ShrlAlgoToolkit/ShrlAlgoToolkit.RevitAddins/RvMEP/FlipWorkplaneCmd.cs

using Autodesk.Revit.Attributes;
using Autodesk.Revit.DB;

using Nice3point.Revit.Toolkit.External;


namespace ShrlAlgoToolkit.RevitAddins.RvMEP
{
    [Transaction(TransactionMode.Manual)]
    public class FlipWorkplaneCmd : ExternalCommand
    {
        public override void Execute()
        {
            try
            {
                ICollection<FamilyInstance> familyInstances;
                if (UiDocument.Selection.GetElementIds().Count > 0)
                {
                    familyInstances = UiDocument.Selection.GetElementIds().Select(Document.GetElement).OfType<FamilyInstance>().ToList();

                }
                else
                {
                    familyInstances = UiDocument.SelectObjects<FamilyInstance>("请选择族实例");
                }
                Document.Invoke(
                    _ =>
                    {
                        foreach (var ins in familyInstances)
                        {
                            if (ins.CanFlipWorkPlane)
                            {
                                ins.IsWorkPlaneFlipped = !ins.IsWorkPlaneFlipped;
                            }
                        }
                    });
            }
            catch (Exception)
            {

            }
        }
    }
}