public ElementCollection GroupByCategory()
{
// Fill a dictionary by elements categories
Dictionary <string, ElementCollection> categoryDict = new Dictionary <string, ElementCollection>();
foreach (ElementContainer elemCont in Rvt.Data.PickedElements)
{
if (categoryDict.Keys.Contains(elemCont.CategoryName) == false)
{
categoryDict.Add(elemCont.CategoryName, new ElementCollection());
}
categoryDict[elemCont.CategoryName].Add(elemCont);
}
// Create a new element collection filled by the dictionary order
ElementCollection groupedCol = new ElementCollection();
foreach (var pair in categoryDict)
{
groupedCol.Add(new ElementContainer(pair.Key)); // Add category line
groupedCol.AddElementCollection(pair.Value); // Add elements of category
}
return(groupedCol);
}
