I have a shapefile at the county level and need to add 50+ shapefiles at the precinct level, but only if the county is clicked on. This is the function I have:
Private Sub xamWebMap_ElementClick(ByVal sender As Object, ByVal e As MapElementClickEventArgs) Dim map1 As XamWebMap = DirectCast(sender, XamWebMap) Dim i As Integer i += 1 For Each ele As MapElement In map1.Layers(0).Elements Dim builder As New StringBuilder() ele.Name = builder.Append("precinct" + i.ToString()).ToString i = i + 1 Next Dim elementName As String = e.Element.Name map1.WindowFit(e.Element) Dim newLayer As New MapLayer() newLayer.LayerName = elementName newLayer.VisibleFromScale = 3 map1.Layers.Add(newLayer) Dim reader As New ShapeFileReader() Dim converter As New DataMapping.Converter() reader.Uri = "Shapefiles/" + elementName reader.DataMapping = TryCast(converter.ConvertFromString("Caption=NAME"), DataMapping) newLayer.Reader = reader Dim layer As MapLayer = DirectCast(map1.Layers.FindName(elementName).ElementAt(0), MapLayer) Dim elements As IEnumerable(Of MapElement) = TryCast(layer.Elements.FindElement("Caption", "Name"), IEnumerable(Of MapElement)) For Each element As MapElement In layer.Elements pop.IsOpen = False element.IsClickable = False Next If elements.Count() > 0 Then pop.IsOpen = True Dim element As MapElement = TryCast(elements.ElementAt(0), MapElement) element.Caption = Nothing End If End Sub
I am naming all of the shapefiles precinct1, precinct2 and so on. Can anyone help?
Thanks
What's the behavior you are seeing for this code? Does it give an error? Or does the new layer just not show up? I'll see if I can put an example together for dynamically adding a layer. In the meantime, have you reviewed this information: http://help.infragistics.com/Help/NetAdvantage/DV/2009.2/CLR3.5/html/SL_DV_xamWebMap_Using_Multiple_Layers.html
-Graham
public partial class MainPage : UserControl
{
public MainPage()
InitializeComponent();
}
private void map1_WindowRectChanged(object sender, Infragistics.Silverlight.Map.MapWindowRectChangedEventArgs e)
XamWebMap map1 = (XamWebMap)sender;
if (Math.Round(map1.ScaleToZoom(e.WindowScale)) == 3)
MapLayer layer = (MapLayer)map1.Layers.FindName("worldLayer").ElementAt(0);
IEnumerable<MapElement> elements = layer.Elements.FindElement("Caption", "UNITED STATES") as IEnumerable<MapElement>;
if (elements.Count<MapElement>() > 0)
MapElement element = elements.ElementAt<MapElement>(0) as MapElement;
element.Caption = null;
private void map1_ElementClick(object sender, MapElementClickEventArgs e)
if (e.Element != null && e.Element.Caption == "UNITED STATES")
map1.WindowFit(e.Element);
MapLayer statesLayer = new MapLayer();
statesLayer.Name = "statesLayer";
statesLayer.VisibleFromScale = 2;
DataMapping.Converter converter = new DataMapping.Converter();
ShapeFileReader reader = new ShapeFileReader();
reader.Uri = "ShapeFiles/usa_st";
reader.DataMapping = (DataMapping)converter.ConvertFromString("Caption=STATE_ABBR");
statesLayer.Reader = reader;
map1.Layers.Add(statesLayer);
statesLayer.ImportAsync();
Here's a sample based on the link I provided above. I believe the crucial part you are missing is to tell the MapLayer to import its content from the shapefile. Something the control does for you with designtime layers.
This is the line you are looking for:
Note, it is important to call this after the reader has been added to the layer, and after the layer has been added to the map.
Let me know how it goes!
The new layer does not show up. The elementName that I'm passing is working correctly but apparently something isn't quite right.