使用 ww.cad 完成dwg文件转shp（包含所有属性）

单纯使用ArcEngine提供的接口读取dwg数据转shp存在众多属性无法读取的情况（最直观的 南方cass生产的dwg文件有SOUTH这一字段，为目标要素的类型）

private void ConvertDwgToShp()
        {
            
            DwgReader pDwgReader = new DwgReader(@"D:\app\CAD\test.dwg");

            DxfModel pDxf = pDwgReader.Read();
            DxfEntityCollection xx = pDxf.Entities;

            //为写入shp文件做准备
            WriteDestShpFile wSHP = new WriteDestShpFile();

            //在遍历CAD要素时 筛选唯一图层，创建shp用
            List<string> pLayerList = new List<string>();
            //创建shp文件时，字段集合
            List<string> pDwgFieldList = new List<string>();
            //写入shp时，字段与值 的键值对
            Dictionary<string,string> pDic = new Dictionary<string,string>();

            IWorkspaceFactory pWFactory = new ShapefileWorkspaceFactoryClass();
            IFeatureWorkspace pFWorkspace = pWFactory.OpenFromFile("C:/test",0) as IFeatureWorkspace;


            DelegateTest delegateTest = null;
            foreach (DxfEntity item in xx)
            {
                //当前要素的类型（点线面）
                string GeoType = GetEntityType.GetitemType(item);
                //当前要素将要存入的图层名称
                string DesLayerName = string.Format("{0}_{1}", item.Layer.Name, GeoType);
                
                //扩展属性
                DxfExtendedDataCollection pDxfDataCol = item.ExtendedDataCollection;

                pDic.Clear();
                pDwgFieldList.Clear();


                foreach (DxfExtendedData ExData in pDxfDataCol)
                {
                    //AppID.Name 字段名
                    pDwgFieldList.Add(ExData.AppId.Name);

                    string values = "";
                    for (int j = 0; j < ExData.Values.Count; j++)
                    {
                        values += ExData.Values[j];
                    }
                    pDic.Add(ExData.AppId.Name, values);
                }


                if (!pLayerList.Contains(DesLayerName))
                {
                    pLayerList.Add(DesLayerName);    
　　　　　　　　　　　　//此处为根据要素类类型，名称，字段及路径的一个创建shp文件的方法（需要方法联系,下有联系方式）                
                    CreateDestShpFile.CreateShpFile(GeoType, DesLayerName, pDwgFieldList, "C:/test");
                }

                switch (item.GetType().Name)
                {
                    case "DxfLwPolyline":
                        delegateTest = new DelegateTest((new ConvertDxfLwPolyline()).ConvertToshp);
                        break;
                    case "DxfLwPoint":
                        delegateTest = new DelegateTest((new ConvertDxfPoint()).ConvertToshp);
                        break;
                    case "DxfCircle":
                        delegateTest = new DelegateTest((new ConvertDxfCircle()).ConvertToshp);
                        break;
                    case "DxfPolyline2D":
                        delegateTest = new DelegateTest((new ConvertDxfPolyline2D()).ConvertToshp);
                        break;
                    default:
                        Console.WriteLine(item.GetType().Name);
                        break;
                }
                IGeometry pGeometry = delegateTest.Invoke(item);

                IFeatureClass pFeatureClass = pFWorkspace.OpenFeatureClass(DesLayerName);
                wSHP.WriteDestFeature(pFeatureClass, pGeometry,pDic);
            }
        }

个人理解：CAD中没有面要素与线要素的概念，全部都是线要素，只存在图形封闭与不封闭的区分，因此封闭的时候视为面，下为CAD要素为DxfLwPolyline时的要素转换代码，其它同理。

public  IGeometry ConvertToshp(DxfEntity item)
        {
            //CAD 获取点集合
            DxfLwPolyline pPointColl = item as DxfLwPolyline;

            IGeometry pGeometry = null;
            if (pPointColl.Closed)
            {
                IPointCollection pPoints = new PolygonClass();
                foreach (var point in pPointColl.Vertices)
                {
                    IPoint pPoint = new PointClass() { X = point.X, Y = point.Y };
                    pPoints.AddPoint(pPoint);
                }
                pPoints.AddPoint(pPoints.get_Point(0));
                pGeometry = pPoints as IPolygon;
            }
            else
            {
                IPointCollection pPoints = new PolylineClass();
                foreach (var point in pPointColl.Vertices)
                {
                    IPoint pPoint = new PointClass() { X = point.X, Y = point.Y };
                    pPoints.AddPoint(pPoint);
                }
                pGeometry = pPoints as IPolyline;
            }
            return pGeometry;
        }

使用的是 ww.cad 类库 版本4.0.35.21（单纯复制粘贴不可使用，非关键代码篇幅原因没展示）

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