Bing Map Provider and Tile Caching

[Simon]

If I set my provider to the BingMapProvider and set the IsTileCachingEnabled to true, when I exit my application I still have threads running that stop my application from fully closing.

Setting the IsTileCachingEnabled to false at the start avoids the problem, but is there a way that I can clean up the threads being used to provide the cached tiles?

I am using your WPF control within a windows forms application using System.Windows.Forms.Integration.ElementHost

Thanks
Simon

[Andrey]

Hello Simon,

Thank you for the feedback.
There is a peculiarity of using map component within a windows forms application. You should call the Dispatcher.InvokeShutdown method for closing it completely with running threads which use the tile caching.
The sample code is the following:

using System.ComponentModel;
using System.Windows.Forms;

namespace WindowsFormsMap
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        protected override void OnClosing(CancelEventArgs e)
        {
            base.OnClosing(e);

            this.elementHost1.Child.Dispatcher.InvokeShutdown();
        }
    }
}

All the best,
Andrey Murzov
the Telerik team

[Simon]

I have tried the above, and it works fine as long as you totally quit the application.

As I have an MDI type interface, the window can be closed and another one opened.  In this case, I then get an exception

   at MS.Internal.Data.DataBindEngine.GetDefaultValueConverter(Type sourceType, Type targetType, Boolean targetToSource)
   at System.Windows.Data.BindingExpression.SetupDefaultValueConverter(Type type)
   at MS.Internal.Data.PropertyPathWorker.ReplaceItem(Int32 k, Object newO, Object parent)
   at MS.Internal.Data.PropertyPathWorker.UpdateSourceValueState(Int32 k, ICollectionView collectionView, Object newValue, Boolean isASubPropertyChange)
   at MS.Internal.Data.PropertyPathWorker.AttachToRootItem(Object rootItem)
   at MS.Internal.Data.ClrBindingWorker.AttachDataItem()
   at System.Windows.Data.BindingExpression.Activate(Object item)
   at System.Windows.Data.BindingExpression.AttachToContext(AttachAttempt attempt)
   at System.Windows.Data.BindingExpression.AttachOverride(DependencyObject target, DependencyProperty dp)
   at System.Windows.Data.BindingExpressionBase.Attach(DependencyObject target, DependencyProperty dp)
   at System.Windows.Data.BindingExpressionBase.OnAttach(DependencyObject d, DependencyProperty dp)
   at System.Windows.DependencyObject.SetValueCommon(DependencyProperty dp, Object value, PropertyMetadata metadata, Boolean coerceWithDeferredReference, OperationType operationType, Boolean isInternal)
   at System.Windows.DependencyObject.SetValue(DependencyProperty dp, Object value)
   at System.Windows.Data.BindingOperations.SetBinding(DependencyObject target, DependencyProperty dp, BindingBase binding)
   at System.Windows.FrameworkElement.SetBinding(DependencyProperty dp, BindingBase binding)
   at Telerik.Windows.Controls.PropertyChangedRegistrar.RegisterForNotification(FrameworkElement element, String propertyPath, DependencyProperty listener)
   at Telerik.Windows.Controls.Map.MapShape..ctor()
   at Telerik.Windows.Controls.Map.MapPolyline..ctor()
   at Apteco.Discoverer.Plugins.Map.Visualisation.RadMapWPF.RadMapControl.SelectionLayer_Initialized(Object sender, EventArgs e) in C:\Visual Studio Projects\Discoverer\Discoverer\Apteco.Discoverer.Plugins.Map\Visualisation\RadMapWPF\RadMapControl.xaml.cs:line 336
   at System.Windows.FrameworkElement.RaiseInitialized(EventPrivateKey key, EventArgs e)
   at System.Windows.FrameworkElement.OnInitialized(EventArgs e)
   at Telerik.Windows.Controls.Map.InformationLayer.OnInitialized(EventArgs e)
   at System.Windows.FrameworkElement.TryFireInitialized()
   at System.Windows.FrameworkElement.EndInit()
   at System.Windows.Controls.ItemsControl.EndInit()
   at System.Windows.Markup.BamlRecordReader.ElementEndInit(Object& element)

I don't think the actual exception is important, just the fact that we may have disposed of more than we wanted to in the InvokeShutdown

[Andrey]

Hello Simon,

Thank you for the feedback.
For your application type you can call the Dispatcher.InvokeShutdown method when the ApplicationExit event occurs. The sample code is below.

using System;
using System.Windows.Forms;
using System.Windows.Threading;

namespace MDIMap
{
    public partial class MapForm : Form
    {
        public MapForm()
        {
            InitializeComponent();

            System.Windows.Forms.Application.ApplicationExit += new EventHandler(OnApplicationExit);
        }

        private void OnApplicationExit(object sender, EventArgs e)
        {
            Dispatcher dispatcher = this.elementHost1.Child.Dispatcher;
            if (!dispatcher.HasShutdownStarted)
            {
               dispatcher.InvokeShutdown();
            }
        }
    }
}

Best wishes,
Andrey Murzov
the Telerik team