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POupdate listview from viewmodel
 

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  1. POupdate listview from viewmodel
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    <p>I am using MVVM and have a view which let users submit a message (like a blog) where the list "keeps populating with messages posted". When they click on save, this triggers the save command in the view model to save the message. My issue is, my gridview inside my listview doesnt update. I want to know if anyone can help me out. I'm at a point where I'm just going in circles. I know I'm missing some if not a lot of code but my brain cells are fried. </p> <p>my xaml:</p> <pre><code>&lt;Grid Name="grdMessage" HorizontalAlignment="Left" Width="816"&gt; &lt;Grid.RowDefinitions&gt; &lt;RowDefinition Height="auto"&gt;&lt;/RowDefinition&gt; &lt;RowDefinition Height="auto"&gt;&lt;/RowDefinition&gt; &lt;RowDefinition Height="auto"&gt;&lt;/RowDefinition&gt; &lt;RowDefinition Height="auto"&gt;&lt;/RowDefinition&gt; &lt;RowDefinition Height="auto"&gt;&lt;/RowDefinition&gt; &lt;RowDefinition Height="auto"&gt;&lt;/RowDefinition&gt; &lt;RowDefinition Height="auto"&gt;&lt;/RowDefinition&gt; &lt;/Grid.RowDefinitions&gt; &lt;Grid.ColumnDefinitions&gt; &lt;ColumnDefinition Width="auto"&gt;&lt;/ColumnDefinition&gt; &lt;/Grid.ColumnDefinitions&gt; &lt;TextBlock Grid.Row="0" Grid.Column="0" Text="Messages" HorizontalAlignment="Left" VerticalAlignment="Bottom" /&gt; &lt;ListView Name="lstMessage" Grid.Row="2" HorizontalAlignment="Left" VerticalAlignment="Bottom" Width="762" Height="auto" Margin="15,0,0,0" ItemsSource="{Binding Path=MessageList}"&gt; &lt;ListView.View&gt; &lt;GridView&gt; &lt;GridViewColumn Width="462" Header="Message"&gt; &lt;GridViewColumn.CellTemplate&gt; &lt;DataTemplate&gt; &lt;TextBlock Text="{Binding Path=Message, Mode=TwoWay}" TextAlignment="Left" HorizontalAlignment="Left" /&gt; &lt;/DataTemplate&gt; &lt;/GridViewColumn.CellTemplate&gt; &lt;/GridViewColumn&gt; &lt;GridViewColumn Width="150" Header="Submitter"&gt; &lt;GridViewColumn.CellTemplate&gt; &lt;DataTemplate&gt; &lt;TextBlock Text="{Binding Path=Submitter, Mode=TwoWay}" TextAlignment="Left" HorizontalAlignment="Left" /&gt; &lt;/DataTemplate&gt; &lt;/GridViewColumn.CellTemplate&gt; &lt;/GridViewColumn&gt; &lt;/GridView&gt; &lt;/ListView.View&gt; &lt;/ListView&gt; &lt;TextBox Name="txtNewMessage" Grid.Row="4" Grid.Column="0" HorizontalAlignment="Left" VerticalAlignment="Top" Width="762" Height="auto" TextWrapping="Wrap" AcceptsReturn="True" HorizontalScrollBarVisibility="Auto" Visibility="Collapsed" Text="{Binding Path=Message, Mode=TwoWay}"/&gt; &lt;Button Name="btnAddMessage" Grid.Row="6" Grid.Column="0" Content="Add" HorizontalAlignment="Right" VerticalAlignment="Bottom" Margin="0,0,0,0" Command="{Binding Path=Save}" /&gt; </code></pre> <p></p> <p>my viewmodel:</p> <pre><code>Message message; </code></pre> <p><code>ObservableCollection&lt;Message&gt; messageList;</code><br> <code>RelayCommand save;</code></p> <pre><code> public ObservableCollection&lt;Message&gt; MessageList { get { if (messageList == null) messageList = new ObservableCollection&lt;Message&gt;(); } } public ICommand Save { get { return saveCmd ?? (save = new RelayCommand(parameter =&gt; SaveMessage())); } } void SaveMessage() { </code></pre> <p>this.MessageList.Add(this.Message); dataSource.AddMessage(message);</p> <pre><code> } Message Model string message; [DataMember] public int Submitter {get; set;} [DataMember] public string Message { get{ return(message);} set { if (message != value) { message = value; OnPropertyChanged("Message"); } } } </code></pre>
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    1. USCalvin
    1. USCalvin
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    1. COIs it somewhere in code something like messageList.add(myNewMessage); ?
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      1. USKlaus78
    2. COYou are adding to the database, but do you update the messageList as well?
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      1. USDabblernl
 

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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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