AE CreateFeatureClass 创建shp. 删除shp. 向shp中添加要素

   /// <summary>
        /// 创建多边形shp
        /// </summary>
        /// <param name="pPolygon"></param>
        /// <param name="shpPath"></param>
        public static  void CreatePolygonFeatureClass(IPolygon pPolygon, string shpfolder,string shpname)
        {
            IWorkspaceFactory pWorkSpaceFac = new ShapefileWorkspaceFactoryClass();
            IFeatureWorkspace pFeatureWorkSpace = pWorkSpaceFac.OpenFromFile(shpfolder,0) as IFeatureWorkspace;

            //创建字段集2
            IFeatureClassDescription fcDescription = new FeatureClassDescriptionClass();
            IObjectClassDescription ocDescription = (IObjectClassDescription)fcDescription;//创建必要字段
            IFields fields = ocDescription.RequiredFields;
            int shapeFieldIndex = fields.FindField(fcDescription.ShapeFieldName);
            IField field = fields.get_Field(shapeFieldIndex);
            IGeometryDef geometryDef = field.GeometryDef;
            IGeometryDefEdit geometryDefEdit = (IGeometryDefEdit)geometryDef;
          //geometryDefEdit.GeometryType_2 = esriGeometryType.esriGeometryPoint;
          //geometryDefEdit.SpatialReference_2 = spatialReference;

            geometryDefEdit.GeometryType_2 = esriGeometryType.esriGeometryPolygon;
            ISpatialReferenceFactory pSpatialRefFac = new SpatialReferenceEnvironmentClass();
            IProjectedCoordinateSystem pcsSys = pSpatialRefFac.CreateProjectedCoordinateSystem((int)esriSRProjCS4Type.esriSRProjCS_Xian1980_3_Degree_GK_Zone_39);
            geometryDefEdit.SpatialReference_2 = pcsSys;

            IFieldChecker fieldChecker = new FieldCheckerClass();
            IEnumFieldError enumFieldError = null;
            IFields validatedFields = null; //将传入字段 转成 validatedFields
            fieldChecker.ValidateWorkspace = (IWorkspace)pFeatureWorkSpace;
            fieldChecker.Validate(fields, out enumFieldError, out validatedFields);

            pFeatureWorkSpace.CreateFeatureClass(shpname, validatedFields, ocDescription.InstanceCLSID, ocDescription.ClassExtensionCLSID, esriFeatureType.esriFTSimple, fcDescription.ShapeFieldName, "");
        }

//删除shp

//如果已存在,那么删除
            IFeatureClass pFCChecker = pFeatureWorkSpace.OpenFeatureClass(shpname);
            if (pFCChecker != null)
            {
                IDataset pds = pFCChecker as IDataset;
                pds.Delete();
            }

//向shp中添加要素

        /// <summary>
        /// 向多边形shp中添加要素
        /// </summary>
        /// <param name="pPolygon">多边形</param>
        /// <param name="pFeatureClass">多边形shp</param>
        public static void AddFeatureToFeatureClass(IPolygon pPolygon,IFeatureClass pFeatureClass)
        {
            IFeature pFeature = pFeatureClass.CreateFeature();
            pFeature.Shape = pPolygon;
            pFeature.Store();
        }

//官方例子

  public void IFeatureClass_CreateFeature_Example(IFeatureClass featureClass)
         {
             //Function is designed to work with polyline data
           if (featureClass.ShapeType != ESRI.ArcGIS.Geometry.esriGeometryType.esriGeometryPolyline) { return; }
        //create a geometry for the features shape
             ESRI.ArcGIS.Geometry.IPolyline polyline = new ESRI.ArcGIS.Geometry.PolylineClass();
             ESRI.ArcGIS.Geometry.IPoint point = new ESRI.ArcGIS.Geometry.PointClass();
             point.X = 0; point.Y = 0;
             polyline.FromPoint = point;
             point = new ESRI.ArcGIS.Geometry.PointClass();
             point.X = 10; point.Y = 10;        polyline.ToPoint = point;
             IFeature feature = featureClass.CreateFeature();
        //Apply the constructed shape to the new features shape
             feature.Shape = polyline;
             ISubtypes subtypes = (ISubtypes)featureClass;
             IRowSubtypes rowSubtypes = (IRowSubtypes)feature;
             if (subtypes.HasSubtype)// does the feature class have subtypes?
             {  rowSubtypes.SubtypeCode = 1; //in this example 1 represents the Primary Pipeline subtype
             }
        // initalize any default values that the feature has
                 rowSubtypes.InitDefaultValues();
        //Commit the default values in the feature to the database
                 feature.Store();
        //update the value on a string field that indicates who installed the feature.
                 feature.set_Value(feature.Fields.FindField("InstalledBy"), "K Johnston");
        //Commit the updated values in the feature to the database
                 feature.Store();
             }