過去バージョン

• Revit API (C#) で要素のカテゴリとマテリアルを取得
• カテゴリ: element.Category.Name
• マテリアル: element.GetMaterialIds(false) で ID 取得 → doc.GetElement(id) で実体
• 要素タイプによってマテリアル取得方法が違うので分岐が必要なケースあり

using System;
using Autodesk.Revit;
using Autodesk.Revit.DB;
using Autodesk.Revit.UI.Selection;
using Autodesk.Revit.UI;
using Autodesk.Revit.Attributes;
using System.Collections.Generic;

namespace TestTool
{
    [Autodesk.Revit.Attributes.Transaction(Autodesk.Revit.Attributes.TransactionMode.Manual)]
    public class TestTool : IExternalCommand
    {
        public Autodesk.Revit.UI.Result Execute(ExternalCommandData commandData,
            ref string message, ElementSet elements)
        {
            UIDocument uidoc = commandData.Application.ActiveUIDocument;
            Document doc = uidoc.Document;

            Element selectedElement = null;
            foreach (ElementId id in uidoc.Selection.GetElementIds())
            {
                selectedElement = doc.GetElement(id);
                break;  // just get one selected element
            }

            // Get the category instance from the Category property
            Category category = selectedElement.Category;

            BuiltInCategory builtInCategory = (BuiltInCategory)category.Id.IntegerValue;

            String info = "builtInCategory.ToString(): " + builtInCategory.ToString() + "\r\n";
            info += "category.Id: " + category.Id + "\r\n";
            info += "category.Name: " + category.Name + "\r\n";
            info += "category.Material.Id: " + category.Material.Id + "\r\n";
            info += "category.Material.Name: " + category.Material.Name + "\r\n";
            TaskDialog.Show("Revit", info);
            return Autodesk.Revit.UI.Result.Succeeded;
        }
    }
}