[WPF] Update du SelectedItem d'un ListView avec Converter

1 pièce(s) jointe(s)

Bonjour,

Dans l'exemple suivant, un ListView, 1 TextBox liés à la valeur 'Name' de l'élément sélectionnée, 1 autre TextBox lié à la valeur 'Picture'...et un bouton.
Le bouton, une fois pressé efface la valeur 'Picture' de l'élément sélectionné.

Pièce jointe 185251

Je remarque bien que pour le 'Name', une édition dans le champ texte du nom est impactée immédiatement dans le ListView
Pourquoi, svp, quand le bouton d'effacement est pressé, ce n'est pas impacté directement ET dans le ListView ET dans le champ texte correspondant!?

Comment dois-je m'y prendre?

Merci d'avance pour l'aide que vous voudrez bien m'accorder!!

Code:

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<Window x:Class="MainWindow"
    xmlns:local="clr-namespace:WpfApplication1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MainWindow" Height="350" Width="525">
 
    <Grid>
        <Grid.Resources>
            <local:checkImageURL x:Key="checkImage"/>
        </Grid.Resources>
        <ListView Height="230" HorizontalAlignment="Left" Margin="12,12,0,0" Name="PersonListView" VerticalAlignment="Top" Width="445">
            <ListView.View>
                <GridView >
                    <GridViewColumn DisplayMemberBinding="{Binding Id}" Width="80">
                        <GridViewColumnHeader>Id</GridViewColumnHeader>
                    </GridViewColumn>
                    <GridViewColumn DisplayMemberBinding="{Binding Name}" Width="100">
                        <GridViewColumnHeader>Name</GridViewColumnHeader>
                    </GridViewColumn>
                    <GridViewColumn Width="100">
                        <GridViewColumnHeader>Picture</GridViewColumnHeader>
                        <GridViewColumn.CellTemplate>
                            <DataTemplate>
                                <TextBox Text="{Binding Path=Picture, Converter={StaticResource checkImage}}" />
                            </DataTemplate>
                        </GridViewColumn.CellTemplate>
                    </GridViewColumn>
                </GridView>
            </ListView.View>
        </ListView>
        <TextBox DataContext="{Binding SelectedItem, ElementName=PersonListView}" Text="{Binding Path=Name, UpdateSourceTrigger =PropertyChanged}" Height="23" HorizontalAlignment="Left" Margin="12,261,0,0" Name="TextBlock1" VerticalAlignment="Top" Width="121" />
        <TextBox DataContext="{Binding SelectedItem, ElementName=PersonListView}" Text="{Binding Path=Picture, UpdateSourceTrigger=PropertyChanged}" Height="23" HorizontalAlignment="Left" Margin="218,258,0,0" Name="TextBox1"  VerticalAlignment="Top" Width="121" />
        <Button Content="Effacer image" Height="23" HorizontalAlignment="Right" Margin="0,258,46,0" Name="Button1" VerticalAlignment="Top" Width="112" />
    </Grid>
</Window>

Code:

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Imports System.Collections.ObjectModel
Imports System.ComponentModel
 
Class MainWindow
    Private Sub MainWindow_Loaded(sender As Object, e As System.Windows.RoutedEventArgs) Handles Me.Loaded
        Dim personList As New List(Of Person)()
        personList.Add(New Person() With {.Id = 1, .Name = "Alain", .Picture = "Photo d'Alain"})
        personList.Add(New Person() With {.Id = 2, .Name = "Pierre", .Picture = "Photo de Pierre"})
        personList.Add(New Person() With {.Id = 3, .Name = "Marc", .Picture = "Photo de Marc"})
        PersonListView.ItemsSource = personList
    End Sub
 
    Private Sub Button1_Click(sender As System.Object, e As System.Windows.RoutedEventArgs) Handles Button1.Click
        Dim p As Person = TryCast(PersonListView.SelectedItem, Person)
        p.Picture = ""
    End Sub
End Class
Public Class checkImageURL
    Implements IValueConverter
    Public Function Convert(ByVal value As Object, ByVal targetType As Type, ByVal parameter As Object, ByVal culture As System.Globalization.CultureInfo) As Object Implements IValueConverter.Convert
        If value = "" Then
            Return "☺"
        Else
            Return "☻"
        End If
        Return Nothing
    End Function
    Public Function ConvertBack(ByVal value As Object, ByVal targetType As Type, ByVal parameter As Object, ByVal culture As System.Globalization.CultureInfo) As Object Implements IValueConverter.ConvertBack
        Return Nothing
    End Function
End Class
Public Class Person
    Public Property Id() As Int32
        Get
            Return m_Id
        End Get
        Set(value As Int32)
            m_Id = Value
        End Set
    End Property
    Private m_Id As Int32
    Public Property Name() As String
        Get
            Return m_Name
        End Get
        Set(value As String)
            m_Name = Value
        End Set
    End Property
    Private m_Name As String
    Public Property Picture() As String
        Get
            Return m_Picture
        End Get
        Set(value As String)
            m_Picture = value
        End Set
    End Property
    Private m_Picture As String
End Class

bonjour
Ton class Person souffre d'un defaut ...Il n'implement pas l'interface INotifyPropertyChanged qui est dans les canons du MVVM....cet interface est charge de notifier le changement da valeur de propriete du model (person vers les controls)....et tu as modifie la prop du model et non une prop de control(les controls communiquent entre sans passer par le model
Code .vb

Code:

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Public Class Person
    Implements INotifyPropertyChanged
 
    Public Property Id() As Int32
        Get
            Return m_Id
        End Get
        Set(ByVal value As Int32)
            m_Id = value
            RaisePropertyChanged("Id")
        End Set
    End Property
    ' idem pour les autres props ....
 
    Public Event PropertyChanged(ByVal sender As Object, ByVal e As System.ComponentModel.PropertyChangedEventArgs) Implements System.ComponentModel.INotifyPropertyChanged.PropertyChanged
 
    Private Sub RaisePropertyChanged(ByVal propName As String)
        RaiseEvent PropertyChanged(Me, New PropertyChangedEventArgs(propName))
    End Sub
 
End Class

bon code...

Un tout grand merci MABROUKI, j'ai pigé et cela marche tout de suite mieux!! Merci!!