arcpy面積計算

#coding=utf8
# -*- coding: UTF-8 -*-
import arcpy
from arcpy import env
import os

import sys
###############
##################################

fc= arcpy.GetParameterAsText(0)
fieldname= arcpy.GetParameterAsText(1)


rows = arcpy.da.UpdateCursor(fc,["shape@",fieldname])

i=1
try:
    for
 
 row in rows:

        feat = row[0]
        row[1]=feat.area
        arcpy.AddMessage("No:"+str(i)+":"+str(feat.area))
        rows.updateRow(row)

        i=i+1

    del rows
except Exception as e:
    arcpy.AddError(e.message)

Arcengine C#呼叫arcpy的工具方法

private static bool CalArea(IFeatureClass pFeatureClass, string
 
 FieldName)
        {

            string tbxFileName = @"F:\2020book\原始資料\data\1Python基礎\工具箱.tbx";
            if (!File.Exists(tbxFileName))
            {
                MessageBox.Show("檔案" + tbxFileName + "不存在");
                return false;
            }
            IGeoProcessor gp = new GeoProcessor();
            gp.OverwriteOutput 
 
= true;
            gp.AddOutputsToMap = false;
          

            gp.AddToolbox(tbxFileName);



            // Create a variant - data are in the workspace
            IVariantArray parameters = new VarArray();

            parameters.Add(pFeatureClass);//引數
            parameters.Add(FieldName);//引數
         
            string toolname="計算面積";//工具名稱,建議工具名稱為英文，標籤為中文，


            //object sev = null;

            try
            {
                gp.Execute(toolname, parameters, null);              
            }
            catch (Exception ex)
            {
                MessageBox.Show("錯誤:" + ex.Message + ",\n請自己允許" + tbxFileName + "/" + toolname);
                //string errorMsgs = gp.GetMessages(ref sev);
                //MessageBox.Show(errorMsgs);
                return false;
            }
            finally
            {
                gp = null;
                //MessageBox.Show("ok");
            }
            return true;

        }