How to get parameters of a selected Category

demyst

New member
Joined
May 1, 2021
Messages
1
Programming Experience
Beginner
Hi. Working with Revit API. Selected category is in the variable called "category". How to make a list of parameters that belong to that category and put it inside of a new ComboBox?

Assuming that I am going to need to continue inside of the Class.cs file. Should I create a list of all elements (in Class.cs) inside of that selected category and using foreach get the parameters of every single element (all types of parameters) to later create a collection out of them and finally put it in a new ComboBox?

category a.png





Class.cs:
 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 using Autodesk.Revit.DB;
 using Autodesk.Revit.UI;
 using Autodesk.Revit.Attributes;
 using Autodesk.Revit.UI.Selection;
    
 namespace CombineParameters
 {
     [Transaction(TransactionMode.Manual)]
     [RegenerationAttribute(RegenerationOption.Manual)]
    
     public class Class : IExternalCommand
     {
    
         public Result Execute(ExternalCommandData commandData,
                               ref string message,
                               ElementSet elements)
    
         {
             UIApplication uiapp = commandData.Application;
             UIDocument uidoc = uiapp.ActiveUIDocument;
             Document doc = uidoc.Document;
             Settings documentSettings = doc.Settings;
             Categories categories = documentSettings.Categories;
    
             SortedList<string, Category> myCategories = new SortedList<string, Category>();
    
             foreach (Category c in categories)
             {
                 myCategories.Add(c.Name, c);
             }
    
             myCategories.Clear();
    
             foreach (Category c in categories)
             {
                 if (c.AllowsBoundParameters)
                 myCategories.Add(c.Name, c);
             }
             UserWindow UserWindow = new UserWindow(myCategories);
             UserWindow.Show();
    
                
             ElementCategoryFilter filter = new ElementCategoryFilter(category);
             FilteredElementCollector collector = new FilteredElementCollector(doc);
             IList<Element> ListOfParameters = collector.WherePasses(filter);
             //this one doesn't work either
             //IList<Element> ListOfParameters = ListOfParameters.OfClass(typeof(category))
             return Result.Succeeded;
         }
     }
 }


UserWindow.xaml.cs:
 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 using System.Windows;
 using System.Windows.Controls;
 using System.Windows.Data;
 using System.Windows.Documents;
 using System.Windows.Input;
 using System.Windows.Media;
 using System.Windows.Media.Imaging;
 using System.Windows.Navigation;
 using System.Windows.Shapes;
 using Autodesk.Revit.DB;
    
 namespace CombineParameters
    
 {
     /// <summary>
     /// Interaction logic for UserWindRoom.xaml
     /// </summary>
     public partial class UserWindow : Window
     {
         SortedList<string, Category> myCategories;
    
         public UserWindow(SortedList<string, Category> elements)
         {
             InitializeComponent();
    
             AllTheCategories.ItemsSource = elements;
             AllTheCategories.DisplayMemberPath = "Key";
             AllTheCategories.SelectionChanged += OnSelectionChanged;
         }
         public void OnSelectionChanged(object sender, SelectionChangedEventArgs e)
         {
             if (AllTheCategories.SelectedItem is null)
             {
             }
             else if (AllTheCategories.SelectedItem is KeyValuePair<string, object> keyValuePair)
             {
                 var category = (Category)keyValuePair.Value;
             }
         }
     }
 }
 

Skydiver

Staff member
Joined
Apr 6, 2019
Messages
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Location
Chesapeake, VA
Programming Experience
10+
Moving to WPF...
 

Skydiver

Staff member
Joined
Apr 6, 2019
Messages
2,994
Location
Chesapeake, VA
Programming Experience
10+
On line 48-50, you have this:
C#:
ElementCategoryFilter filter = new ElementCategoryFilter(category);
FilteredElementCollector collector = new FilteredElementCollector(doc);
IList<Element> ListOfParameters = collector.WherePasses(filter);

Where is category declared? Where is it initialized?
What is that method WherePasses()? What does it do?
 
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