出符合条件的要素集

使用 IFeatureDataConverter2  接口

使用方法ConvertFeatureClass method(),这个方法需要下面的参数

public IEnumInvalidObject ConvertFeatureClass (     IDatasetName inputFClassName,     IQueryFilter InputQueryFilter,     ISelectionSet InputSelectionSet,     IFeatureDatasetName outputFDatasetName,     IFeatureClassName outputFClassName,     IGeometryDef OutputGeometryDef,     IFields OutputFields,     string configKey,     int FlushInterval,     int parentHWND );

public void ConvertData()
        {
            //设置inputselectset
            IFeatureLayer pFeatureLayer = this.axMapControl1.Map.get_Layer(0) as IFeatureLayer;//获取导出的图层
            IFeatureSelection pFeatureSelection = pFeatureLayer as IFeatureSelection;//将当前图层上与要素选择接口关联
            ISelectionSet pSelection = pFeatureSelection.SelectionSet;//获取当前图层上的选择集

            //设置inputFclassname
            IDataset pInDataset = pFeatureLayer.FeatureClass as IDataset;//获取当前图层的FeatureClass所在的数据集
            IDatasetName pInputFClassName = (IDatasetName)pInDataset.FullName;//获取输入的数据集的路径全名

            ///////下面的代码是设置，导出数据的一些属性
            SaveFileDialog sFd = new SaveFileDialog();
            sFd.Title = "保存shp文件";
            sFd.DefaultExt = "shp";
            sFd.Filter = "shp文件(*.shp)|*.shp";
            sFd.ShowDialog();
            string ExportShapeFileName = sFd.FileName;
            string ExportFileShortName = System.IO.Path.GetFileNameWithoutExtension(ExportShapeFileName);//获取导出shapefile的名称
            string ExportFilePath = System.IO.Path.GetDirectoryName(ExportShapeFileName);//获取导出shapefile的路劲

            IWorkspaceFactory pShpWorkspaceFactory = new ShapefileWorkspaceFactoryClass();//创建一个输出shp文件的工作空间工厂，用于管理导出的数据
            IWorkspaceName pOutWorkspaceName = new WorkspaceNameClass();//实例化一个工作空间名称接口的实例对象
            pOutWorkspaceName = pShpWorkspaceFactory.Create(ExportFilePath, ExportFileShortName, null, 0);//根据输入的路径和文件名创建一个工作空间名称对象
            
            
            IFeatureDatasetName pOutFeatureDatasetName = null;//创建一个要素数据集名称对象，设置导出要素的数据集合名称
            IFeatureClassName pOutFeatureClassName = new FeatureClassNameClass();//创建一个要素类名称对象，用于实例化IDatasetName           
            IDatasetName pOutDatasetName;
            pOutDatasetName = (IDatasetName)pOutFeatureClassName;
            pOutDatasetName.Name = ExportFileShortName;//设置导出数据集的名称
            pOutDatasetName.WorkspaceName = pOutWorkspaceName;//设置导出数据集的工作空间的名称       

            IFields pInFields = pFeatureLayer.FeatureClass.Fields;//获取输入图层的要素类的字段集合
            
            //通过IFieldChecker检查字段的合法性，为输出SHP获得字段集合
            IFieldChecker pFieldChecker= new FieldChecker();     
            IEnumFieldError pEnumFieldError = null;//用于获取错误字段的集合
            IFields pOutFields;//用于获取正确字段的集合
            pFieldChecker.Validate(pInFields, out pEnumFieldError, out pOutFields);
           
            IField pGeoField = null;//用于获取，输入图层的几何字段
            for (int iCounter = 0; iCounter < pOutFields.FieldCount; iCounter++) //通过循环查找几何字段
            {
                if (pOutFields.get_Field(iCounter).Type == esriFieldType.esriFieldTypeGeometry)//根据字段类型，判读出几何字段
                {
                    pGeoField = pOutFields.get_Field(iCounter);
                    break;
                }
            }
            //得到几何字段的相关属性
            IGeometryDef pOutGeometryDef= pGeoField.GeometryDef;
            //设置几何字段的空间参考和网格
            IGeometryDefEdit pOutGeometryDefEdit = (IGeometryDefEdit)pOutGeometryDef;
            pOutGeometryDefEdit.GridCount_2 = 1;
            pOutGeometryDefEdit.set_GridSize(0, 1500000);
          
            try
            {
                IFeatureDataConverter2 pFeaDaCon = new FeatureDataConverterClass();
                //带入参数，导出数据
                pFeaDaCon.ConvertFeatureClass(pInputFClassName, null, pSelection, pOutFeatureDatasetName, pOutFeatureClassName, pOutGeometryDef, pOutFields, "", 1000, 0);
                MessageBox.Show("导出成功", "系统提示");
            }
            catch (Exception ex)
            {
                MessageBox.Show("the following exception occurred:" + ex.ToString());
            }
        }