So here is the setup. I have two different WPF views. StandardEngineeredView and StandardEngineeredPrintView. I have an ObservableCollection called ModelRevisionList in my StandardEngineeredViewModel.
What I am doing is trying to bind to the ModelRevisionList data source from two different views. I have the data context of my views set to the same view model. There is a button in my StandardEngineeredView that navigates me to the StandardEngineeredPrintView. This second view will essentially just be used to allow someone to print data. Note I have several other properties I will be binding to in the view model from both views. I just have not attempted to do so yet because when trying to bind to the revision List I get the following error:
System.Windows.Markup.XamlParseException HResult=0x80131501 Message='Add value to collection of type 'System.Windows.Controls.ItemCollection' threw an exception.' Line number '204' and line position '55'. Source=PresentationFramework StackTrace: at System.Windows.Markup.WpfXamlLoader.Load(XamlReader xamlReader, IXamlObjectWriterFactory writerFactory, Boolean skipJournaledProperties, Object rootObject, XamlObjectWriterSettings settings, Uri baseUri) at System.Windows.Markup.WpfXamlLoader.LoadBaml(XamlReader xamlReader, Boolean skipJournaledProperties, Object rootObject, XamlAccessLevel accessLevel, Uri baseUri) at System.Windows.Markup.XamlReader.LoadBaml(Stream stream, ParserContext parserContext, Object parent, Boolean closeStream) at System.Windows.Application.LoadComponent(Object component, Uri resourceLocator) at LabelPrinting.Views.EngineeringViews.StandardEngineeredPrintView.InitializeComponent() in C:\Users\eric_obermuller\source\repos\LabelPrinting\LabelPrinting\Views\EngineeringViews\StandardEngineeredPrintView.xaml:line 1
Inner Exception 1: InvalidOperationException: Operation is not valid while ItemsSource is in use. Access and modify elements with ItemsControl.ItemsSource instead.
Relevant Information
StandardEngineeredViewModel Revision List
private ObservableCollection<Revision> _ModelRevisionList = new ObservableCollection<Revision>();
public ObservableCollection<Revision> ModelRevisionList
{
get { return _ModelRevisionList; } //Error thrown here upon get
set { Set(ref _ModelRevisionList, value); }
}
StandarEngineeredView List Box that is bound
<ListBox
BorderBrush="{StaticResource BackgroundBlueBrush}"
ItemsSource="{Binding ModelRevisionList}"
SelectedItem="{Binding SelectedRevision}"
DisplayMemberPath="Date"
Margin="70 10"
MinHeight="150"
MaxHeight="150"
ItemStringFormat="{}{0:MM/dd/yyyy}"/>
StandardEngineeredPrintView gridview that is bound
<Border Grid.Column="1" MaxHeight="250" MaxWidth="400" MinWidth="400">
<DataGrid ItemsSource="{Binding ModelRevisionList}" AutoGenerateColumns="False">
<DataGridTextColumn Header="Date" Binding="{Binding Date}"/>
<DataGridTextColumn Header="Edited By" Binding="{Binding EditedBy}"/>
<DataGridTextColumn Header="Description" Binding="{Binding Description}"/>
</DataGrid>
</Border>
Data Context that is set in both views
DataContext="{Binding StandardEngineeredViewInstance, Source={StaticResource Locator}}"
View Model Locator
public class ViewModelLocator
{
/// <summary>
/// Initializes a new instance of the ViewModelLocator class.
/// </summary>
public ViewModelLocator()
{
ServiceLocator.SetLocatorProvider(() => SimpleIoc.Default);
SetupNavigation();
if (ViewModelBase.IsInDesignModeStatic)
{
// Create design time view services and models
SimpleIoc.Default.Register<IDataAccessService, DataAccessService>();
}
else
{
// Create run time view services and models
SimpleIoc.Default.Register<IDataAccessService, DataAccessService>();
}
}
public StandardEngineeredViewModel StandardEngineeredViewInstance
{
get
{
SimpleIoc.Default.Register<StandardEngineeredViewModel>();
return ServiceLocator.Current.GetInstance<StandardEngineeredViewModel>();
}
}
public static void Cleanup()
{
// TODO Clear the ViewModels
}
private static void SetupNavigation()
{
SimpleIoc.Default.Unregister<IFrameNavigationService>();
var navigationService = new FrameNavigationService();
navigationService.Configure("StandardEngineeredPrintView", new Uri("/Views/EngineeringViews/StandardEngineeredPrintView.xaml", UriKind.Relative));
SimpleIoc.Default.Register<IFrameNavigationService>(() => navigationService);
}
}
Now due to the error, I am thinking it has something to do with the fact that I am using the observable collection in my StandardEngineeredView before navigating to the StandardEngineeredPrintView. Are you able to bind two views to the same data source? Am I doing something wrong that I am just not aware of?
I appreciate any suggestions and if you would like some more information/code just let say so.
Thank you!
Okay the solution was really simple. I my datagrid was set up incorrectly. I had to change it to this:
<DataGrid ItemsSource="{Binding ModelRevisionList}" AutoGenerateColumns="False">
<DataGrid.Columns>
<DataGridTextColumn Header="Date" Binding="{Binding Date}"/>
<DataGridTextColumn Header="Edited By" Binding="{Binding EditedBy}"/>
<DataGridTextColumn Header="Description" Binding="{Binding Description}"/>
</DataGrid.Columns>
</DataGrid>
Forgot the DataGrid.Columns
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