删除面积为1500以下的要素

private void 处理面积ToolStripMenuItem_Click(object sender, EventArgs e)
        {
             pLayer = axMapControl2.get_Layer(0);
             pFLayer = pLayer as IFeatureLayer;
             pFC = pFLayer.FeatureClass;

            IFeatureCursor pFCursor = pFC.Search(null, false);
            IFeature pFeature = pFCursor.NextFeature();


            //创建表，获得要素ID，标识码，面积，用于筛选相同表示码，面积较小的要素
            DataTable pTable = new DataTable();

            DataColumn colID = new DataColumn("要素ID");
            colID.DataType = System.Type.GetType("System.String");
            pTable.Columns.Add(colID);

            DataColumn colIdent = new DataColumn("标识码");
            colIdent.DataType = System.Type.GetType("System.String");
            pTable.Columns.Add(colIdent);

            DataColumn colArea = new DataColumn("面积");
            colArea.DataType = System.Type.GetType("System.Double");
            
            pTable.Columns.Add(colArea);

            int indexOfFID_HBTC_Z = pFC.FindField("FID_HBTC_Z");
            int indexOfBSM = pFC.FindField("BSM");
            int indexOfTBMJ = pFC.FindField("TBMJ");

            while (pFeature != null)
            {
                string FID_HBTC_Z = pFeature.get_Value(indexOfFID_HBTC_Z).ToString();
                string BSM = pFeature.get_Value(indexOfBSM).ToString();
                double TBMJ = (double)pFeature.get_Value(indexOfTBMJ);

                DataRow pRow = pTable.NewRow();
                pRow[0] = FID_HBTC_Z;
                pRow[1] = BSM;
                pRow[2] = TBMJ;
                pTable.Rows.Add(pRow);
                pFeature = pFCursor.NextFeature();
            }

            //从表中获得同一标识码的列表，并删除与当前标识码面积小的要素

            for (int i = 0; i < pTable.Rows.Count; i++)
            {
                string bsm1 = pTable.Rows[i][1].ToString();

                double TBMJ1 = (double)pTable.Rows[i][2];

                for (int x = 0; x < pTable.Rows.Count; x++)
                {
                    string FID_HBTC_Z2 = pTable.Rows[x][0].ToString();
                    string bsm2 = pTable.Rows[x][1].ToString();
                     double TBMJ2 = (double)pTable.Rows[x][2];
                    if (bsm1 == bsm2)
                    {
                        if (TBMJ1 > TBMJ2)
                        {
                            deleteFeature(FID_HBTC_Z2);
                        }
                    }
                }
                

            }


            //dataGridView1.DataSource = pTable;
        }

        
        private void deleteFeature(string FID_HBTC_Z)
        {

            IQueryFilter queryFilter = new QueryFilterClass();
            queryFilter.WhereClause = "FID_HBTC_Z=" + FID_HBTC_Z;


            IFeatureCursor updateCursor = pFC.Update(queryFilter, true);

            IFeature feature1 = updateCursor.NextFeature();

           

            while (feature1 != null)
            {
                updateCursor.DeleteFeature();
                


                feature1 = updateCursor.NextFeature();

            }

            updateCursor.Flush();

            //TokayWorkspace.ComRelease(del_featcur);
            //updateCursor = null;  



            axMapControl2.ActiveView.Refresh();
        }