Identify problem

Hello,

Is does anyone has another idea?
Where is the ESRI teams? please help-me.

I'm not sure, but I think the feature layer is causing the problem. Could you test by using an ArcGISDynamicMapServiceLayer in your xaml and then identifying using that layer?

It does not work also 😞

It no longer gives the error before, but the Identify table does not contains anything.

I'm not sure, but I think the feature layer is causing the problem. Could you test by using an ArcGISDynamicMapServiceLayer in your xaml and then identifying using that layer?

I had already tested and does not work 😞

it gives me this error :
ESRI.ArcGIS.Client.FeatureLayer does not contain a definition for 'VisibleLayers' and no extension method 'VisibleLayers' accepting a first argument of type 'ESRI.ArcGIS.Client.FeatureLayer' could be found (are you missing a using directive or an assembly reference?)

After the identify parameters, you need to add back this, too. This is what adds the layers to the identify task.

if (dynamicServiceLayer.VisibleLayers != null)
foreach (int x in dynamicServiceLayer.VisibleLayers)
identifyParams.LayerIds.Add(x);
if (dynamicServiceLayer.VisibleLayers.Length == 0) return;

j'ai fait ça:

            FeatureLayer dynamicServiceLayer = (FeatureLayer)MyMap.Layers["Limites_Administratives"];
            ESRI.ArcGIS.Client.Geometry.MapPoint clickPoint = e.MapPoint;

            ESRI.ArcGIS.Client.Tasks.IdentifyParameters identifyParams = new IdentifyParameters()
            {
                Geometry = clickPoint,
                MapExtent = MyMap.Extent,
                Width = (int)MyMap.ActualWidth,
                Height = (int)MyMap.ActualHeight,
                LayerOption = LayerOption.visible,
                SpatialReference = MyMap.SpatialReference,

            };

            IdentifyTask identifyTask = new IdentifyTask    ("http://romulus/ArcGIS/rest/services/Limites_Administratives_Luxembourg/MapServer");
            identifyTask.ExecuteCompleted += IdentifyTask_ExecuteCompleted;
            identifyTask.Failed += IdentifyTask_Failed;
            identifyTask.ExecuteAsync(identifyParams);


            GraphicsLayer graphicsLayer = MyMap.Layers["Limites_Administratives"] as GraphicsLayer;
   ESRI.ArcGIS.Client.Graphic graphic = new ESRI.ArcGIS.Client.Graphic()
            {
                Geometry = clickPoint,
                Symbol = LayoutRoot.Resources["DefaultPictureSymbol"] as ESRI.ArcGIS.Client.Symbols.Symbol
            };

            graphicsLayer.Graphics.Add(graphic);

But there are no results, the table of Identify is empty.
Someone have another idea? please help me.

In your original code, you used this to define the url, which is the way I did it.

"ArcGISDynamicMapServiceLayer dynamicServiceLayer = (ArcGISDynamicMapServiceLayer)MyMap.Layers["Limites_Administratives"];"

But you don't have an ArcGISDynamicMapServiceLayer defined in your xaml, because you're using feature layers. That's probably why your identify task didn't return any results.

I would suggest reverting to your original identify code, but use "FeatureLayer" instead of "ArcGISDynamicMapServiceLayer" so that you're referencing the same rest services that your map is using.

I'm not a great programmer either, so hopefully that'll work for you. Let me know.

Thank you very much for your reply, I'll see and I'll come back to inform you.

I don't understand how the identifier will manage the visibility of layers, if I give the url of the service, while in the service all layers are checked.

That is why I used the code that is in the top position in this post

In your original code, you used this to define the url, which is the way I did it.

"ArcGISDynamicMapServiceLayer dynamicServiceLayer = (ArcGISDynamicMapServiceLayer)MyMap.Layers["Limites_Administratives"];"

But you don't have an ArcGISDynamicMapServiceLayer defined in your xaml, because you're using feature layers. That's probably why your identify task didn't return any results.

I would suggest reverting to your original identify code, but use "FeatureLayer" instead of "ArcGISDynamicMapServiceLayer" so that you're referencing the same rest services that your map is using.

I'm not a great programmer either, so hopefully that'll work for you. Let me know.

Yes, I know that my layers are called as features layers, because I am appealing to the layers attribute table ...
What is the code that I had deleted and it called identify parameter .
And how to Reference the new URL.
Please help me, I'm not strong in programming.

Please help me.

Your original identify code referenced a dynamic service layer. In the image you attached showing your xaml, it looks like all your data layers are feature layers, so changing your url to the full address fixes that. But it looks like you removed the code that adds the layers to the identify parameters. This is what you had previously, so you'll need to change it to reference the new url.

     if (dynamicServiceLayer.VisibleLayers != null)
     foreach (int x in dynamicServiceLayer.VisibleLayers)
     identifyParams.LayerIds.Add(x);
     if (dynamicServiceLayer.VisibleLayers.Length == 0) return;

and when I use the code in the attached file, it works great, but it makes me appear in the combobox all layers, even that they are not checked in the list of layers.

What do you think?

Thank you for your help.

identify_Code.doc

Thank you for your answer.

I got the same thing when I removed the condition :
"if (dynamicServiceLayer.VisibleLayers.Length == 0) return;"

Of course I have verified that the layers appear, you can see the result in the image below.

but I noticed that I receive the same result that is in the picture when I click outside the limits of my layers, I would say to the outside of the administrative boundary of Luxembourg, or layer it no exists.

So maybe I had made a mistake in this line:

IdentifyTask identifyTask = new IdentifyTask (dynamicServiceLayer.Url);
or:
ArcGISDynamicMapServiceLayer dynamicServiceLayer = (ArcGISDynamicMapServiceLayer) MyMap.Layers ["Limites_Administratives"];

I put an image of a part of my code

Map_Code.png

project_view.jpg

You have an if statement that exits out of the code if there are no visible layers.

"if (dynamicServiceLayer.VisibleLayers.Length == 0) return;"

I thought maybe your data layers were not loading correctly. Have you checked to make sure they are loading?

Well, before noticing that the identifier brings up all the layers, without taking into consideration those that are not checked, the Identify walk very well. And I get no error, that is why I am lost

May be I misunderstood the first part of your sentence.

Are you getting an error anywhere? Have you put a breakpoint in your code to make sure the visible layers are being populated? Without an error it's hard to know where things are going wrong.

I did the same thing as what you have presented here, but there is nothing that displays in my Identify.

Enclosed is my code and the result.

Thank you for your help.

code_Identify.docx

idenfity_result.png

I found the problem. It was in some previous code.

Now that I can actually identify all visible layers, I realized there are two layers that I don't want to identify. So I found some code on another thread that checks visibility and can also exclude layers, and now I'm getting duplicate results (actually it shows up six times) in the drop down list for the results window. Do you know why this would happen? I only have the layer in the map one time.

I tried to paste in the new code, but it makes my post too long. How do I attach code so that it shows up in a box?

Got it. I misunderstood. I changed to visible and now it works as I need it. Thanks for your help.

I'm using all.

You have to use the 'visible' option (not all) : LayerOption = LayerOption.visible,

With 'all', all layers are identifiable.

I'm using all.

Here's what I've got now.

private void QueryPoint_Click(object sender, ESRI.ArcGIS.Client.Map.MouseEventArgs e)
{
if (IdentifyBtn.IsChecked.Value)
{
ArcGISDynamicMapServiceLayer EMDataLayer = (ArcGISDynamicMapServiceLayer)Map.Layers["Data"];

IdentifyBorder.Visibility = System.Windows.Visibility.Visible;

ESRI.ArcGIS.Client.Geometry.MapPoint clickPoint = e.MapPoint;

ESRI.ArcGIS.Client.Tasks.IdentifyParameters identifyParams = new IdentifyParameters()
{
Geometry = clickPoint,
MapExtent = Map.Extent,
Width = (int)Map.ActualWidth,
Height = (int)Map.ActualHeight,
LayerOption = LayerOption.all,
SpatialReference = Map.SpatialReference
};

if (EMDataLayer.VisibleLayers != null)
foreach (int x in EMDataLayer.VisibleLayers)
identifyParams.LayerIds.Add(x);

IdentifyTask identifyTask = new IdentifyTask(EMDataLayer.Url);
identifyTask.ExecuteCompleted += IdentifyTask_ExecuteCompleted;
identifyTask.Failed += IdentifyTask_Failed;
identifyTask.ExecuteAsync(identifyParams);

GraphicsLayer graphicsLayer = Map.Layers["IDGraphicsLayer"] as GraphicsLayer;
graphicsLayer.ClearGraphics();
ESRI.ArcGIS.Client.Graphic graphic = new ESRI.ArcGIS.Client.Graphic()
{
Geometry = clickPoint,
Symbol = LayoutRoot.Resources["IDPictureSymbol"] as ESRI.ArcGIS.Client.Symbols.Symbol
};
graphicsLayer.Graphics.Add(graphic);
}

LayerOption = LayerOption.all,

You have to use the visible option.

That fixed the error, but now it seems that the task doesn't use that code. I'm getting all layers whether or not they're visible. I put a break at the foreach statement, but it never gets hit.

Yes. I didn't read the example carefully enough. I made that changed and used the ID from xaml, but now I'm getting a NullReferenceException on this part.

foreach (int x in EMDataLayer.VisibleLayers)
identifyParams.LayerIds.Add(x);

VisibleLayers can be null if you never changed the sublayer visibilities. In this case the default sublayer visibilities are used.

So code like :

if (EMDataLayer.VisibleLayers != null)
  foreach (int x in EMDataLayer.VisibleLayers)
    identifyParams.LayerIds.Add(x);

should work.

Yes. I didn't read the example carefully enough. I made that changed and used the ID from xaml, but now I'm getting a NullReferenceException on this part.

          foreach (int x in EMDataLayer.VisibleLayers)
          identifyParams.LayerIds.Add(x);

Here's the full code.

private void QueryPoint_Click(object sender, ESRI.ArcGIS.Client.Map.MouseEventArgs e)
        {
            if (IdentifyBtn.IsChecked.Value)
            {
                ArcGISDynamicMapServiceLayer EMDataLayer = (ArcGISDynamicMapServiceLayer)Map.Layers["Data"];

                IdentifyBorder.Visibility = System.Windows.Visibility.Visible;

                ESRI.ArcGIS.Client.Geometry.MapPoint clickPoint = e.MapPoint;

                ESRI.ArcGIS.Client.Tasks.IdentifyParameters identifyParams = new IdentifyParameters()
                {
                        Geometry = clickPoint,
                        MapExtent = Map.Extent,
                        Width = (int)Map.ActualWidth,
                        Height = (int)Map.ActualHeight,
                        LayerOption = LayerOption.all,
                        SpatialReference = Map.SpatialReference
                };

                foreach (int x in EMDataLayer.VisibleLayers)
                identifyParams.LayerIds.Add(x);

                IdentifyTask identifyTask = new IdentifyTask(EMDataLayer.Url);
                identifyTask.ExecuteCompleted += IdentifyTask_ExecuteCompleted;
                identifyTask.Failed += IdentifyTask_Failed;
                identifyTask.ExecuteAsync(identifyParams);

                GraphicsLayer graphicsLayer = Map.Layers["IDGraphicsLayer"] as GraphicsLayer;
                graphicsLayer.ClearGraphics();
                ESRI.ArcGIS.Client.Graphic graphic = new ESRI.ArcGIS.Client.Graphic()
                {
                        Geometry = clickPoint,
                        Symbol = LayoutRoot.Resources["IDPictureSymbol"] as ESRI.ArcGIS.Client.Symbols.Symbol
                };
                graphicsLayer.Graphics.Add(graphic);
            }

I'm getting the error "Cannot convert type 'ESRI.ArcGIS.Client.LayerInfo' to 'ESRI.ArcGIS.Client.ArcGISDynamicMapServiceLayer'.

This is the line with the problem.

ArcGISDynamicMapServiceLayer EMDataLayer = (ArcGISDynamicMapServiceLayer)EMDataLayer.Layers[20];

You need to get the layer from the Map, not from the layer itself.

ArcGISDynamicMapServiceLayer EMDataLayer = (ArcGISDynamicMapServiceLayer)myMap.Layers[20];

Though, the code will be clearer if you give an ID to your layer in XAML, so you can reuse this ID by code:

ArcGISDynamicMapServiceLayer EMDataLayer = (ArcGISDynamicMapServiceLayer)myMap.Layers["MyLayerId"];

I also need to identify layers that are not visible initially. When I tried to create a variable for my map layers using the suggestions in this thread, I'm getting the error "Cannot convert type 'ESRI.ArcGIS.Client.LayerInfo' to 'ESRI.ArcGIS.Client.ArcGISDynamicMapServiceLayer'.

This is the line with the problem.

ArcGISDynamicMapServiceLayer EMDataLayer = (ArcGISDynamicMapServiceLayer)EMDataLayer.Layers[20];