创建shp文件并把feature添加到该shp文件中

                IFeatureCursor cursor;
                IFeatureBuffer featureBuffer;
                IFeatureClass featureClass;
                featureClass = operateShp.CreateShapefile(path, name, polygon.GeometryType);
                cursor = featureClass.Insert(true);
                featureBuffer = featureClass.CreateFeatureBuffer();
                featureBuffer.Shape = polygon;
                cursor.InsertFeature(featureBuffer);

        /// <summary>
        /// 创建Shapefile文件，返回该文件的IFeatureClass
        /// </summary>
        /// <param name="path"></param>
        /// <param name="fileName"></param>
        /// <returns></returns>
        public  IFeatureClass CreateShapefile(string path, string fileName,esriGeometryType featureType)
        {
            string filePathName = path + fileName;
            if (File.Exists(filePathName))
            {
                MessageBox.Show("文件已经存在!");
                return null;
            }
            IFeatureWorkspace featureWorkspace;
            IWorkspaceFactory workspaceFactory = new ShapefileWorkspaceFactoryClass();
            IField field = new FieldClass();
            IFieldEdit fieldEdit;
            IFields fields = new FieldsClass();
            IFieldsEdit fieldsEdit = (IFieldsEdit)fields;
            IGeometryDef geometryDef = new GeometryDefClass();
            IGeometryDefEdit geometryDefEdit;

            featureWorkspace = (IFeatureWorkspace)workspaceFactory.OpenFromFile(path, 0);
            fieldEdit = (IFieldEdit)field;
            fieldEdit.Name_2 = "shape";
            fieldEdit.Type_2 = esriFieldType.esriFieldTypeGeometry;
            geometryDefEdit = (IGeometryDefEdit)geometryDef;
            //switch (featureType)
            //{
            //    case esriGeometryType.esriGeometryMultipoint:
            //        geometryDefEdit.GeometryType_2 = esriGeometryType.esriGeometryPolyline;
            //        break;
            //    case esriGeometryType.esriGeometryPolyline:
            //        geometryDefEdit.GeometryType_2 = esriGeometryType.esriGeometryPolyline;
            //        break;
            //    case esriGeometryType.esriGeometryPolyline:
            //        geometryDefEdit.GeometryType_2 = esriGeometryType.esriGeometryPolyline;
            //        break;
            //}
            geometryDefEdit.GeometryType_2 = featureType;
            geometryDefEdit.SpatialReference_2 = new UnknownCoordinateSystemClass();
            fieldEdit.GeometryDef_2 = geometryDef;
            fieldsEdit.AddField(field);

            return featureWorkspace.CreateFeatureClass(fileName, fields, null, null, esriFeatureType.esriFTSimple, "shape", "");
        }