添加项目文件。

Sai.RvKits/Converters/RvConverters.cs

@@ -0,0 +1,31 @@
+using System;
+
+using Autodesk.Revit.DB;
+
+namespace Sai.RvKits.Converters;
+
+public static class RvConverters
+{
+	public static Element ToElement(this ElementId elementId, Document doc)
+	{
+		return doc.GetElement(elementId);
+	}
+
+	public static Category ToCategory(this BuiltInCategory builtInCategory, Document doc)
+	{
+		return Category.GetCategory(doc, builtInCategory);
+	}
+
+	public static BuiltInCategory ToBuiltInCategory(this Category category)
+	{
+#if REVIT2018 || REVIT2020
+        var builtInCategory = (BuiltInCategory)category.Id.IntegerValue;
+#elif REVIT2025
+        var builtInCategory = (BuiltInCategory)category.Id.Value;
+#endif
+
+        return Enum.IsDefined(typeof(BuiltInCategory), builtInCategory)
+			? builtInCategory
+			: throw new ArgumentNullException(nameof(category), "不存在该内建类别");
+	}
+}