Toggle Provider map on/off

[Charlie]

We have a RadMap that uses the Bing provider.  We want to allow our users to be able to toggle the map background on and off.  How can we do this?
We have a toggle button for that, here is the (non-working) code:

private void ToggleMapBtn_Click(object sender, System.Windows.RoutedEventArgs e)
{
    this.CustomerMap.Providers.Clear();
    if (this.ToggleMapBtn.IsChecked == true)
    {
        this.CustomerMap.Provider = this.bingProvider;
    }
    else
    {
        this.CustomerMap.Provider = this.emptyProvider;
    }
    this.CustomerDataLayer.Refresh();
}

Thank You.

[Jason D]

I would like to know that as well. For now, I've been setting the Opacity to 0.

[Charlie]

Thank you for that simple (hopefully temporary) solution.  

[Andrey]

Hello Charlie,

It is a known problem with using of the Clear method. We've fixed this problem already. We added new method RemoveAll to the providers collection. It should be used instead of Clear method. The fix will be available in the 2011.SP1 which will be available soon. 

Greetings,
Andrey Murzov
the Telerik team

[Charlie]

Thank you for the reply, Andrey.

[Jason D]

Bringing this one back. I am not currently subscribed so my last source code is Dec 2014. However the problem still exists even though this problem was found back in 2011.

Clear calls OnCollectionChanged with Reset and null for the oldItems.

RadMap.ProvidersCollectionChanged is checking for oldItems of not null, so Clear does not have the proper effect. Calling Remove on each provider works fine.

There is no RemoveAll listed in the MapProviderCollection.

[Petar Mladenov]

Hi Jason,

The RemoveAll method mentioned by Andrey Murzov is actually an IList extension method residing in Telerik.Windows.Controls.Map.

namespace Telerik.Windows.Controls.Map
{
    /// <summary>
    /// Holds extension methods for <see cref="IList"/> interface.
    /// </summary>
    public static class IListExtensions
    {
        /// <summary>
        /// Removes all items from the list.
        /// As opposed to Clear method raise CollectionChanged event with action Remove and OldItems property set.
        /// </summary>
        /// <param name="list">List to remove objects from.</param>
        public static void RemoveAll(this IList list)

So probably you only need to add the namespace with using in the top section of your file.

Regards,
Petar Mladenov
Telerik