/// <summary>
/// Removes categories without any features.
/// </summary>
public static void RemoveUnusedCategories(this IFeatureSet fs)
{
var dct = fs.GetCategoryCounts();
var list = new List <IFeatureCategory>();
foreach (var ct in fs.Categories)
{
if (!dct.ContainsKey(ct.Index))
{
list.Add(ct);
}
}
if (list.Any())
{
foreach (var ct in list)
{
fs.Categories.Remove(ct);
}
// need to reapply since it's likely that indices have changed
fs.Categories.ApplyExpressions();
}
}
/// <summary>
/// Calculates the number of shapes in each category
/// </summary>
private void RefreshCategoriesCount()
{
_shapefile.Categories.ApplyExpressions();
var values = _shapefile.GetCategoryCounts(); // id of category, count
int count = _shapefile.Categories.Count;
for (int i = 0; i < count; i++)
{
dgvCategories[CMN_COUNT, i].Value = values.ContainsKey(i) ? values[i] : 0;
}
}