Magnifier tool and Dynamic layers

MatthewPilgrim

EDIT: This works when pointing at all layers but not one layer i.e. Mapserver/0
Hi,

I'm sure I read somewhere that the ESRI Magnifier tool works with multiple layers and dynamic layers. However I can't seem to get dynamic layers to display. Here is a very simple example based on the sample server.

XAML:

<UserControl x:Class="MapApp.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:esri="http://schemas.esri.com/arcgis/client/2009" 
    xmlns:esriSymbols="clr-namespace:ESRI.ArcGIS.Client.Symbols;assembly=ESRI.ArcGIS.Client"
    mc:Ignorable="d"
    d:DesignHeight="300" d:DesignWidth="400">

    <Grid x:Name="LayoutRoot" Background="White">
        <esri:Map x:Name="MyMap" MouseLeftButtonDown="MyMap_MouseLeftButtonDown">
            <esri:Map.Layers>
                <esri:ArcGISDynamicMapServiceLayer ID="StreetMapLayer" Url="http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Specialty/ESRI_StatesCitiesRivers_USA/MapServer" /> 
            </esri:Map.Layers>
        </esri:Map>
        <Canvas>
            <esri:Magnifier x:Name="MyMagnifier" ZoomFactor="2" Map="{Binding ElementName=MyMap}" Canvas.ZIndex="10">
                <esri:Magnifier.Layers>
                    <esri:ArcGISDynamicMapServiceLayer ID="MagnifyImageLayer"
                        Url="http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Specialty/ESRI_StatesCitiesRivers_USA/MapServer/0" />
                </esri:Magnifier.Layers>
            </esri:Magnifier>
        </Canvas>
    </Grid>
</UserControl>

Code behind:

using System;
using System.Net;
using System.Windows.Controls;
using System.Windows.Input;

namespace MapApp
{
    public partial class MainPage : UserControl
    {
        public MainPage()
        {
            InitializeComponent();
        }
        private void MyMap_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            MyMagnifier.Enabled = !MyMagnifier.Enabled;
        }
    }
}

And the error message:

Line: 56 
Error: Unhandled Error in Silverlight Application  
Code: 4004  
Category: ManagedRuntimeError  
Message: System.ArgumentException: Service URL does not contain any layer. 
at ESRI.ArcGIS.Client.Layer.OnInitializationFailed(EventArgs e) 
at ESRI.ArcGIS.Client.Layer.Initialize() 
at ESRI.ArcGIS.Client.ArcGISDynamicMapServiceLayer.<>n__FabricatedMethod8() 
at ESRI.ArcGIS.Client.ArcGISDynamicMapServiceLayer.<>c__DisplayClass6.<MapServiceInfoInitFailed>b__4()  

Note I've tried pointing the magnifier at "MapServer" which works but "MapServer/0" doesn't.

Should pointing at one layer work?

Secondly, with our own map server I can load the dynamic layers with a zoom level of 1.5 but when this is increased to say 2.0 they stop appearing. Is there something server side that limits the zoom factor?
Thanks, Matt

MatthewPilgrim

Thanks,

My mistake!  Your second example gave me the clue I needed.

Matt