cad2014 C#二次开发，过滤问题

如何做过滤操作
PromptSelectionResult ProSset = null;
TypedValue[] filList = new TypedValue[1] { new TypedValue((int)DxfCode.LayerName, name) };
SelectionFilter sfilter = new SelectionFilter(filList);

       Editor ed = Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument.Editor;
       ProSset = ed.SelectAll(sfilter);

                ProSset Status为e为Error，Value为null
                求解决方案

https://jingyan.baidu.com/article/5d368d1ea7f0e23f60c057d9.html
录制宏看代码