Procédure : hériter des classes de base EntityObject et ComplexObject (Entity Framework)
Lorsque vous utilisez des classes de données personnalisées avec un modèle EDM (Modèle de données d'entité), vous devez les mettre à jour de sorte qu'elles héritent des classes EntityObject et ComplexObject. Vous devez également appliquer des attributs EDM qui mappent les classes et les propriétés personnalisées aux types d'entité et aux types complexes définis dans le fichier CSDL (Conceptual Schema Definition Language). Pour plus d'informations, voir Procédure : mapper des objets personnalisés à des entités (Entity Framework).
Au lieu d'hériter de EntityObject ou ComplexObject, vous pouvez également implémenter des interfaces de classes de données personnalisées. Pour plus d'informations, voir Implémentation d'interfaces de classes de données personnalisées (Entity Framework).
Pour hériter d'EntityObject
Modifiez la définition de chaque classe de données personnalisée de sorte qu'elle hérite de la classe EntityObject, comme dans l'exemple suivant :
<EdmEntityTypeAttribute(NamespaceName:="Microsoft.Samples.Edm", Name:="Order")> _ Public Class Order Inherits EntityObject[EdmEntityTypeAttribute(NamespaceName="Microsoft.Samples.Edm",Name="Order")] public class Order : EntityObjectDans les propriétés scalaires définissables de chaque classe de données, ajoutez un appel à ReportPropertyChanging avant de définir la valeur de la propriété, et un appel à ReportPropertyChanged une fois la propriété définie. Cela est illustré par l'exemple suivant :
Set(ByVal value As Integer) ReportPropertyChanging("OrderId") _orderId = value ReportPropertyChanged("OrderId") End Setset { ReportPropertyChanging("OrderId"); _orderId = value; ReportPropertyChanged("OrderId"); }
Pour hériter de ComplexObject
Modifiez la définition de chaque classe de données complexe personnalisée de sorte qu'elle hérite de ComplexObject, comme dans l'exemple suivant :
<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 : ComplexObjectDans les propriétés scalaires définissables de chaque classe de données complexe, ajoutez un appel à ReportPropertyChanging avant de définir la valeur de la propriété, et un appel à ReportPropertyChanged une fois la propriété définie. Ceci est illustré dans l'exemple suivant :
' 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"); }
Exemple
Cet exemple illustre les classes de données personnalisées Order et LineItem, ainsi que la classe de données complexe OrderInfo. Ces classes personnalisées sont mappées aux tables SalesOrderHeader et SalesOrderDetail de la base de données AdventureWorks. Les classes Order et LineItem héritent de EntityObject, tandis que la classe de données complexe OrderInfo hérite de 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));
}
}
}
Voir aussi
Tâches
Procédure : personnaliser un modèle EDM (Entity Data Model) pour travailler avec des objets personnalisés (Entity Framework)
Procédure : implémenter des interfaces de classes de données personnalisées (Entity Framework)
Concepts
Personnalisation des objets (Entity Framework)
Autres ressources
Utilisation d'objets personnalisés (Tâches Entity Framework)