topic Trouble creating a featurelayer programatically in ArcGIS API for Silverlight Questions

Trouble creating a featurelayer programatically

CraigPatterson — Thu, 10 May 2012 11:54:21 GMT

Trouble Instantiating a FeatureLayer Programatically

I'm trying to create a featurelayer programatically. Unfortunately, it doesn't seem to get instantiated. I have built a usercontrol and in it's constructor, I create the object like this.

            private FeatureLayer securityFeatureLayer;

            public SecurityControl()
            {
                InitializeComponent();

                securityFeatureLayer = new FeatureLayer()
                {
                    Url = "http://xxxxxxxxx/FeatureServer/1",
                    AutoSave = false,
                    Where="1=1"

                };

                securityFeatureLayer.UpdateCompleted += securityFeatureLayer_UpdateCompleted;

                securityFeatureLayer.Update();

            }

The UpdateCompleted handler then attempts to set a feature data grid GraphicsLayer to the feature layer.

            private void securityFeatureLayer_UpdateCompleted(object sender, EventArgs e)
            {

                SecurityFeatureDataGrid.GraphicsLayer = securityFeatureLayer;

            }

    When I debug it, it never reaches the handler so it seems like I'm missing a step.

    Any help is greatly appreciated.

    Craig

Re: Trouble creating a featurelayer programatically

DarinaTchountcheva — Sun, 12 Dec 2021 04:25:12 GMT

Craig,

I had similar problem a few years ago, and I think that you have to call the Update method after the feature layer has been initialized.
So, try this:

public SecurityControl()
            {
                InitializeComponent();

                securityFeatureLayer = new FeatureLayer()
                {
                    Url = "http://xxxxxxxxx/FeatureServer/1",
                    AutoSave = false,
                    Where="1=1"

                };

                securityFeatureLayer.UpdateCompleted += securityFeatureLayer_UpdateCompleted;
                securityFeatureLayer.Initialized += securityFeatureLayer_Initialized;
                

            }

            private void securityFeatureLayer_Initialized(object sender, EventArgs args)
            {               
                securityFeatureLayer.Update();
            }

Good Luck!

Re: Trouble creating a featurelayer programatically

JenniferNery — Thu, 10 May 2012 16:32:38 GMT

If your layer is added to your map control, it is initialized when map is initialized. Otherwise, you need to be explicit and call layer.Initialize() and only until then can you call layer.Update(). This seems related (post# 16) forums.arcgis.com/threads/21714-Editing-Tables-in-Feature-Service-with-Silverlight-4