diff --git a/src/CAD/IFox.CAD.Shared/ExtensionMethod/ObjectIdEx.cs b/src/CAD/IFox.CAD.Shared/ExtensionMethod/ObjectIdEx.cs
index f5ebcb665ca07a919d834d1d115c9d47a369b397..2e74dd244b6643d9b33d9fae1eb80db18d1c7a75 100644
--- a/src/CAD/IFox.CAD.Shared/ExtensionMethod/ObjectIdEx.cs
+++ b/src/CAD/IFox.CAD.Shared/ExtensionMethod/ObjectIdEx.cs
@@ -1,4 +1,5 @@
 using System.Data.Common;
+using System.Text.RegularExpressions;
 
 namespace IFoxCAD.Cad;
 
@@ -50,14 +51,41 @@ public static T GetObject<T>(this ObjectId id,
     /// </summary>
     /// <typeparam name="T">对象类型</typeparam>
     /// <param name="ids">对象id集合</param>
+    /// <param name="exactMatch">精确匹配</param>
     /// <returns>对象id集合</returns>
-    public static IEnumerable<ObjectId> OfType<T>(this IEnumerable<ObjectId> ids) where T : DBObject
+    public static IEnumerable<ObjectId> OfType<T>(this IEnumerable<ObjectId> ids,bool exactMatch =false) where T : DBObject
     {
-        string dxfName = RXClass.GetClass(typeof(T)).DxfName;
-        return ids.Where(id => id.ObjectClass.DxfName == dxfName);
+        var  rxc = RXClass.GetClass(typeof(T));
+        if (exactMatch)
+        {
+            var dxfName = rxc.DxfName;
+            return ids.Where(id => id.ObjectClass.DxfName == dxfName);
+        }
+        else
+        {
+            return ids.Where(id => id.ObjectClass.IsDerivedFrom(rxc));
+        }
     }
     #endregion GetObject
 
+    /// <summary>
+    /// 根据对象句柄字符串获取对象Id
+    /// </summary>
+    /// <param name="db">数据库</param>
+    /// <param name="handleString">句柄字符串</param>
+    /// <returns>对象的ObjectId</returns>
+    public static ObjectId GetObjectId(this Database db, string handleString)
+    {
+        if (long.TryParse(handleString, System.Globalization.NumberStyles.HexNumber, null, out long l))
+        {
+            var hanle = new Handle(l);
+            if (db.TryGetObjectId(hanle, out ObjectId id))
+            {
+                return id;
+            }
+        }
+        return ObjectId.Null;
+    }
 
     /// <summary>
     /// id是否有效,未被删除
diff --git a/src/CAD/IFox.CAD.Shared/ExtensionMethod/PointEx.cs b/src/CAD/IFox.CAD.Shared/ExtensionMethod/PointEx.cs
index 2cfa8d2f43f04da02676f071f7da0ed58d4675aa..e05963341666303e10b3684500b9477ada78ca14 100644
--- a/src/CAD/IFox.CAD.Shared/ExtensionMethod/PointEx.cs
+++ b/src/CAD/IFox.CAD.Shared/ExtensionMethod/PointEx.cs
@@ -56,12 +56,21 @@ public static double GetAngle(this Point2d startPoint, Point2d endPoint)
     /// <param name="a"></param>
     /// <param name="b"></param>
     /// <returns></returns>
-    public static Point2d GetCenter(this Point2d a, Point2d b)
+    public static Point2d GetMidPointTo(this Point2d a, Point2d b)
     {
         // (p1 + p2) / 2; // 溢出风险
         return new Point2d(a.X * 0.5 + b.X * 0.5,
                            a.Y * 0.5 + b.Y * 0.5);
     }
+    /// <summary>
+    /// Z值归零
+    /// </summary>
+    /// <param name="point">点</param>
+    /// <returns>新点</returns>
+    internal static Point3d Z20(this Point3d point)
+    {
+        return new Point3d(point.X, point.Y, 0);
+    }
 
     /// http://www.lee-mac.com/bulgeconversion.html
     /// <summary>
diff --git "a/src/CAD/IFox.CAD.Shared/ExtensionMethod/\346\226\260\345\273\272\345\241\253\345\205\205/HatchConverter.cs" "b/src/CAD/IFox.CAD.Shared/ExtensionMethod/\346\226\260\345\273\272\345\241\253\345\205\205/HatchConverter.cs"
index 34a16046d5a068fd14d59cdf62401c68a80a1974..688bf78aeaf8edc2e8354bc2aeebcba47c40b441 100644
--- "a/src/CAD/IFox.CAD.Shared/ExtensionMethod/\346\226\260\345\273\272\345\241\253\345\205\205/HatchConverter.cs"
+++ "b/src/CAD/IFox.CAD.Shared/ExtensionMethod/\346\226\260\345\273\272\345\241\253\345\205\205/HatchConverter.cs"
@@ -25,7 +25,7 @@ class CircleData
         /// <param name="symmetryAxisPoint2">对称点2</param>
         public CircleData(PointV symmetryAxisPoint1, PointV symmetryAxisPoint2)
         {
-            Center = symmetryAxisPoint1.GetCenter(symmetryAxisPoint2);
+            Center = PointEx.GetMidPointTo(symmetryAxisPoint1, symmetryAxisPoint2);
             Radius = symmetryAxisPoint1.GetDistanceTo(symmetryAxisPoint2) * 0.5;
         }
     }