WPF Geocode radMap error

[Lindell]

Hi,

I'm new to developing and have downloaded a trial of the WPF controls.I am trying to follow an example explaining how to use the geocode features. I have tried a few different ways but i always get the same error  "Object reference not set to an instance of an object." when it tries to run the code

Me.geocodeProvider.GeocodeAsync(geocodeRequest)

here is my full code any help would be greatly appreciated.

XAML

<Window x:Class="MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
           Title="MainWindow" Height="480" Width="620">

    <telerik:RadMap x:Name="RadMap" Height="540" VerticalAlignment="Top" ZoomLevel="7" Center="53.7500, -1.8333" MouseLocationIndicatorVisibility="Visible" NavigationVisibility="Collapsed" MapMouseDoubleClick="radMap1_MapMouseDoubleClick" MouseDoubleClickMode="None">
        <telerik:RadMap.Provider>
            <telerik:BingMapProvider Mode="Aerial" IsLabelVisible="True"
           IsTileCachingEnabled="True"
           ApplicationId="MY BING MAPS KEY" />

            </telerik:RadMap.Provider>

        <telerik:InformationLayer x:Name="informationlayer">

            </telerik:InformationLayer>


            ></telerik:RadMap>



</Window>

VB

Imports Telerik.Windows.Controls.Map

Partial Public Class MainWindow
    Dim geocodeProvider As BingGeocodeProvider
    Dim geocodeLocation As Location

    Public Sub New()
        InitializeComponent()
    End Sub

    Private Sub WindowLoaded(ByVal sender As Object, ByVal e As RoutedEventArgs)






        ' Init geocode provider.
        geocodeProvider = New BingGeocodeProvider() With { _
         .ApplicationId = "MY BING MAPS KEY", _
         .MapControl = Me.radMap _
        }
        AddHandler Me.geocodeProvider.GeocodeCompleted, AddressOf Me.Provider_GeocodeCompleted
        ' Me.geocodeProvider.GeocodeCompleted += New EventHandler(Of GeocodeCompletedEventArgs)(AddressOf Provider_GeocodeCompleted)
    End Sub


    Private Sub BeginGeocodingRequest()
        Dim address As New Address() With { _
         .CountryRegion = "UK", _
         .PostalCode = "LS17 6HA" _
        }

        Dim geocodeRequest As New GeocodeRequest() With { _
         .Address = address _
        }
        Me.geocodeProvider.GeocodeAsync(geocodeRequest)
    End Sub

    Private Sub Provider_GeocodeCompleted(ByVal sender As Object, ByVal e As GeocodeCompletedEventArgs)
        Dim response As GeocodeResponse = e.Response
        If response.Results.Count > 0 Then
            Me.radMap.SetView(response.Results(0).BestView)

            ' Me.informationlayer.ItemsSource = response.Results(0).Locations
            Me.informationlayer.ItemsSource = response.Results(0).Locations
        End If
    End Sub

    Private Sub radMap1_MapMouseDoubleClick(ByVal sender As System.Object, ByVal eventArgs As Telerik.Windows.Controls.Map.MapMouseRoutedEventArgs)
        Dim address As New Address() With { _
                .CountryRegion = "UK", _
                .PostalCode = "LS17 6HA" _
               }

        Dim geocodeRequest As New GeocodeRequest() With { _
         .Address = address _
        }
        Me.geocodeProvider.GeocodeAsync(geocodeRequest)
    End Sub
End Class

Thanks :)

[Andrey]

Hi Lindell,

It looks like you don't attach the Loaded event to your WindowLoaded event handler. So, the error occurs when you try to use unassigned geocodeProvider object.

Greetings,
Andrey Murzov
the Telerik team

[Yavor]

Hi Lindell,

It looks like you don't attach the Loaded event to your WindowLoaded event handler. So, the error occurs when you try to use unassigned geocodeProvider object.

Greetings,
Andrey Murzov
the Telerik team

[Lindell]

Thanks for your advice :)