/// <summary>
/// This activates the labels for the specified feature layer that will be the specified expression
/// where field names are in square brackets like "[Name]: [Value]". This will label all the features,
/// and remove any previous labeling.
/// </summary>
/// <param name="featureLayer">The FeatureLayer to apply the labels to.</param>
/// <param name="expression">The string label expression to use where field names are in square brackets like
/// [Name].</param>
/// <param name="font">The font to use for these labels.</param>
/// <param name="fontColor">The color for the labels.</param>
/// <exception cref="ArgumentNullException"><paramref name="featureLayer"/> must be not null.</exception>
public static void AddLabels(this IFeatureLayer featureLayer, string expression, Font font, Color fontColor)
{
if (featureLayer == null)
{
throw new ArgumentNullException(nameof(featureLayer));
}
featureLayer.ShowLabels = true;
var ll = new MapLabelLayer();
ll.Symbology.Categories.Clear();
var lc = new LabelCategory
{
Expression = expression
};
ll.Symbology.Categories.Add(lc);
var ls = ll.Symbolizer;
ls.Orientation = ContentAlignment.MiddleCenter;
ls.FontColor = fontColor;
ls.FontFamily = font.FontFamily.ToString();
ls.FontSize = font.Size;
ls.FontStyle = font.Style;
ls.PartsLabelingMethod = PartLabelingMethod.LabelLargestPart;
featureLayer.LabelLayer = ll;
}
/// <summary>
/// This activates the labels for the specified feature layer that will be the specified expression
/// where field names are in square brackets like "[Name]: [Value]". This will label all the features,
/// and remove any previous labeling.
/// </summary>
/// <param name="featureLayer">The FeatureLayer to apply the labels to.</param>
/// <param name="expression">The string label expression to use where field names are in square brackets like
/// [Name]</param>
/// <param name="font">The font to use for these labels</param>
/// <param name="fontColor">The color for the labels</param>
public static void AddLabels(this IFeatureLayer featureLayer, string expression, Font font, Color fontColor)
{
featureLayer.ShowLabels = true;
var ll = new MapLabelLayer();
ll.Symbology.Categories.Clear();
var lc = new LabelCategory { Expression = expression };
ll.Symbology.Categories.Add(lc);
var ls = ll.Symbolizer;
ls.Orientation = ContentAlignment.MiddleCenter;
ls.FontColor = fontColor;
ls.FontFamily = font.FontFamily.ToString();
ls.FontSize = font.Size;
ls.FontStyle = font.Style;
ls.PartsLabelingMethod = PartLabelingMethod.LabelLargestPart;
featureLayer.LabelLayer = ll;
}
/// <summary>
/// A default method to generate a label layer.
/// </summary>
protected override void OnCreateLabels()
{
LabelLayer = new MapLabelLayer(this);
}
/// <summary>
/// A default method to generate a label layer.
/// </summary>
protected override void OnCreateLabels()
{
LabelLayer = new MapLabelLayer(this);
}