Clustering off/on

Question

This seems like an simple problem, but I have to ask. I am simply trying to allow for clustering to be turned off and on for a query results graphic layer. The graphic layer has simple clustering enabled as default within the XAML.

I am providing a checkbox to allow for someone to turn the clustering off or on for the graphic layer.

I can figure out how to shut off the clustering using the simple code below, however I am not sure what would be the best way to allow for someone to turn the clustering back on.

For clusting off I am using a simple
Checkbox unchecked
GraphicsLayer layer = Map.Layers["QueryGraphicLayer"] as GraphicsLayer;
Layer.Clusterer = null

Does anyone have an example code of how they allow users to turn simple clustering back on for a layer. I was trying to use the example below, however this is for a specific custom clustering using an aggragete value field. I am simple trying to enable simple clustering.

ChristopherHill · Answer

We have a sample on our sdk site that does exactly what you are trying to do. 
http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#CustomClusterer

gabrielvazquez · Answer

Darina, 
Np on the time of your response. I appreciate your help, I consider my self a very novice coder, so your help is much appreciated. I was able to get it work. I made some minor changes to the code and where I placed it, but I was able to get it to work.

Thanks again for your help.

DarinaTchountcheva · Answer

Gabriel,

I know I am replying a little late (it's summer time), but you can either add the checkbox handlers in code behind in Map_Loaded instead in xaml, or you can check in the Check/Uncheck event handlers if the Map object is null, and skip the code if it is. Cluster cluster;

private void Map_Loaded(object sender, RoutedEventArgs e)
        {
            
            GraphicsLayer gl = Map.Layers["QueryGraphicsLayer"] as GraphicsLayer;

//preserve the clusterer object to use it when you want to turn the clusering back on
            cluster = gl.Clusterer;

//this is the symbol to be used for the single points that don't get clustered
            //it can be defined in your xaml, or you can difine it in code
     //if it is in your xaml you get it this way:
            SimpleRenderer simpleRenderer = LayoutRoot.Resouces["simpleRenderer"] as SimpleRenderer;

//you can use a UniqueValueRenderer also, or not use anything
            //if you don't specify the renderer, the single points will be red circles (I think)

gl.Renderer = simpleRenderer; 
            clusterCheckBox.Checked += new RoutedEventHandler(clusterCheckBox_Checked);
            clusterCheckBox.Unchecked += new RoutedEventHandler(clusterCheckBox_Unchecked);
            
        }

private void clusterCheckBox_Unchecked(object sender, RoutedEventArgs e)
        {
            //check first if Map is null
            if (Map == null) return;
            GraphicsLayer gl = Map.Layers["QueryGraphicsLayer"] as GraphicsLayer;
            //check if gl is null
            if (gl == null) return;

gl.Clusterer = null;

UniqueValueRenderer uniqueRenderer = LayoutRoot.Resources[QueryUniqueValueRenderer"] as UniqueValueRenderer;
            gl.Renderer = uniqueRenderer;   
           
        }

private void clusterCheckBox_Checked(object sender, RoutedEventArgs e)
        {
            //check first if Map is null
            if (Map == null) return;
            GraphicsLayer gl = Map.Layers["QueryGraphicsLayer"] as GraphicsLayer;
            //check if gl is null
            if (gl == null) return;

GraphicsLayer gl = Map.Layers["QueryGraphicsLayer"] as GraphicsLayer;
            gl.Clusterer = clusterer;

SimpleRenderer simpleRenderer = LayoutRoot.Resouces["simpleRenderer"] as SimpleRenderer;
            gl.Renderer = simpleRenderer;            
           
        }.

In your xaml remove the event handlers on the checkbox:
Checked="clusterCheckBox_Checked" and Unchecked="clusterCheckBox_Unchecked".

Hope this works!

Good Luck!