topic Re: Magnifier tool and Dynamic layers in ArcGIS API for Silverlight Questions

Magnifier tool and Dynamic layers

MatthewPilgrim — Fri, 10 Dec 2021 20:51:26 GMT

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

Re: Magnifier tool and Dynamic layers

DominiqueBroux — Mon, 20 Dec 2010 11:28:45 GMT

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

If you are pointing one layer, you have to use a FeatureLayer instead of an ArcGISDynamicMapServiceLayer.

Is there something server side that limits the zoom factor?

Might be a minimum resolution set on the layer.

Re: Magnifier tool and Dynamic layers

MatthewPilgrim — Fri, 10 Dec 2021 20:51:28 GMT

Thanks,

I've just tried:

<esri:ArcGISDynamicMapServiceLayer ID="MagnifyImageLayer"
                        Url="http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Specialty/ESRI_StatesCitiesRivers_USA/MapServer/0" />
<esri:ArcGISDynamicMapServiceLayer ID="MagnifyImageLayer"
                        Url="http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Specialty/ESRI_StatesCitiesRivers_USA/MapServer/1" />

And get the same error message. Can you elaborate on what should/shouldn't work please?

I'll check the resolution issue.

Thanks again, Matt

Re: Magnifier tool and Dynamic layers

DominiqueBroux — Mon, 20 Dec 2010 11:42:11 GMT

<esri:ArcGISDynamicMapServiceLayer ID="MagnifyImageLayer" Url="http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Specialty/ESRI_StatesCitiesRivers_USA/MapServer/0" />

http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Specialty/ESRI_StatesCitiesRivers_USA/MapServer/0 is the URL of a FeatureLayer not a map service layer.

So, should work:
<esri:FeatureLayerID="MagnifyImageLayer" Url="http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Specialty/ESRI_StatesCitiesRivers_USA/MapServer/0" />

or

<esri:ArcGISDynamicMapServiceLayer ID="MagnifyImageLayer" Url="http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Specialty/ESRI_StatesCitiesRivers_USA/MapServer" VisibleLayers="0" />

Re: Magnifier tool and Dynamic layers

MatthewPilgrim — Mon, 20 Dec 2010 12:08:22 GMT

Thanks,

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

Matt