[GIS] Return symbols for geometries from Dynamic Service Layer

arcgis-silverlight-api

I'm using the ESRI Silverlight API and I've got a question regarding tasks such as identifies and queries that return geometry from a Dynamic Service Layer. These tasks return graphic geometry but no symbol, so in order to display that graphic in another GraphicsLayer, I have to have a symbol setup client side and then assign that symbol to the graphic. What I'm wondering is if there is any way to not only pull back the geometry from the Dynamic Service, but also pull back symbols?

The only approach I've been able to come up with is to access the FeatureLayer via the REST endpoint and pull back it's renderer to assign it to my GraphicsLayer. This works, but limits me to only the symbols specified in the Dynamic layer (I can't use a single graphics layer for results from multiple Feature Layers). This also seems fairly complicated to get to where I'm wanting to be.

I'm thinking there might not be any way to do this, but wanted to ask and see if anyone has any ideas. Thanks!

Best Answer

Depending on the complexity of the symbol, you could hit query the REST end point with a WebClient request. Then you can parse the Json text that's returned. From that you can create a symbol and assign it to each graphic before adding it to the graphics layer.

http://help.arcgis.com/en/arcgisserver/10.0/apis/rest/ http://help.arcgis.com/en/arcgisserver/10.0/apis/rest/fslayer.html

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[GIS] Creating Chart in Silverlight that is bound to Layer in Map

I did a similar kind of thing some time back. I did this for a featurelayer/graphics layer using ESRI ArcGIS API

Binding the feature/graphics layer attributes to a data grid (did not use the featuredata grid ESRI provides) Then bind a specific grid column to a chart. Infact the way I did was the user can click on a column and the chart would display that column (simple bar chart). So you click a different column the chart changes.

This is how i did it C# code I have a method which executes a GP task that returns a graphics layer I iterate each graphic, create an observable collection and bind the observable collection to the data grid. there are other ways to bind but this worked for me when used with the chart.

    // GP task that returns graphics
    public void Execute(object parameter)
    {
        Geoprocessor getData = new Geoprocessor();
        getData.Url = "GP task URL...";
        getData.Failed += this.GP_Failed;
        getData.GetResultDataCompleted += this.GP_GetResultDataCompleted;
        getData.GetResultDataAsync(this.jobId, "parameter");            
    }

    // The event raised when GP task successful
    void GP_GetResultDataCompleted(object sender, GPParameterEventArgs e)
    {
        object attributeValue = null;

        // Internal class object
        CategoryAttributes categoryAttributes = new CategoryAttributes();

        if (e.Parameter is GPFeatureRecordSetLayer)
        {
            GPFeatureRecordSetLayer gpLayer = e.Parameter as GPFeatureRecordSetLayer;
         
            // Create a new graphics layer
            GraphicsLayer graphicsLayer = new GraphicsLayer();
            graphicsLayer.ID = "GraphicsLayer";

            // Add the graphics to the graphics layer and an observable collection that is binded to a data grid
            foreach (Graphic graphic in gpLayer.FeatureSet.Features)
            {
                CategoryAttribute categoryAttribute = new CategoryAttribute();

                attributeValue = g.Attributes.Where(x => x.Key.Contains("CategoryCount")).SingleOrDefault().Value;
                if (attributeValue != null)
                {
                    categoryAttribute.Count = attributeValue.ToString();
                }

                attributeValue = g.Attributes.Where(x => x.Key.Contains("CategoryValue")).SingleOrDefault().Value;
                if (attributeValue != null)
                {
                    categoryAttribute.Value = attributeValue.ToString();
                }

                attributeValue = g.Attributes.Where(x => x.Key.Contains("CategoryAmount")).SingleOrDefault().Value;
                if (attributeValue != null)
                {
                    categoryAttribute.Amount = attributeValue.ToString();
                }
                categoryAttributes.Add(categoryAttribute);

                graphicsLayer.Graphics.Add(graphic);
            }

            // Add to map
            this.myMap.Layers.Add(graphicsLayer);

            // Bind data to data grid
            this.MyDataGrid.ItemsSource = categoryAttributes;
        }
    }

    // Internal classes for creating the observable collection
    internal class CategoryAttributes : ObservableCollection<CategoryAttribute>
    {
    }
    internal class CategoryAttribute
    {
        public double CategoryCount { get; set; }
        public double CategoryValue { get; set; }
        public double CategoryAmount { get; set; }
    }

[GIS] How to disable Mouse Wheel zoom functionality in ArcGIS Silverlight

I haven't tried it, but you could try setting the Map's ZoomFactor property to ~~zero~~ 1 (storing the old value) while your measurement tool is active.

http://help.arcgis.com/en/webapi/silverlight/apiref/ESRI.ArcGIS.Client~ESRI.ArcGIS.Client.Map~ZoomFactor.html

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