adding label dynamically in silverlight

LuChen — Fri, 15 May 2015 17:19:56 GMT

Hello everyone,

I am trying to change the sample codes to run time labeling function, which needs to enable labels to show when you click a button

ArcGIS API for Silverlight - Interactive Samples | ArcGIS for Developers ---this is the sample I was trying to modify.

and the result I got from step-by-step debugging looks fine. but I don't see any labels show up to my map

here are my codes:

private void Button_Click(object sender, RoutedEventArgs e)

{

ArcGISDynamicMapServiceLayer DLayer = new ArcGISDynamicMapServiceLayer();

DLayer = (ArcGISDynamicMapServiceLayer)MyMap.Layers["PDLayer"];

DLayer.LayerDrawingOptions = new LayerDrawingOptionsCollection();

LayerDrawingOptions layerdrawingoptions = new LayerDrawingOptions()

{

LayerID = 1,

ShowLabels = true,

ScaleSymbols = true

};

LabelClassCollection labelclasscollection = new LabelClassCollection();

LabelClass labelclass1 = new LabelClass()

{

LabelExpression = "[POP2000]",

LabelPlacement = LabelPlacement.LinePlacementAboveAfter,

Where = "[POP2000] <= 61",

MinScale = 5000,

LabelOptions = new LabelOptions()

{

Color = Colors.Red,

FontFamily = new FontFamily("Arial"),

FontSize = 10,

FontWeight = FontWeights.Bold

}

};

LabelClass labelclass2 = new LabelClass()

{

LabelExpression = "[POP2000]",

LabelPlacement = LabelPlacement.LinePlacementAboveAfter,

Where = "[POP2000] > 61 AND [POP2000] <264",

MinScale = 15000,

LabelOptions = new LabelOptions()

{

Color = Colors.Black,

FontFamily = new FontFamily("Arial"),

FontSize = 10,

FontWeight = FontWeights.Bold

}

};

LabelClass labelclass3 = new LabelClass()

{

LabelExpression = "[POP2000]",

LabelPlacement = LabelPlacement.LinePlacementAboveAfter,

Where = "[POP2000] > 264",

MinScale = 30000,

LabelOptions = new LabelOptions()

{

Color = Colors.Blue,

FontFamily = new FontFamily("Arial"),

FontSize = 14,

FontWeight = FontWeights.Bold

}

};

labelclasscollection.Add(labelclass1);

labelclasscollection.Add(labelclass2); //=labeldrawingoptions.labelclass.add()

labelclasscollection.Add(labelclass3);

layerdrawingoptions.LabelClasses = labelclasscollection;

DLayer.LayerDrawingOptions.Add(layerdrawingoptions);

DLayer.Refresh();

MyMap.UpdateLayout();

}

Re: adding label dynamically in silverlight

saiedaon — Wed, 17 Jun 2015 14:27:00 GMT

try this code

// ShowLayersLabel(true, LayerLabelField);

// true to show label , false to hide labels

// string LayerLabelField = "[Name]";

// ArcGISDynamicMapServiceLayer flayer;

private void ShowLayersLabel(bool p, string LayerLField)

{

DynamicLayerInfoCollection myDynamicLayerInfoCollection = null;

myDynamicLayerInfoCollection = flayer.CreateDynamicLayerInfosFromLayerInfos();

if (myDynamicLayerInfoCollection != null)

{

DynamicLayerInfo myDynamicLayerInfo = myDynamicLayerInfoCollection.FirstOrDefault();

LabelClass ls = new LabelClass();

ls.LabelExpression = LayerLField;

ls.LabelPlacement = LabelPlacement.PolygonPlacementAlwaysHorizontal;

LabelOptions lpo = new LabelOptions()

{

Color = Colors.Red,

FontSize = 10,

FontStyle = TextStyle.Normal,

FontFamily = new System.Windows.Media.FontFamily("Segoe UI Semibold")

};

ls.LabelOptions = lpo;

LabelClassCollection LCollection = new LabelClassCollection();

LCollection.Add(ls);

LayerDrawingOptions myLayerDrawinOptions = null;

myLayerDrawinOptions = new LayerDrawingOptions();

myLayerDrawinOptions.LayerID = myDynamicLayerInfo.ID;

myLayerDrawinOptions.ShowLabels = p;

myLayerDrawinOptions.LabelClasses = LCollection;

LayerDrawingOptionsCollection myLayerDrawingOptionsCollection = null;

myLayerDrawingOptionsCollection = new LayerDrawingOptionsCollection();

myLayerDrawingOptionsCollection.Add(myLayerDrawinOptions);

// Apply the new settings of the Dynamic Layer and refresh the ArcGISDynamicMapServiceLayer.

flayer.LayerDrawingOptions = myLayerDrawingOptionsCollection;

flayer.LayerDrawingOptions[0].ShowLabels = p;

flayer.Refresh();

}

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adding label dynamically in silverlight

Re: adding label dynamically in silverlight