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| Imports System.Reflection
Imports System.ComponentModel
#Region "Custom Atributs"
<AttributeUsage(AttributeTargets.All)>
Public Class DataInfoAttribute
Inherits System.Attribute
' Toutes les classes d'attribut héritent de System.Attribute
Sub New(ByVal FieldName As String)
Me.FieldName = FieldName
End Sub
Private _FielName As String
Public Property FieldName() As String
Get
Return _FielName
End Get
Set(ByVal value As String)
_FielName = value
End Set
End Property
Private _dataType As Type
Public Property DataType() As Type
Get
Return _dataType
End Get
Set(ByVal value As Type)
_dataType = value
End Set
End Property
Private _FielLenght As Integer
Public Property FiedLenght() As Integer
Get
Return _FielLenght
End Get
Set(ByVal value As Integer)
_FielLenght = value
End Set
End Property
End Class
#End Region
#Region "DataEventArgs"
Public Class DataEventArgs
Public Sub New(ByVal PropertyName As String, ByVal OriginalValue As Object, ByVal ProposedValue As Object)
Me.PropertyName = PropertyName
Me.OriginalValue = OriginalValue
Me.ProposedValue = ProposedValue
End Sub
Private _PropertyName As String
Public Property PropertyName() As String
Get
Return _PropertyName
End Get
Set(ByVal value As String)
_PropertyName = value
End Set
End Property
Private _OriginaleValue As Object
Public Property OriginalValue() As Object
Get
Return _OriginaleValue
End Get
Set(ByVal value As Object)
_OriginaleValue = value
End Set
End Property
Private _Proposedvalue As Object
Public Property ProposedValue() As Object
Get
Return _Proposedvalue
End Get
Set(ByVal value As Object)
_Proposedvalue = value
End Set
End Property
End Class
Public Class DataEventArgspropertyChanging
Inherits DataEventArgs
Public Sub New(ByVal PropertyName As String, ByVal OriginalValue As Object, ByVal ProposedValue As Object)
MyBase.New(PropertyName, OriginalValue, ProposedValue)
Me.Cancel = False
Me.ErrorMessage = String.Empty
End Sub
Private _Cancel As Boolean
Public Property Cancel() As Boolean
Get
Return _Cancel
End Get
Set(ByVal value As Boolean)
_Cancel = value
End Set
End Property
Private _ErrorMessage As String
Public Property ErrorMessage() As String
Get
Return _ErrorMessage
End Get
Set(ByVal value As String)
_ErrorMessage = value
End Set
End Property
End Class
#End Region
Public MustInherit Class DTOBase
Implements INotifyPropertyChanged
Public Event PropertyChanged As PropertyChangedEventHandler _
Implements INotifyPropertyChanged.PropertyChanged
Event DataPropertyChanging(ByVal Sender As Object, ByVal e As DataEventArgspropertyChanging)
Event DataPropertyChanged(ByVal Sender As Object, ByVal e As DataEventArgs)
Dim DataEventArgsPropertyChanging As DataEventArgspropertyChanging
'Dim _ErrorMessage As String
Dim LockPropertyChanging As Boolean
Protected Function NotifyPropertyChanging(ByVal PropertyName As String, ByVal OriginalValue As Object, ByVal ProposedValue As Object) As Boolean
If _IsInizializingComponent = True Or LockPropertyChanging = True Or LockPropertyChanged = True Then
'If _IsInizializingComponent = True Or LockPropertyChanging = True Then
Return Nothing
Exit Function
End If
RaiseEvent PropertyChanged(Me, New PropertyChangedEventArgs(PropertyName))
LockPropertyChanging = True
DataEventArgsPropertyChanging = New DataEventArgspropertyChanging(PropertyName, OriginalValue, ProposedValue)
RaiseEvent DataPropertyChanging(Me, DataEventArgsPropertyChanging)
LockPropertyChanging = False
If DataEventArgsPropertyChanging.Cancel = True Then
' Modification Annulée
'_ErrorMessage = DataEventArg.ErrorMessage
'DataEventArg = Nothing
Return True
'Return OriginalValue
Else
' Modification acceptée
'_ErrorMessage = ""
' DataEventArg = Nothing
'Dim ColName As String = GetAttributsByProp(PropertyName)
'Save(ColName, ProposedValue)
Return False
'Return ProposedValue
End If
End Function
Dim LockPropertyChanged As Boolean
Protected Sub NotifyPropertyChanged(ByVal PropertyName As String, ByVal Value As Object)
If _IsInizializingComponent = True Or LockPropertyChanging = True Or LockPropertyChanged = True Then Exit Sub
'If _IsInizializingComponent = True Or LockPropertyChanging = True Then Exit Sub
LockPropertyChanged = True
Dim DataEventArg = New DataEventArgs(PropertyName, Value, Value)
RaiseEvent DataPropertyChanged(Me, DataEventArg)
LockPropertyChanging = False
LockPropertyChanged = False
End Sub
Protected _IsInizializingComponent As Boolean
Private _DicoAttributes As New Dictionary(Of String, DataInfoAttribute)
Private _DicoProperties As New Dictionary(Of String, PropertyInfo)
Private _DicoAttToProperties As New Dictionary(Of String, String)
Private _DicoPropToAttributs As New Dictionary(Of String, String)
Public Sub New()
Call LoadListesAttributesAndProperties()
_IsNew = True
End Sub
Public Sub New(ByVal RowView As DataRowView)
Me.New()
Me.RowViewSource = RowView
Call SetProperties(RowView)
_IsNew = False
End Sub
Private _IsNew As Boolean
Public ReadOnly Property IsNew() As Boolean
Get
Return _IsNew
End Get
'Set(ByVal value As Boolean)
' _IsNew = value
'End Set
End Property
Private _RowViewSource As DataRowView
Public Property RowViewSource() As DataRowView
Get
Return _RowViewSource
End Get
Set(ByVal value As DataRowView)
_RowViewSource = value
_IsNew = False
End Set
End Property
Public ReadOnly Property Attributs() As Dictionary(Of String, DataInfoAttribute)
Get
Return _DicoAttributes
End Get
'Set(ByVal value As Dictionary(Of String, DataInfoAttribute))
' _DicoPropToAttributs = value
'End Set
End Property
'Private _DicoPropToAttributs As Dictionary(Of String, DataInfoAttribute)
Public ReadOnly Property Properties() As Dictionary(Of String, PropertyInfo)
Get
Return _DicoProperties
End Get
'Set(ByVal value As Dictionary(Of String, DataInfoAttribute))
' _DicoPropToAttributs = value
'End Set
End Property
Public Function GetAttributsByProp(ByVal PropertyName As String) As String
If Not _DicoPropToAttributs.ContainsKey(PropertyName) Then
Throw New Exception(String.Format("Le dictionnaire des Attributs ne contient pas la propriété '{0}' du DTO '{1}'", PropertyName, Me.ToString))
Exit Function
End If
'Dim KeyAtt As String = _DicoPropToAttributs(PropertyName)
'Return _DicoAttributes(KeyAtt)
Return _DicoPropToAttributs(PropertyName)
End Function
Public Sub Save()
If Me.IsNew = True Or Me.RowViewSource Is Nothing Then
Throw New Exception(String.Format("le DTO '{0}' est détaché ou la propriété 'RowSource' n'a pas été assignée", Me.ToString))
Exit Sub
End If
SaveProperties(Me.RowViewSource)
End Sub
Public Sub Save(ByVal ColChangingName As String, Optional ByVal SetRequestToDBNull As Boolean = False)
If Me.IsNew = True Or Me.RowViewSource Is Nothing Then
Throw New Exception(String.Format("le DTO '{0}' est détaché ou la propriété 'RowSource' n'a pas été assignée", Me.ToString))
Exit Sub
End If
Dim propriété As PropertyInfo
If Not _DicoAttToProperties.ContainsKey(ColChangingName) Then
Throw New Exception(String.Format("Le dictionnaire des propriétés ne contient pas la clé du champ '{0}' de l'objet métier '{1}'", ColChangingName, Me.ToString))
Exit Sub
Else
Dim Keyprop As String = _DicoAttToProperties(ColChangingName)
propriété = _DicoProperties(Keyprop)
Dim value As Object = propriété.GetValue(Me, Nothing)
SaveProperty(Me.RowViewSource, ColChangingName, value, SetRequestToDBNull)
End If
End Sub
Private Sub Save(ByVal ColChangingName As String, ByVal Value As Object, Optional ByVal SetRequestToDBNull As Boolean = False)
If Me.IsNew = True Or Me.RowViewSource Is Nothing Then
Throw New Exception(String.Format("le DTO '{0}' est détaché ou la propriété 'RowSource' n'a pas été assignée", Me.ToString))
Exit Sub
End If
SaveProperty(Me.RowViewSource, ColChangingName, Value, SetRequestToDBNull)
End Sub
Private Sub LoadListesAttributesAndProperties()
Dim attributs() As Object
Dim att As DataInfoAttribute
'Dim methode As System.Reflection.MethodInfo
Dim propriété As System.Reflection.PropertyInfo
Dim attType As Type = GetType(DataInfoAttribute)
'Dim classType As Type = GetType(DTOTache)
Dim classType As Type = Me.GetType
'Debug.WriteLine("Ordinal = " & Col.Ordinal.ToString & " - ColumnName = " & Col.ColumnName.ToString & " - Type = " & Col.DataType.ToString & " - Value = " & Value.ToString)
For Each propriété In classType.GetProperties
Dim keyProp As String = propriété.Name
attributs = Attribute.GetCustomAttributes(propriété, attType)
If attributs.Length > 0 Then
att = DirectCast(attributs(0), DataInfoAttribute)
Dim keyAtt As String = att.FieldName
If Not _DicoAttributes.ContainsKey(keyAtt) Then
_DicoAttributes.Add(keyAtt, att)
_DicoAttToProperties.Add(keyAtt, keyProp)
_DicoPropToAttributs.Add(keyProp, keyAtt)
Else
Throw New Exception(String.Format("L'attribut '{0}' existe déja dans le DTO '{1}'", keyAtt, Me.ToString))
Exit Sub
End If
'Debug.WriteLine("Propriété = " & propriété.Name)
'Debug.WriteLine("Field Name = " & att.FieldName)
'Debug.WriteLine("Field Lenght = " & att.FiedLenght)
End If
If Not _DicoProperties.ContainsKey(keyProp) Then
_DicoProperties.Add(keyProp, propriété)
End If
Next
End Sub
Private Sub SetProperties(ByVal RowView As DataRowView)
_IsInizializingComponent = True
Dim Row As DataRow = RowView.Row
For Each Col As DataColumn In Row.Table.Columns
Dim Value As Object = GetTrueValue(Row, Col)
'Debug.WriteLine("Ordinal = " & Col.Ordinal.ToString & " - ColumnName = " & Col.ColumnName.ToString & " - Type = " & Col.DataType.ToString & " - Value = " & Value.ToString)
Dim ColName As String = Col.ColumnName
If _DicoAttToProperties.ContainsKey(ColName) Then
'Dim att As DataInfoAttribute = _DicoAttributes(KeyAtt)
'att.FiedLenght = Col.MaxLength
_DicoAttributes(ColName).FiedLenght = Col.MaxLength
_DicoAttributes(ColName).DataType = Col.DataType
Dim Keyprop As String = _DicoAttToProperties(ColName)
If _DicoProperties.ContainsKey(Keyprop) Then
Dim prop As PropertyInfo = _DicoProperties(Keyprop)
prop.SetValue(Me, Value, Nothing)
Else
Throw New Exception(String.Format("Le champ '{0}' du DataRow n'a pas pu initialiser la propriété correspondante du DTO '{1}'", Col.ColumnName, Me.ToString))
Exit Sub
End If
Else
Throw New Exception(String.Format("Le champ '{0}' du DataRow n'a pas pu initialiser l'attribut correspondant du DTO '{1}'", Col.ColumnName, Me.ToString))
Exit Sub
End If
Next
_IsInizializingComponent = False
End Sub
'Private IsSettingProperty As Boolean
Public Function SetProperty(ByVal ColName As String, ByVal Value As Object) As DataEventArgspropertyChanging
'IsSettingProperty = True
Dim Keyprop As String = _DicoAttToProperties(ColName)
If _DicoProperties.ContainsKey(Keyprop) Then
Dim prop As PropertyInfo = _DicoProperties(Keyprop)
prop.SetValue(Me, Value, Nothing)
Else
Throw New Exception(String.Format("Le champ '{0}' du DataRow n'a pas pu initialiser la propriété correspondante du DTO '{1}'", ColName, Me.ToString))
Exit Function
End If
'IsSettingProperty = False
Return DataEventArgsPropertyChanging
End Function
'Private Function GetPropertieInfoByDataInfoAttributName(ByVal DataInfoAttribut As DataInfoAttribute) As PropertyInfo
' Return GetPropertieInfoByDataInfoAttributName
'End Function
'Private Function GetDataAttributsByPropertyName(ByVal PropertyInfo As PropertyInfo) As DataInfoAttribute
'End Function
Private Sub SaveProperties(ByVal RowView As DataRowView)
Dim Row As DataRow = RowView.Row
Dim attributs() As Object
Dim att As DataInfoAttribute
'Dim methode As System.Reflection.MethodInfo
Dim propriété As PropertyInfo
Dim attType As Type = GetType(DataInfoAttribute)
'Dim classType As Type = GetType(DTOTache)
Dim classType As Type = Me.GetType
For Each propriété In classType.GetProperties
Dim MatchField As Boolean = False
Dim Value As Object = propriété.GetValue(Me, Nothing)
attributs = Attribute.GetCustomAttributes(propriété, attType)
If attributs.Length > 0 Then
att = DirectCast(attributs(0), DataInfoAttribute)
For Each Col As DataColumn In Row.Table.Columns
If Col.ColumnName = att.FieldName Then
MatchField = True
'propriété.SetValue(Me, Value, Nothing)
WriteValue(Row, Col.ColumnName, Value)
'row(Col) = Value
'Debug.WriteLine("Propriété = " & propriété.Name)
'Debug.WriteLine("Field Name = " & att.FieldName)
'Debug.WriteLine("Field Lenght = " & att.FiedLenght)
End If
Next
If MatchField = False Then
Throw New Exception(String.Format("Une Propriété '{0}' du DTO '{1}' n'a pas trouvé le champ du DataRow correspondant", propriété.Name, Me.ToString))
Exit Sub
End If
End If
Next
End Sub
Private Sub SaveProperty(ByVal RowView As DataRowView, ByVal ColChangingName As String, ByVal Value As Object, Optional ByVal SetRequestToDBNull As Boolean = False)
Dim Row As DataRow = RowView.Row
'Dim propriété As PropertyInfo
'If Not _DicoAttToProperties.ContainsKey(ColChangingName) Then
' Throw New Exception(String.Format("Le dictionnaire des propriétés ne contient pas la clé du champ '{0}' de l'objet métier '{1}'", ColChangingName, Me.ToString))
' Exit Sub
'Else
'Dim Keyprop As String = _DicoAttToProperties(ColChangingName)
'propriété = _DicoProperties(Keyprop)
'Dim value As Object = propriété.GetValue(Me, Nothing)
If SetRequestToDBNull = True Then
Call WriteDBNull(Row, ColChangingName)
Else
Call WriteValue(Row, ColChangingName, Value)
End If
'row(ColChangingName) = value
'End If
End Sub
Private Function GetTrueValue(ByVal row As DataRow, ByVal Col As DataColumn) As Object
Dim _Type As Type = Col.DataType
Dim _TypeCode As TypeCode = Type.GetTypeCode(_Type)
Dim value As Object = row(Col)
If value Is DBNull.Value Then
value = Nothing
Else
'Value = CType(Value, T)
End If
If _TypeCode = TypeCode.String Then 'Le type String est un Type réference qui peut prendre la valeur Nothing. Il faut convertir la valeur Nothing en "".
If value Is Nothing Then value = ""
Else
' T_Defaut = Defaut
End If
Return value
End Function
Public Sub WriteDBNull(ByVal Row As DataRow, ByVal ColName As String)
TryToWriteValue(Row, ColName, DBNull.Value)
End Sub
Public Sub WriteValue(ByVal Row As DataRow, ByVal ColName As String, ByVal Value As Object)
If Value Is Nothing Then Value = DBNull.Value
Dim Original As Object = Row(ColName)
If Original Is Nothing Then
TryToWriteValue(Row, ColName, Value)
Else
If Original.Equals(Value) Then
Else
TryToWriteValue(Row, ColName, Value)
End If
End If
End Sub
Private Sub TryToWriteValue(ByVal Row As DataRow, ByVal ColName As String, ByVal Value As Object)
Try
Row(ColName) = Value
Mysource1.TraceEvent(TraceEventType.Verbose, 0, String.Format("### Ecriture ### ColName = '{0}' - Value = '{1}'", ColName, Value.ToString))
Catch ex As Exception
MessageBox.Show(ex.Message, "Echec d'écriture", MessageBoxButtons.OK, MessageBoxIcon.Error)
End Try
End Sub
End Class |
De l'utilisation des DTO
Répondre avec citation
Envoyé par Kropernic
Pensez à utiliser les boutons 
, 
et les 
(une couche supplémentaire de service peut venir s’intercaler entre GUI et BLL)
et je vous remercie vraiment beaucoup pour m'avoir éclairé sur le développement en couche et les DTO.
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