添加项目文件。

Mstn.Toolkit/Helpers/NamedGroupHelper.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+
+using Bentley.DgnPlatformNET;
+using Bentley.DgnPlatformNET.Elements;
+using Bentley.GeometryNET;
+using Bentley.MstnPlatformNET;
+
+namespace Mstn.Toolkit.Helpers
+{
+    public class NamedGroupHelper
+    {
+        /// <summary>
+        /// 删除命名组
+        /// </summary>
+        /// <param name="groupName"></param>
+        /// <returns></returns>
+        public static NamedGroupStatus DeleteNamedGroup(string groupName)
+        {
+            var dgnModelRef = Session.Instance.GetActiveDgnModelRef();
+            NamedGroupCollection groups = new(dgnModelRef);//获得模型中的NamedGroup集
+            NamedGroup group = groups.FindByName(groupName);//根据名称获取对应的NamedGroup
+            if (group != null)//判断是否成功获得指定NamedGroup
+            {
+                return group.DeleteFromFile();//将指定NamedGroup删除
+            }
+            return NamedGroupStatus.NotFound;
+        }
+    }
+}