Sandbox::https://github.com/trgiangv/RevitDevTool/blob/develop/samples/CSharpScriptDemo/main

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#r "C:/Program Files/dotnet/packs/Microsoft.NETCore.App.Ref/8.0.27/ref/net8.0/System.Runtime.dll"

// #r "C:/Program Files (x86)/Reference Assemblies/Microsoft/Framework/.NETFramework/v4.8/mscorlib.dll"

#r "C:/Program Files/Autodesk/Revit 2025/RevitAPI.dll"

#r "C:/Program Files/Autodesk/Revit 2025/RevitAPIUI.dll"

#load "./Helpers/DocumentHelper.csx"

using Autodesk.Revit.DB;

using Autodesk.Revit.UI;

using Autodesk.Revit.Attributes;

using System.Diagnostics;

[Transaction(TransactionMode.Manual)]

public class DemoCmd : IExternalCommand

{

public Result Execute(ExternalCommandData commandData, ref string message, ElementSet elements)

{

var uiapp = commandData.Application;

var doc = uiapp.ActiveUIDocument.Document;

DocumentHelper.TraceDocumentStats(doc);

var info = DocumentHelper.GetProjectInfo(doc);

var wallCount = DocumentHelper.CountElements<Wall>(doc);

TaskDialog.Show("C# Script Demo",

$"{info}\n\nWalls: {wallCount}");

var selectedRef = uiapp.ActiveUIDocument.Selection.PickObject(Autodesk.Revit.UI.Selection.ObjectType.Element);

var selectedElement = doc.GetElement(selectedRef);

var bbox = selectedElement.get_BoundingBox(null);

var topCenter = (bbox.Max + new XYZ(bbox.Min.X, bbox.Min.Y, bbox.Max.Z)) / 2;

Trace.Write(bbox);

Trace.Write(topCenter);

Trace.Write(bbox.Max);

return Result.Succeeded;

}