Refresh data binding issues between Listview and ComboBox
I am struggling with a binding issue in WPF / Silverlight. I have a Listview witch filled with a DataContext form with a linq EF request. In the same usercontrol there are text fields. When their values change, the listview gets a refresht and the data changes in debbj.SaveChanges. The problem is, if I use the combobox, the data persists, but the list is not updated.
You can help? Here is the xaml
<ListView Grid.Row="1" Grid.Column="0" Margin="4,4,4,0" x:Name="controlsListBox" Grid.RowSpan="7" ItemsSource="{Binding}" SelectedValuePath="ID" LostFocus="controlsListBox_LostFocus">
<ListView.View>
<GridView>
<GridViewColumn Width="25" Header="Rw" DisplayMemberBinding="{Binding RowNr}"/>
<GridViewColumn Width="25" Header="Cl" DisplayMemberBinding="{Binding ColumnNr}"/>
<GridViewColumn Width="100" Header="Name" DisplayMemberBinding="{Binding Name}"/>
<GridViewColumn Width="25" Header="Tb" DisplayMemberBinding="{Binding TabIndex}"/>
<GridViewColumn Width="100" Header="Type" DisplayMemberBinding="{Binding ControlTypes.Name}"/>
<GridViewColumn Width="100" Header="Text" DisplayMemberBinding="{Binding TextResources.Text}"/>
</GridView>
</ListView.View>
</ListView>
<Label Grid.Row="2" Grid.Column="5" Height="23" Margin="4,4,4,0" x:Name="rowSpanLabel" VerticalAlignment="Top"
Content="RowNr"/>
<TextBox Grid.Row="2" Grid.Column="6" Height="23" Margin="4,4,4,0" x:Name="rowSpanTextBox" VerticalAlignment="Top"
Text="{Binding Path=SelectedItem.RowNr, ElementName=controlsListBox}"/>
<Label Grid.Row="4" Grid.Column="1" Grid.ColumnSpan="2" Height="23" Margin="4,4,4,0" x:Name="controlTypeLabel" VerticalAlignment="Top"
Content="Type"/>
<ComboBox Grid.Row="4" Grid.Column="2" Grid.ColumnSpan="5" Height="23" Margin="4,4,4,0" x:Name="controlTypeComboBox" VerticalAlignment="Top"
DataContext="{Binding Path=ControlTypes, ElementName=controlsListBox}" IsSynchronizedWithCurrentItem="True" DisplayMemberPath="Name"
SelectedItem="{Binding Path=SelectedItem.ControlTypes, ElementName=controlsListBox, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
/>
And here is the C # code: _controlProperties.Clear (); var data = (from x to _dataContext.ControlProperties where x.FormProperties.ID == 1 orderby x.RowNr, x.ColumnNr, x.Name select x); foreach (var item in data) {item.TextResourcesReference.Load (); _controlProperties.Add (item); } // DataContext must be null for a valid result. controlsListBox.DataContext = null; controlsListBox.DataContext = _controlProperties;
controlTypeComboBox.DataContext = (from c in _dataContext.ControlTypes
orderby c.Name
select c).ToList();
You are setting the DataContext for the ComboBox, but not the ItemsSource. In your code, you rewrite the DataContext to provide a list of control types, so the XAML portion is ignored anyway.
Remove the DataContext declaration and use this instead:
ItemsSource="{Binding}"
This should cause the control types to appear in the combo box. When I do this, the selected control type is displayed as a list.
You can also have a look at Update Controls.NET , my open source alternative for WPF data binding. It takes some of the bookkeeping from related classes.
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