C# AutoCAD NetApi xclip 删除 边界

不说了，直接上代码，参照kean的博客吗，这是添加边界的代码 https://www.keanw.com/2012/10/querying-for-xclip-information-inside-autocad-using-net.html

using Autodesk.AutoCAD.ApplicationServices.Core;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.DatabaseServices.Filters;
using Autodesk.AutoCAD.EditorInput;
using Autodesk.AutoCAD.Runtime;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ClassLibrary1
{
    public class Class1
    {
        const string filterDictName = "ACAD_FILTER";
        const string spatialName = "SPATIAL";
        [CommandMethod("DXC")]
        static public void DetectXClip()
        {
            var doc = Application.DocumentManager.MdiActiveDocument;
            var ed = doc.Editor;
            // Ask for an xclipped xref to be selected
            var peo =new PromptEntityOptions( "\nSelect xclipped block or xref" );
            peo.SetRejectMessage("Must be a block or xref.");
            peo.AddAllowedClass(typeof(BlockReference), false);
            var per = ed.GetEntity(peo);
            if (per.Status != PromptStatus.OK)return;
            var tr = doc.TransactionManager.StartTransaction();
            using (tr)
            {
                // Open the selected BlockReference
                var br =  tr.GetObject(per.ObjectId, OpenMode.ForRead) as BlockReference;
                // To save multiple codepaths with the same message
                // ("No clipping information found"), we'll use a flag to
                // see whether we've found anything
                // It should always be a block reference, but it might
                // not have an extension dictionary
                if ( br != null && br.ExtensionDictionary != ObjectId.Null)
                {
                    // The extension dictionary needs to contain a nested
                    // dictionary called ACAD_FILTER
                    var extdict =tr.GetObject(br.ExtensionDictionary, OpenMode.ForRead) as DBDictionary;
                    if (extdict != null && extdict.Contains(filterDictName))
                    {
                        var fildict =tr.GetObject(extdict.GetAt(filterDictName), OpenMode.ForWrite ) as DBDictionary;
                        if (fildict != null) fildict.Erase();
                    }
                }
                tr.Commit();
                doc.Editor.Regen();
            }

        }

    }
}

执行前

执行后,相当于执行命令， xclip，选择外部参照，delete