uwp Listview is not updated

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  Hi

  It's an uwp blank application  i use a listwiew  to display a list of data

  The list is display but one time ,if i update the list ,changes are not displayed

  Public Class Classdata
      Public Property thename() As String
          Get
              Return name
          End Get
          Set(ByVal value As String)
              value = name
          End Set
      End Property
      Public Property thedate() As String
          Get
              Return hdate
          End Get
          Set(ByVal value As String)
              value = hdate
          End Set
      End Property
      Public Property civildate() As String
          Get
              Return civild
          End Get
          Set(ByVal value As String)
              value = civild
          End Set
      End Property
  
      Public name As String
      Public hdate As String
      Public civild As String
  End Class
  
   The Blank Page item template is documented at https://go.microsoft.com/fwlink/?LinkId=402352&clcid=0x409
  
  Imports System.Text
  ''' <summary>
  ''' An empty page that can be used on its own or navigated to within a Frame.
  ''' </summary>
  Public NotInheritable Class MainPage
      Inherits Page
  #Region "initialize"
    Private list1 As New List(Of Classdata)
    Private Sub initlist()
      Dim data As Classdata
          list1.Clear()
          For iter = 1 To 10
              data = New Classdata
              data.name = "AAAA" & iter.ToString
              data.hdate = Date.Now.ToLongDateString
              data.civild = Date.Today.ToShortDateString
              list1.Add(data)
          Next
      End Sub
      Private Sub showlist()
          Dim myBind As Binding = New Binding()
  
          myBind.Source = list1
          myBind.Mode = BindingMode.OneWay
          Dgvresult.SetBinding(ListView.ItemsSourceProperty, myBind)
      End Sub
  
   Private Sub MainPage_Loading(sender As FrameworkElement, args As Object) Handles Me.Loading
        
       initlist()
       showlist()
      End Sub
  
  Private Sub Buttonthisyear_Click(sender As Object, e As RoutedEventArgs) Handles Buttonthisyear.Click
          list1(1).name = "THENAMECHANGE"
          showlist()
      End Sub
  
  #End Region
  
  
  End Class

  
  

  The xaml

  <ListView x:Name="Dgvresult" 
          Width="800" Height="600" 
          ScrollViewer.VerticalScrollBarVisibility="Visible" BorderThickness="3,1,3,3" 
           HorizontalAlignment="Left" VerticalAlignment="Top" Margin="60,20,0,0">
           <ListView.ItemTemplate>
               <DataTemplate>
                <StackPanel x:Name="stackp" 
                         
                 Orientation="Vertical" Width="650" HorizontalAlignment="Left" Margin="69,0,0,0" 
                 CornerRadius="6,6,6,6" BorderThickness="2,2,2,2" Height="Auto" 
                          >
                 <TextBlock x:Name="namep" Text="{Binding thename}" 
                   FontSize="20" 
                   FontFamily="Calibri"
                   FontStyle="Normal" 
                   FontWeight="Bold"
                   Foreground="DarkSlateBlue" HorizontalAlignment="Left" Margin="492,0,0,0" 
                   VerticalAlignment="Center" TextAlignment="Center" 
                   HorizontalTextAlignment="Left" Padding="0,0,0,0" TextWrapping="Wrap"    />
  
                   <TextBlock x:Name="thedate" Text="{Binding thedate}" 
                      Margin="270,-26,0,0"
                      FontSize="20" 
                      FontStyle="Normal"  
                      Foreground="DarkSlateBlue"       
                     FontWeight="Bold" FontFamily="Calibri" 
                     HorizontalAlignment="Left" VerticalAlignment="Center"
                     Padding="0,2,0,0" TextWrapping="Wrap"  />
                     <TextBlock x:Name="civildate" Text="{Binding civildate}" 
                        Margin="90,-26,0,0"
                         FontSize="20" 
                         FontStyle="Normal" 
                         FontWeight="Bold"
                         Foreground="DarkSlateBlue" FontFamily="Calibri" HorizontalAlignment="Left" VerticalAlignment="Center" 
                         Padding="0,0,0,0" TextWrapping="Wrap" />
                          </StackPanel>
                      </DataTemplate>
                  </ListView.ItemTemplate>
              </ListView>
  
         

  
  

  When i launch the app  list1 is well displayed but  when i click "buttonthisyear  no change appears
  

  Thanks

  
  
  

  • Edited by Shay_w Wednesday, March 4, 2020 5:22 PM
  • Moved by Julie Xu-MSFTMicrosoft contingent staff Thursday, March 12, 2020 9:07 AM UWP

  Wednesday, March 4, 2020 5:14 PM