建议引入Linq2Cad中的部分方法（OfType、Element、SaveData、GetData）

以下是 Linq2Cad 的一些典型用法，

```
        [CommandMethod("testLinq2cad")]
        public static void testLinq2cad()
        {
            using (var db = AcadDatabase.Active())
            {
                //1、便捷的图元过滤机制OfType
                var lines = db.CurrentSpace.Where(p => p.Layer == "0").OfType<Line>().UpgradeOpen();

//2、图层样式等便捷操作
                var layerToIgnore = db.Layers.Element("0");
                foreach (var layer in db.Layers.Except(layerToIgnore).UpgradeOpen())
                {
                    layer.IsOff = true;
                }
                db.Layers.Element("0").AddRange(lines);//图层直接纳入图元

//3、便捷的跨图导入操作Import
                var filePath = "C:\\001.DWG";
                var Name = "AA";
                using (var sourceDb = AcadDatabase.OpenReadOnly(filePath))
                using (var targetDb = AcadDatabase.Active())
                {
                    var block = sourceDb.Blocks.Element(Name);
                    targetDb.Blocks.Import(block);

var Lay = sourceDb.Layers.Element(Name);
                    targetDb.Layers.Import(Lay);

var Linetype = sourceDb.Linetypes.Element(Name);
                    targetDb.Linetypes.Import(Linetype);

var DimStyle = sourceDb.Styles.DimStyles.Element(Name);
                    targetDb.Styles.DimStyles.Import(DimStyle);
                    //.......其余还有MLeaderStyles、TextStyles、MlineStyles等的导入.....

//4、便捷的编组操作
                    //List<Line> lines2 = new List<Line>() ;
                    //Group group2 = db.Groups.CreateOrFind("Group2");

//group2.Append(lines2.Select(line => line.ObjectId));   // append using objectIds
                    //group2.Remove(lines2.Select(line => line.ObjectId));   // remove at using objectIds

// 5、便捷的扩展数据操作
                    Line ln = new Line();
                    ln.SaveData("key", "value");
                    var v = ln.GetData<string>("key");

}
            }
        }
```

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总结：能否参考新增 OfType、Element、SaveData、GetData 等方法？
![输入图片说明](https://foruda.gitee.com/images/1684313516432705675/d4ffeafc_2301703.png "65124.png")

InspireFunction/IFoxCAD

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