integer) _orderId = value End Set End Property Public Property Customer() As String Get Return _customer End Get Set(ByVal value As String) _customer = value End Set End Property Public Property Items() As IList(Of Item) Get Return _items End Get Set(ByVal value As IList(Of Item)) _items = value End Set End Property End Class <EntityPropertyMappingAttribute("Product", "productname", _ "orders", "http://schema.examples.microsoft.com/dataservices", True)> _ <DataServiceKeyAttribute("Product")> _ Public Class Item Private _product As String Private _quantity As Integer Public Property Product() As String Get Return _product End Get Set(ByVal value As String) _product = value End Set End Property Public Property Quantity() As Integer Get Return _quantity End Get Set(ByVal value As Integer) _quantity = value End Set End Property End Class Partial Public Class OrderItemData #Region "Populate Service Data" Shared _orders As IList(Of Order) Shared _items As IList(Of Item) Sub New() _orders = New Order() { _ New Order() With {.OrderId = 0, .Customer = "Peter Franken", .Items = New List(Of Item)()}, _ New Order() With {.OrderId = 1, .Customer = "Ana Trujillo", .Items = New List(Of Item)()}} _items = New Item() { _ New Item() With {.Product = "Chai", .Quantity = 10}, _ New Item() With {.Product = "Chang", .Quantity = 25}, _ New Item() With {.Product = "Aniseed Syrup", .Quantity = 5}, _ New Item() With {.Product = "Chef Anton's Cajun Seasoning", .Quantity = 30}} _orders(0).Items.Add(_items(0)) _orders(0).Items.Add(_items(1)) _orders(1).Items.Add(_items(2)) _orders(1).Items.Add(_items(3)) End Sub #End Region Public ReadOnly Property Orders() As IQueryable(Of Order) Get Return _orders.AsQueryable() End Get End Property Public ReadOnly Property Items() As IQueryable(Of Item) Get Return _items.AsQueryable() End Get End Property End Class Public Class OrderItems Inherits DataService(Of OrderItemData) ' This method is called only once to initialize ' service-wide policies. Shared Sub InitializeService(ByVal config As DataServiceConfiguration) config.SetEntitySetAccessRule("Orders", _ EntitySetRights.AllRead _ Or EntitySetRights.AllWrite) config.SetEntitySetAccessRule("Items", _ EntitySetRights.AllRead _ Or EntitySetRights.AllWrite) config.DataServiceBehavior.MaxProtocolVersion = DataServiceProtocolVersion.V2 End Sub End Class End Namespace
The previous example returns the following result for the URI http://myservice/OrderItems.svc/Orders(0)?$expand=Items.
<entry xml:base="http://localhost:12345/OrderItems.svc/" xmlns:d="http://schemas.microsoft.com/ado/2007/08/dataservices" xmlns:m="http://schemas.microsoft.com/ado/2007/08/dataservices/metadata" xmlns="http://www.w3.org/2005/Atom"> <id>http://localhost:12345/OrderItems.svc/Orders(0)</id> <title type="text">0</title> <updated>2009-07-25T21:12:30Z</updated> <author> <name>Peter Franken</name> </author> <link rel="edit" title="Order" href="Orders(0)" /> <link rel="http://schemas.microsoft.com/ado/2007/08/dataservices/related/Items" type="application/atom+xml;type=feed" title="Items" href="Orders(0)/Items"> <m:inline> <feed> <title type="text">Items</title> <id>http://localhost:12345/OrderItems.svc/Orders(0)/Items</id> <updated>2009-07-25T21:12:30Z</updated> <link rel="self" title="Items" href="Orders(0)/Items" /> <entry> <id>http://localhost:12345/OrderItems.svc/Items('Chai')</id> <title type="text" /> <updated>2009-07-25T21:12:30Z</updated> <author> <name /> </author> <link rel="edit" title="Item" href="Items('Chai')" /> <category term="CustomDataService.Item" scheme="http://schemas.microsoft.com/ado/2007/08/dataservices/scheme" /> <content type="application/xml"> <m:properties> <d:Product>Chai</d:Product> <d:Quantity m:type="Edm.Int32">10</d:Quantity> </m:properties> </content> <orders:productname xmlns:orders="http://schema.examples.microsoft.com/dataservices">Chai</orders:productname> </entry> <entry> <id>http://localhost:12345/OrderItems.svc/Items('Chang')</id> <title type="text" /> <updated>2009-07-25T21:12:30Z</updated> <author> <name /> </author> <link rel="edit" title="Item" href="Items('Chang')" /> <category term="CustomDataService.Item" scheme="http://schemas.microsoft.com/ado/2007/08/dataservices/scheme" /> <content type="application/xml"> <m:properties> <d:Product>Chang</d:Product> <d:Quantity m:type="Edm.Int32">25</d:Quantity> </m:properties> </content> <orders:productname xmlns:orders="http://schema.examples.microsoft.com/dataservices">Chang</orders:productname> </entry> </feed> </m:inline> </link> <category term="CustomDataService.Order" scheme="http://schemas.microsoft.com/ado/2007/08/dataservices/scheme" /> <content type="application/xml"> <m:properties> <d:Customer>Peter Franken</d:Customer> </m:properties> </content> </entry>
Available since 3.5
Silverlight
Available since 4.0
Any public static ( Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.



