从c#读取3DSOLID属性

using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.EditorInput;
using Autodesk.AutoCAD.Runtime;

public class Read3DSolidProperties
{
    [CommandMethod("Read3DSolidAttributes")]
    public void ReadAttributes()
    {
        Document doc = Application.DocumentManager.MdiActiveDocument;
        Database db = doc.Database;
        Editor editor = doc.Editor;

        using (Transaction trans = db.TransactionManager.StartTransaction())
        {
            // 提示用户选择3DSOLID实体
            PromptEntityOptions options = new PromptEntityOptions("Select a 3DSOLID entity:");
            options.SetRejectMessage("Only 3DSOLID entities are allowed.");
            options.AddAllowedClass(typeof(Solid3d), true);

            PromptEntityResult result = editor.GetEntity(options);
            if (result.Status != PromptStatus.OK)
            {
                editor.WriteMessage("No valid 3DSOLID entity selected.");
                return;
            }

            // 打开实体对象并读取属性
            Solid3d solid = trans.GetObject(result.ObjectId, OpenMode.ForRead) as Solid3d;
            if (solid != null)
            {
                // 读取属性
                double volume = solid.Volume;
                Point3d centroid = solid.Centroid;
                double surfaceArea = solid.SurfaceArea;

                // 输出属性值
                editor.WriteMessage("Volume: " + volume.ToString() + "\n");
                editor.WriteMessage("Centroid: " + centroid.ToString() + "\n");
                editor.WriteMessage("Surface Area: " + surfaceArea.ToString() + "\n");
            }
            else
            {
                editor.WriteMessage("Selected entity is not a 3DSOLID.");
            }

            trans.Commit();
        }
    }
}