导出选择要素成矢量文件

        private void btnExportSelect_Click(object sender, EventArgs e)
        {
            FolderBrowserDialog ExportShapeFile = new FolderBrowserDialog();
            ExportShapeFile.Description="选择保存路径";
            if (ExportShapeFile.ShowDialog() == DialogResult.OK)
            {
                string Diretory = ExportShapeFile.SelectedPath;
                this.Cursor = System.Windows.Forms.Cursors.WaitCursor;
                for (int i = 0; i < axMapControl1.LayerCount; i++)
                    ExportShapefile(Diretory, axMapControl1.get_Layer(i));
                this.Cursor = System.Windows.Forms.Cursors.Default;
                MessageBox.Show("导出完成！", "提示");
            }
        }
      //导出选择要素
        public void ExportShapefile(string ShapeFileFolder, ILayer pLayer)
        {
               try
              {
                IFeatureLayer Featurelayer = pLayer as IFeatureLayer;
                if (Featurelayer == null)
                {
                    return;
                }
                IFeatureSelection pFeatureSelection = Featurelayer as IFeatureSelection;
                ISelectionSet SelectionSet = pFeatureSelection.SelectionSet;
                if (SelectionSet.Count < 1) return;
                IFeatureClass FeatureClass = Featurelayer.FeatureClass;
                if (FeatureClass == null) return;
                IFields pFields = FeatureClass.Fields;