Nota
L'accesso a questa pagina richiede l'autorizzazione. È possibile provare ad accedere o modificare le directory.
L'accesso a questa pagina richiede l'autorizzazione. È possibile provare a modificare le directory.
Quando si utilizzano classi di dati personalizzate con Entity Data Model (EDM), è necessario aggiornare le classi di dati personalizzate in modo che ereditino da EntityObject e ComplexObject. È inoltre necessario applicare gli attributi EDM per il mapping delle proprietà e delle classi personalizzate ai tipi di entità e ai tipi complessi definiti nel file CSDL (Conceptual Schema Definition Language). Per ulteriori informazioni, vedere Procedura: eseguire il mapping di oggetti personalizzati alle entità (Entity Framework).
Anziché ereditare da EntityObject o ComplexObject, è anche possibile implementare interfacce delle classi di dati personalizzate. Per ulteriori informazioni, vedere Implementazione di interfacce di classi di dati personalizzate (Entity Framework).
Per ereditare da EntityObject
Modificare la definizione di ogni classe di dati personalizzata in modo che erediti da EntityObject, come nell'esempio seguente:
<EdmEntityTypeAttribute(NamespaceName:="Microsoft.Samples.Edm", Name:="Order")> _ Public Class Order Inherits EntityObject[EdmEntityTypeAttribute(NamespaceName="Microsoft.Samples.Edm",Name="Order")] public class Order : EntityObjectNelle proprietà scalari impostabili di ogni classe di dati aggiungere una chiamata a ReportPropertyChanging prima di impostare il valore della proprietà e aggiungere una chiamata a ReportPropertyChanged dopo che la proprietà è stata impostata. Questa operazione è illustrata nell'esempio seguente:
Set(ByVal value As Integer) ReportPropertyChanging("OrderId") _orderId = value ReportPropertyChanged("OrderId") End Setset { ReportPropertyChanging("OrderId"); _orderId = value; ReportPropertyChanged("OrderId"); }
Per ereditare da ComplexObject
Modificare la definizione di ogni classe di dati complessa personalizzata in modo che erediti da ComplexObject, come nell'esempio seguente:
<Global.System.Data.Objects.DataClasses.EdmComplexTypeAttribute( _ NamespaceName:="Microsoft.Samples.Edm", Name:="OrderInfo")> _ Partial Public Class OrderInfo Inherits Global.System.Data.Objects.DataClasses.ComplexObject[EdmComplexTypeAttribute(NamespaceName = "Microsoft.Samples.Edm", Name = "OrderInfo")] public partial class OrderInfo : ComplexObjectNelle proprietà scalari impostabili di ogni classe di dati complessa aggiungere una chiamata a ReportPropertyChanging prima di impostare il valore della proprietà e aggiungere una chiamata a ReportPropertyChanged dopo che la proprietà è stata impostata. Questa operazione è illustrata nell'esempio seguente:
' Validate the value before setting it. If (value <> Nothing) AndAlso value.Length > 25 Then Throw New ApplicationException(String.Format( _ My.Resources.propertyNotValidString, _ "PurchaseOrder", "25")) End If If _purchaseOrder <> value Then ReportPropertyChanging("PurchaseOrder") _purchaseOrder = value ReportPropertyChanged("PurchaseOrder") End If// Validate the value before setting it. if ((value != null) && value.Length > 25) { throw new ApplicationException(string.Format( Properties.Resources.propertyNotValidString, new string[3] { value, "PurchaseOrder", "25" })); } if (_purchaseOrder != value) { ReportPropertyChanging("PurchaseOrder"); _purchaseOrder = value; ReportPropertyChanged("PurchaseOrder"); }
Esempio
In questo esempio sono illustrate le classi di dati personalizzate Order e LineItem e la classe di dati complessa OrderInfo. Queste classi personalizzate sono mappate alle tabelle SalesOrderHeader e SalesOrderDetail nel database AdventureWorks. Le classi Order e LineItem ereditano da EntityObject, mentre la classe di dati complessa OrderInfo eredita da ComplexObject.
Option Explicit On
Option Strict On
Imports System
Imports System.Data.SqlTypes
Imports System.Collections.Generic
Imports System.Text
Imports System.Data
Imports System.Data.Objects.DataClasses
Imports System.Data.Metadata.Edm
Imports Microsoft.Samples.Edm
<Assembly: EdmSchemaAttribute()>
<Assembly: EdmRelationshipAttribute("Microsoft.Samples.Edm", _
"FK_LineItem_Order_OrderId", "Order", _
RelationshipMultiplicity.One, GetType(Order), "LineItem", _
RelationshipMultiplicity.Many, GetType(LineItem))>
Namespace Microsoft.Samples.Edm
<EdmEntityTypeAttribute(NamespaceName:="Microsoft.Samples.Edm", Name:="Order")> _
Public Class Order
Inherits EntityObject
' Define private property variables.
Private _orderId As Integer
Private _orderDate As DateTime
Private _dueDate As DateTime
Private _shipDate As DateTime
Private _status As Byte
Private _customer As Integer
Private _subTotal As Decimal
Private _tax As Decimal
Private _freight As Decimal
Private _totalDue As Decimal
Private _extendedInfo As OrderInfo
'Default Constructor.
Sub New()
End Sub
' Public properties of the Order object.
<EdmScalarPropertyAttribute(EntityKeyProperty:=True, IsNullable:=False)> _
Public Property OrderId() As Integer
Get
Return _orderId
End Get
Set(ByVal value As Integer)
ReportPropertyChanging("OrderId")
_orderId = value
ReportPropertyChanged("OrderId")
End Set
End Property
' Navigation property that returns a collection of line items.
<EdmRelationshipNavigationPropertyAttribute("Microsoft.Samples.Edm", _
"FK_LineItem_Order_OrderId", "LineItem")> _
Public ReadOnly Property LineItem() As EntityCollection(Of LineItem)
Get
Return CType(Me, IEntityWithRelationships).RelationshipManager _
.GetRelatedCollection(Of LineItem) _
("FK_LineItem_Order_OrderId", "LineItem")
End Get
End Property
<EdmScalarPropertyAttribute(IsNullable:=False)> _
Public Property OrderDate() As Date
Get
Return _orderDate
End Get
Set(ByVal value As DateTime)
ReportPropertyChanging("OrderDate")
_orderDate = value
ReportPropertyChanged("OrderDate")
End Set
End Property
<EdmScalarPropertyAttribute(IsNullable:=False)> _
Public Property DueDate() As Date
Get
Return _dueDate
End Get
Set(ByVal value As Date)
ReportPropertyChanging("DueDate")
_dueDate = value
ReportPropertyChanged("DueDate")
End Set
End Property
<EdmScalarPropertyAttribute()> _
Public Property ShipDate() As Date
Get
Return _shipDate
End Get
Set(ByVal value As Date)
ReportPropertyChanging("ShipDate")
_shipDate = value
ReportPropertyChanged("ShipDate")
End Set
End Property
<EdmScalarPropertyAttribute(IsNullable:=False)> _
Public Property Status() As Byte
Get
Return _status
End Get
Set(ByVal value As Byte)
If _status <> value Then
ReportPropertyChanging("Status")
_status = value
ReportPropertyChanged("Status")
End If
End Set
End Property
<EdmScalarPropertyAttribute(IsNullable:=False)> _
Public Property Customer() As Integer
Get
Return _customer
End Get
Set(ByVal value As Integer)
ReportPropertyChanging("Customer")
_customer = value
ReportPropertyChanged("Customer")
End Set
End Property
<EdmScalarPropertyAttribute(IsNullable:=False)> _
Public Property SubTotal() As Decimal
Get
Return _subTotal
End Get
Set(ByVal value As Decimal)
If _subTotal <> value Then
' Validate the value before setting it.
If value < 0 Then
Throw New ApplicationException(String.Format( _
My.Resources.propertyNotValidNegative, _
value.ToString, "SubTotal"))
End If
ReportPropertyChanging("SubTotal")
_subTotal = value
ReportPropertyChanged("SubTotal")
' Recalculate the order total.
CalculateOrderTotal()
End If
End Set
End Property
<EdmScalarPropertyAttribute(IsNullable:=False)> _
Public Property TaxAmt() As Decimal
Get
Return _tax
End Get
Set(ByVal value As Decimal)
' Validate the value before setting it.
If value < 0 Then
Throw New ApplicationException(String.Format( _
My.Resources.propertyNotValidNegative, _
value.ToString(), "Tax"))
End If
ReportPropertyChanging("TaxAmt")
_tax = value
ReportPropertyChanged("TaxAmt")
' Recalculate the order total.
CalculateOrderTotal()
End Set
End Property
<EdmScalarPropertyAttribute(IsNullable:=False)> _
Public Property Freight() As Decimal
Get
Return _freight
End Get
Set(ByVal value As Decimal)
If _freight <> value Then
' Validate the value before setting it.
If value < 0 Then
Throw New ApplicationException(String.Format( _
My.Resources.propertyNotValidNegative, _
value.ToString(), "Freight"))
End If
ReportPropertyChanging("Freight")
_freight = value
ReportPropertyChanging("Freight")
' Recalculate the order total.
CalculateOrderTotal()
End If
End Set
End Property
Public ReadOnly Property TotalDue() As Decimal
Get
Return _totalDue
End Get
End Property
<EdmComplexPropertyAttribute()> _
Public Property ExtendedInfo() As OrderInfo
Get
Return _extendedInfo
End Get
Set(ByVal value As OrderInfo)
ReportPropertyChanging("ExtendedInfo")
_extendedInfo = value
ReportPropertyChanged("ExtendedInfo")
End Set
End Property
Private Sub CalculateOrderTotal()
' Update the total due as a sum of the other cost properties.
_totalDue = _subTotal + _tax + _freight
End Sub
End Class
<Global.System.Data.Objects.DataClasses.EdmComplexTypeAttribute( _
NamespaceName:="Microsoft.Samples.Edm", Name:="OrderInfo")> _
Partial Public Class OrderInfo
Inherits Global.System.Data.Objects.DataClasses.ComplexObject
Private _orderNumber As String
Private _purchaseOrder As String
Private _accountNumber As String
Private _comment As String
<EdmScalarPropertyAttribute(IsNullable:=False)> _
Public Property OrderNumber() As String
Get
Return _orderNumber
End Get
Set(ByVal value As String)
' Validate the value before setting it.
If value.Length > 25 Then
Throw New ApplicationException(String.Format( _
My.Resources.propertyNotValidString, _
"OrderNumber", "25"))
End If
ReportPropertyChanging("OrderNumber")
_orderNumber = value
ReportPropertyChanged("OrderNumber")
End Set
End Property
<EdmScalarPropertyAttribute()> _
Public Property PurchaseOrder() As String
Get
Return _purchaseOrder
End Get
Set(ByVal value As String)
' Validate the value before setting it.
If (value <> Nothing) AndAlso value.Length > 25 Then
Throw New ApplicationException(String.Format( _
My.Resources.propertyNotValidString, _
"PurchaseOrder", "25"))
End If
If _purchaseOrder <> value Then
ReportPropertyChanging("PurchaseOrder")
_purchaseOrder = value
ReportPropertyChanged("PurchaseOrder")
End If
End Set
End Property
<EdmScalarPropertyAttribute()> _
Public Property AccountNumber() As String
Get
Return _accountNumber
End Get
Set(ByVal value As String)
' Validate the value before setting it.
If (value <> Nothing) AndAlso value.Length > 15 Then
Throw New ApplicationException(String.Format( _
My.Resources.propertyNotValidString, _
"AccountNumber", "15"))
End If
ReportPropertyChanging("AccountNumber")
_accountNumber = value
ReportPropertyChanged("AccountNumber")
End Set
End Property
<EdmScalarPropertyAttribute()> _
Public Property Comment() As String
Get
Return _comment
End Get
Set(ByVal value As String)
' Validate the value before setting it.
If (value <> Nothing) AndAlso value.Length > 128 Then
Throw New ApplicationException(String.Format( _
My.Resources.propertyNotValidString, _
"Comment", "128"))
End If
If _comment <> value Then
ReportPropertyChanging("Comment")
_comment = value
ReportPropertyChanged("Comment")
End If
End Set
End Property
End Class
<EdmEntityTypeAttribute(NamespaceName:="Microsoft.Samples.Edm", _
Name:="LineItem")> _
Public Class LineItem
Inherits EntityObject
' Define private property variables.
Dim _lineItemId As Integer
Dim _trackingNumber As String
Dim _quantity As Short
Dim _product As Integer
Dim _price As Decimal
Dim _discount As Decimal
Dim _total As Decimal
Sub New()
End Sub
' Defines a navigation property to the Order class.
<EdmRelationshipNavigationPropertyAttribute("Microsoft.Samples.Edm", _
"FK_LineItem_Order_OrderId", "Order")> _
Public Property Order() As Order
Get
Return CType(Me, _
IEntityWithRelationships).RelationshipManager _
.GetRelatedReference(Of Order) _
("FK_LineItem_Order_OrderId", "Order").Value
End Get
Set(ByVal value As Order)
CType(Me, _
IEntityWithRelationships).RelationshipManager _
.GetRelatedReference(Of Order) _
("FK_LineItem_Order_OrderId", "Order").Value = value
End Set
End Property
<EdmScalarPropertyAttribute(EntityKeyProperty:=True, IsNullable:=False)> _
Public Property LineItemId() As Integer
Get
Return _lineItemId
End Get
Set(ByVal value As Integer)
ReportPropertyChanging("LineItemId")
_lineItemId = value
ReportPropertyChanged("LineItemId")
End Set
End Property
<EdmScalarPropertyAttribute()> _
Public Property TrackingNumber() As String
Get
Return _trackingNumber
End Get
Set(ByVal value As String)
If _trackingNumber <> value Then
' Validate the value before setting it.
If value.Length > 25 Then
Throw New ApplicationException(String.Format( _
My.Resources.propertyNotValidString, _
"TrackingNumber", "25"))
End If
ReportPropertyChanging("TrackingNumber")
_trackingNumber = value
ReportPropertyChanged("TrackingNumber")
End If
End Set
End Property
<EdmScalarPropertyAttribute(IsNullable:=False)> _
Public Property Quantity() As Short
Get
Return _quantity
End Get
Set(ByVal value As Short)
If _quantity <> value Then
' Validate the value before setting it.
If value < 1 Then
Throw New ApplicationException(String.Format( _
My.Resources.propertyNotValidNegative, _
value.ToString(), "Quantity"))
End If
ReportPropertyChanging("Quantity")
_quantity = value
ReportPropertyChanged("Quantity")
' Update the line total.
CalculateLineTotal()
End If
End Set
End Property
<EdmScalarPropertyAttribute(IsNullable:=False)> _
Public Property Product() As Integer
Get
Return _product
End Get
Set(ByVal value As Integer)
' Validate the value before setting it.
If value < 1 Then
Throw New ApplicationException(String.Format( _
My.Resources.propertyNotValidNegative, _
value.ToString(), "Product"))
End If
ReportPropertyChanging("Product")
_product = value
ReportPropertyChanged("Product")
End Set
End Property
<EdmScalarPropertyAttribute(IsNullable:=False)> _
Public Property Price() As Decimal
Get
Return _price
End Get
Set(ByVal value As Decimal)
If _price <> value Then
' Validate the value before setting it.
If value < 0 Then
Throw New ApplicationException(String.Format( _
My.Resources.propertyNotValidNegative, _
value.ToString(), "Price"))
End If
ReportPropertyChanging("Price")
_price = value
ReportPropertyChanged("Price")
' Update the line total.
CalculateLineTotal()
End If
End Set
End Property
<EdmScalarPropertyAttribute(IsNullable:=False)> _
Public Property Discount() As Decimal
Get
Return _discount
End Get
Set(ByVal value As Decimal)
' Validate the value before setting it.
If value < 0 Then
Throw New ApplicationException(String.Format( _
My.Resources.propertyNotValidNegative, _
value.ToString(), "Discount"))
End If
ReportPropertyChanging("Discount")
_discount = value
ReportPropertyChanged("Discount")
End Set
End Property
Public ReadOnly Property Total() As Decimal
Get
Return _total
End Get
End Property
Private Sub CalculateLineTotal()
_total = (_quantity * (_price - _discount))
End Sub
End Class
End Namespace
using System;
using System.Data.SqlTypes;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Data.Objects.DataClasses;
using System.Data.Metadata.Edm;
using Microsoft.Samples.Edm;
[assembly: EdmSchemaAttribute()]
[assembly: EdmRelationshipAttribute("Microsoft.Samples.Edm",
"FK_LineItem_Order_OrderId", "Order",
RelationshipMultiplicity.One, typeof(Order),"LineItem",
RelationshipMultiplicity.Many, typeof(LineItem))]
namespace Microsoft.Samples.Edm
{
[EdmEntityTypeAttribute(NamespaceName="Microsoft.Samples.Edm",Name="Order")]
public class Order : EntityObject
{
// Define private property variables.
private int _orderId;
private DateTime _orderDate;
private DateTime _dueDate;
private DateTime _shipDate;
private byte _status;
private int _customer;
private decimal _subTotal;
private decimal _tax;
private decimal _freight;
private decimal _totalDue;
private OrderInfo _ExtendedInfo;
// Public properties of the Order object.
[EdmScalarPropertyAttribute(EntityKeyProperty = true, IsNullable = false)]
public int OrderId
{
get
{
return _orderId;
}
set
{
ReportPropertyChanging("OrderId");
_orderId = value;
ReportPropertyChanged("OrderId");
}
}
// Navigation property that returns a collection of line items.
[EdmRelationshipNavigationPropertyAttribute("Microsoft.Samples.Edm","FK_LineItem_Order_OrderId", "LineItem")]
public System.Data.Objects.DataClasses.EntityCollection<LineItem> LineItem
{
get
{
return ((IEntityWithRelationships)(this)).RelationshipManager.
GetRelatedCollection<LineItem>("FK_LineItem_Order_OrderId", "LineItem");
}
}
[EdmScalarPropertyAttribute(IsNullable = false)]
public DateTime OrderDate
{
get
{
return _orderDate;
}
set
{
ReportPropertyChanging("OrderDate");
_orderDate = value;
ReportPropertyChanged("OrderDate");
}
}
[EdmScalarPropertyAttribute(IsNullable = false)]
public DateTime DueDate
{
get
{
return _dueDate;
}
set
{
ReportPropertyChanging("DueDate");
_dueDate = value;
ReportPropertyChanged("DueDate");
}
}
[EdmScalarPropertyAttribute()]
public DateTime ShipDate
{
get
{
return _shipDate;
}
set
{
ReportPropertyChanging("ShipDate");
_shipDate = value;
ReportPropertyChanged("ShipDate");
}
}
[EdmScalarPropertyAttribute(IsNullable = false)]
public byte Status
{
get
{
return _status;
}
set
{
if (_status != value)
{
ReportPropertyChanging("Status");
_status = value;
ReportPropertyChanged("Status");
}
}
}
[EdmScalarPropertyAttribute(IsNullable = false)]
public int Customer
{
get
{
return _customer;
}
set
{
ReportPropertyChanging("Customer");
_customer = value;
ReportPropertyChanged("Customer");
}
}
[EdmScalarPropertyAttribute(IsNullable = false)]
public decimal SubTotal
{
get
{
return _subTotal;
}
set
{
if (_subTotal != value)
{
// Validate the value before setting it.
if (value < 0)
{
throw new ApplicationException(string.Format(
Properties.Resources.propertyNotValidNegative,
new string[2] { value.ToString(), "SubTotal" }));
}
ReportPropertyChanging("SubTotal");
_subTotal = value;
ReportPropertyChanged("SubTotal");
// Recalculate the order total.
CalculateOrderTotal();
}
}
}
[EdmScalarPropertyAttribute(IsNullable = false)]
public decimal TaxAmt
{
get
{
return _tax;
}
set
{
// Validate the value before setting it.
if (value < 0)
{
throw new ApplicationException(string.Format(
Properties.Resources.propertyNotValidNegative,
new string[2] { value.ToString(), "Tax" }));
}
ReportPropertyChanging("TaxAmt");
_tax = value;
ReportPropertyChanged("TaxAmt");
// Recalculate the order total.
CalculateOrderTotal();
}
}
[EdmScalarPropertyAttribute(IsNullable = false)]
public decimal Freight
{
get
{
return _freight;
}
set
{
if (_freight != value)
{
// Validate the value before setting it.
if (value < 0)
{
throw new ApplicationException(string.Format(
Properties.Resources.propertyNotValidNegative,
new string[2] { value.ToString(), "Freight" }));
}
ReportPropertyChanging("Freight");
_freight = value;
ReportPropertyChanging("Freight");
// Recalculate the order total.
CalculateOrderTotal();
}
}
}
public decimal TotalDue
{
get
{
return _totalDue;
}
}
[EdmComplexPropertyAttribute()]
public OrderInfo ExtendedInfo
{
get
{
return _ExtendedInfo;
}
set
{
this.ReportPropertyChanging("ExtendedInfo");
_ExtendedInfo = value;
this.ReportPropertyChanged("ExtendedInfo");
}
}
private void CalculateOrderTotal()
{
// Update the total due as a sum of the other cost properties.
_totalDue = _subTotal + _tax + _freight;
}
}
[EdmComplexTypeAttribute(NamespaceName =
"Microsoft.Samples.Edm", Name = "OrderInfo")]
public partial class OrderInfo : ComplexObject
{
private string _orderNumber;
private string _purchaseOrder;
private string _accountNumber;
private string _comment;
[EdmScalarPropertyAttribute(IsNullable = false)]
public string OrderNumber
{
get
{
return _orderNumber;
}
set
{
// Validate the value before setting it.
if (value.Length > 25)
{
throw new ApplicationException(string.Format(
Properties.Resources.propertyNotValidString,
new string[3] { value, "OrderNumber", "25" }));
}
ReportPropertyChanging("OrderNumber");
_orderNumber = value;
ReportPropertyChanged("OrderNumber");
}
}
[EdmScalarPropertyAttribute()]
public string PurchaseOrder
{
get
{
return _purchaseOrder;
}
set
{
// Validate the value before setting it.
if ((value != null) && value.Length > 25)
{
throw new ApplicationException(string.Format(
Properties.Resources.propertyNotValidString,
new string[3] { value, "PurchaseOrder", "25" }));
}
if (_purchaseOrder != value)
{
ReportPropertyChanging("PurchaseOrder");
_purchaseOrder = value;
ReportPropertyChanged("PurchaseOrder");
}
}
}
[EdmScalarPropertyAttribute()]
public string AccountNumber
{
get
{
return _accountNumber;
}
set
{
// Validate the value before setting it.
if ((value != null) && value.Length > 15)
{
throw new ApplicationException(string.Format(
Properties.Resources.propertyNotValidString,
new string[3] { value, "AccountNumber", "15" }));
}
ReportPropertyChanging("AccountNumber");
_accountNumber = value;
ReportPropertyChanged("AccountNumber");
}
}
[EdmScalarPropertyAttribute()]
public string Comment
{
get
{
return _comment;
}
set
{
// Validate the value before setting it.
if ((value != null) && value.Length > 128)
{
throw new ApplicationException(string.Format(
Properties.Resources.propertyNotValidString,
new string[3] { value, "Comment", "128" }));
}
if (_comment != value)
{
ReportPropertyChanging("Comment");
_comment = value;
ReportPropertyChanged("Comment");
}
}
}
}
[EdmEntityTypeAttribute(NamespaceName = "Microsoft.Samples.Edm", Name = "LineItem")]
public class LineItem : EntityObject
{
// Define private property variables.
int _lineItemId;
string _trackingNumber;
short _quantity;
int _product;
decimal _price;
decimal _discount;
decimal _total;
// Default constructor.
public LineItem()
{
}
// Defines a navigation property to the Order class.
[EdmRelationshipNavigationPropertyAttribute("Microsoft.Samples.Edm", "FK_LineItem_Order_OrderId", "Order")]
public Order Order
{
get
{
return ((IEntityWithRelationships)(this)).RelationshipManager.
GetRelatedReference<Order>("FK_LineItem_Order_OrderId", "Order").Value;
}
set
{
((IEntityWithRelationships)(this)).RelationshipManager.
GetRelatedReference<Order>("FK_LineItem_Order_OrderId", "Order").Value = value;
}
}
[EdmScalarPropertyAttribute(EntityKeyProperty = true, IsNullable = false)]
public int LineItemId
{
get
{
return _lineItemId;
}
set
{
ReportPropertyChanging("LineItemId");
_lineItemId = value;
ReportPropertyChanged("LineItemId");
}
}
[EdmScalarPropertyAttribute()]
public string TrackingNumber
{
get
{
return _trackingNumber;
}
set
{
if (_trackingNumber != value)
{
// Validate the value before setting it.
if (value.Length > 25)
{
throw new ApplicationException(string.Format(
Properties.Resources.propertyNotValidString,
new string[3] {value,"TrackingNumber", "25"}));
}
ReportPropertyChanging("TrackingNumber");
_trackingNumber = value;
ReportPropertyChanged("TrackingNumber");
}
}
}
[EdmScalarPropertyAttribute(IsNullable = false)]
public short Quantity
{
get
{
return _quantity;
}
set
{
if (_quantity != value)
{
// Validate the value before setting it.
if (value < 1)
{
throw new ApplicationException(string.Format(
Properties.Resources.propertyNotValidNegative,
new string[2] { value.ToString(), "Quantity" }));
}
ReportPropertyChanging("Quantity");
_quantity = value;
ReportPropertyChanged("Quantity");
// Update the line total.
CalculateLineTotal();
}
}
}
[EdmScalarPropertyAttribute(IsNullable = false)]
public int Product
{
get
{
return _product;
}
set
{
// Validate the value before setting it.
if (value < 1)
{
throw new ApplicationException(string.Format(
Properties.Resources.propertyNotValidNegative,
new string[2] { value.ToString(), "Product" }));
}
ReportPropertyChanging("Product");
_product = value;
ReportPropertyChanged("Product");
}
}
[EdmScalarPropertyAttribute(IsNullable = false)]
public decimal Price
{
get
{
return _price;
}
set
{
if (_price != value)
{
// Validate the value before setting it.
if (value < 0)
{
throw new ApplicationException(string.Format(
Properties.Resources.propertyNotValidNegative,
new string[2] { value.ToString(), "Price" }));
}
ReportPropertyChanging("Price");
_price = value;
ReportPropertyChanged("Price");
// Update the line total.
CalculateLineTotal();
}
}
}
[EdmScalarPropertyAttribute(IsNullable = false)]
public decimal Discount
{
get
{
return _discount;
}
set
{
// Validate the value before setting it.
if (value < 0)
{
throw new ApplicationException(string.Format(
Properties.Resources.propertyNotValidNegative,
new string[2] { value.ToString(), "Discount" }));
}
ReportPropertyChanging("Discount");
_discount = value;
ReportPropertyChanged("Discount");
}
}
public decimal Total
{
get
{
return _total;
}
}
private void CalculateLineTotal()
{
_total = (_quantity * (_price - _discount));
}
}
}
Vedere anche
Attività
Procedura: personalizzare un modello EDM per l'utilizzo con oggetti personalizzati (Entity Framework)
Procedura: implementare interfacce di classi di dati personalizzate (Entity Framework)
Concetti
Personalizzazione di oggetti (Entity Framework)
Altre risorse
Utilizzo di oggetti personalizzati (attività di Entity Framework)