HOW TO：使用反映提供者建立資料服務 (WCF Data Services)

WCF Data Services 可讓您定義以任意類別為基礎的資料模型，只要將這些類別公開為實作 IQueryable 介面的物件即可。 如需詳細資訊，請參閱資料服務提供者 (WCF 資料服務)。

範例

下列範例定義包含 Orders 及 Items 的資料模型。 實體容器類別 OrderItemData 具有兩個會傳回 IQueryable 介面的公開方法。 這些介面是 Orders 和 Items 實體類型的實體集。 Order 可以包括多個 Items，因此 Orders 實體類型具有一個 Items 導覽屬性，該屬性會傳回 Items 物件的集合。 OrderItemData 實體容器類別是 DataService 類別的泛型型別，OrderItems 資料服務即衍生於此。

注意：
由於本範例示範的是記憶體內部資料提供者，在目前物件執行個體外部所進行的變更將無法持續，因此實作 IUpdatable 介面並不會產生任何益處。如需實作 IUpdatable 介面的範例，請參閱 HOW TO：使用 LINQ to SQL 資料來源建立資料服務 (WCF Data Services)。

Imports System
Imports System.Collections.Generic
Imports System.Data.Services
Imports System.Data.Services.Common
Imports System.Linq

Namespace CustomDataServiceClient
    <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.All)
            config.SetEntitySetAccessRule("Items", EntitySetRights.All)
            config.DataServiceBehavior.MaxProtocolVersion = DataServiceProtocolVersion.V2
        End Sub
    End Class
End Namespace

using System;
using System.Collections.Generic;
using System.Data.Services;
using System.Data.Services.Common;
using System.Linq;

namespace CustomDataServiceClient
{
    [DataServiceKeyAttribute("OrderId")]
    public class Order
    {
        public int OrderId { get; set; }
        public string Customer { get; set; }
        public IList<Item> Items { get; set; }
    }
    [DataServiceKeyAttribute("Product")]
    public class Item
    {
        public string Product { get; set; }
        public int Quantity { get; set; }
    }
    public partial class OrderItemData
    {
        #region Populate Service Data
        static IList<Order> _orders;
        static IList<Item> _items;
        static OrderItemData()
        {
            _orders = new Order[]{
              new Order(){ OrderId=0, Customer = "Peter Franken", Items = new List<Item>()},
              new Order(){ OrderId=1, Customer = "Ana Trujillo", Items = new List<Item>()}};
            _items = new Item[]{
              new Item(){ Product="Chai", Quantity=10 },
              new Item(){ Product="Chang", Quantity=25 },
              new Item(){ Product="Aniseed Syrup", Quantity = 5 },
              new Item(){ 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]);
        }
        #endregion
        public IQueryable<Order> Orders
        {
            get { return _orders.AsQueryable<Order>(); }
        }
        public IQueryable<Item> Items
        {
            get { return _items.AsQueryable<Item>(); }
        }
    }
    public class OrderItems : DataService<OrderItemData>
    {
        // This method is called only once to initialize
        //service-wide policies.
        public static void InitializeService(IDataServiceConfiguration
                                             config)
        {
            config.SetEntitySetAccessRule("Orders", EntitySetRights.All);
            config.SetEntitySetAccessRule("Items", EntitySetRights.All);
        }
    }
}

另請參閱

工作

HOW TO：使用 LINQ to SQL 資料來源建立資料服務 (WCF Data Services)
HOW TO：使用 ADO.NET Entity Framework 資料來源建立資料服務 (WCF Data Services)

概念

資料服務提供者 (WCF 資料服務)