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Zoom to featurelayer extent issue

bayramüçüncü

In the following code I wanna zoom to selected city. But zoom is unsuccessful.

        
        private void ctxQueryComBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            City selectedCity = ctxQueryComBox.SelectedItem as City;
            FeatureLayer layer = Map.Layers["cityFeature"] as FeatureLayer;

            if (layer == null || selectedCity ==null)
                return;

            layer.Where = string.Format("CityId = '{0}'", selectedCity.Id); // query
            layer.Visible = true;
            layer.Update();
            
            Map.Extent = layer.Geometry.Extent;

            cxDatagrid.GraphicsLayer = layer;

        }

when I selected the city from the combobox, zoom not working.

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DominiqueBroux

Ohh yes.
Looks like I got lost between C# and VB syntax.

Sorry about that.

KenDoman

I tried that one, and it still gave me the same error.

After searching around, I eventually found out how to set up the event handler in vb.

Dim featureLayer As FeatureLayer = New FeatureLayer() With {.ID = "DataLayer"}
' skip other setup code
AddHandler featureLayer.UpdateCompleted, AddressOf FeatureLayer_UpdateCompleted

' a little later...
Private Sub FeatureLayer_UpdateCompleted(ByVal sender As Object, ByVal e As EventArgs)
    Dim myExtent As ESRI.ArcGIS.Client.Geometry.Envelope = CType(sender, FeatureLayer).FullExtent
    If myExtent IsNot Nothing Then
        MyMap.ZoomTo(myExtent)
    End If
End Sub

The full extent is empty, but at least it's firing now.

DominiqueBroux

The syntax to wire up an handler to an event is '+=' not '='

featureLayer.UpdateCompleted += Sub(snd, evt) ......

KenDoman

Here's my code in VB.NET

            Dim featureLayer As FeatureLayer = New FeatureLayer() With {.ID = "DataLayer"}
            featureLayer.UpdateCompleted = Sub(snd, evt) MyMap.ZoomTo(featureLayer.FullExtent)

Here's the error that's returned:

'Public Event UpdateCompleted(sender As Object, e As System.EventArgs)' is an event, and cannot be called directly. Use a 'RaiseEvent' statement to raise an event.

DominiqueBroux

Likely there is a syntax error in your code. You should be able to wire up an handler to the event UpdateCompleted.
How does your code look?

KenDoman

When I try this code, I get this error:

'Public Event UpdateCompleted(sender As Object, e As System.EventArgs)' is an event, and cannot be called directly. Use a 'RaiseEvent' statement to raise an event.

Basically, I can't programmatically add an UpdateCompleted event to a new Feature Layer.

JoeHershman

Have you tried

layer.UpdateCompleted += (snd, evt) => { Map.Extent = layer.FullExtent; };

Good Luck

bayramüçüncü

In order to use the 'Updated' FeatureLayer you need to add a handler for the UpdateComplete Event and than have your code run inside that handler

Something along these lines
layer.UpdateComplete += (s,e) => {
         Map.Extent = layer.Geometry.Extent;
                                 };
layer.Update();

I tried these codes to order,

layer.UpdateCompleted += (snd, evt) => { new Envelope(399368, 4466618, 568578, 4568478); };
layer.UpdateCompleted += (snd, evt) => { Map.Extent = layer.Geometry.Extent; };
layer.UpdateCompleted += (snd, evt) => { Map.ZoomTo(mevt.layer.Geometry.Extent); };
layer.UpdateCompleted += (snd, evt) => { Map.ExtentChanged += (msnd, mevt) => { Map.ZoomTo(mevt.NewExtent);}; Map.Extent = layer.Geometry.Extent; };

but not worked

JoeHershman

In order to use the 'Updated' FeatureLayer you need to add a handler for the UpdateComplete Event and than have your code run inside that handler

Something along these lines


layer.UpdateComplete += (s,e) => {
         Map.Extent = layer.Geometry.Extent;
                                 };
layer.Update();

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