AE实现对矢量数据的字段值进行最大值、最小值、求和、平均值、方差统计：...

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概述

要求：需要统计的字段必须是数字类型的数据：

主要使用的核心接口有:IDataStatistics和IStaticsResults。类有：BaseStatisticsClass

思路：

由于IStaticsResults中有统计的相关属性(max、min、sum、mean等)，BaseStatisticsClass为实现类，所以需要图层中的某个接口跳到IStaticsResults接口；所以使用IDataStatistics中的Statistics属性；

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using ESRI.ArcGIS.esriSystem;
using ESRI.ArcGIS.Carto;
using ESRI.ArcGIS.Geometry;
using ESRI.ArcGIS.Geodatabase;

namespace staticsgistest
{
    public partial class Form1 : Form
    {
        public Form1()
        {
                                             ESRI.ArcGIS.RuntimeManager.Bind(ESRI.ArcGIS.ProductCode.EngineOrDesktop);
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }
        //min
        private void button1_Click(object sender, EventArgs e)
        {
            IFeatureLayer lyr = axMapControl1.Map.get_Layer(0) as IFeatureLayer;
            IFeatureCursor feacursor = lyr.FeatureClass.Search(null,true);//true表示只读

            IDataStatistics statics = new DataStatisticsClass();
            statics.Cursor = feacursor as ICursor;//传入图层中的属性表的游标
            statics.Field = "cd";
            IStatisticsResults iss = statics.Statistics;
            double count = iss.Minimum;
            MessageBox.Show(count.ToString());
        }
        //max
        private void button2_Click(object sender, EventArgs e)
        {
            IFeatureLayer lyr = axMapControl1.Map.get_Layer(0) as IFeatureLayer;
            IFeatureCursor feacursor = lyr.FeatureClass.Search(null, true);//true表示只读

            IDataStatistics statics = new DataStatisticsClass();
            statics.Cursor = feacursor as ICursor;
            statics.Field = "cd";
            IStatisticsResults iss = statics.Statistics;
            double count = iss.Maximum;
            MessageBox.Show(count.ToString());
        }

        private void button3_Click(object sender, EventArgs e)
        {
            IFeatureLayer lyr = axMapControl1.Map.get_Layer(0) as IFeatureLayer;
            IFeatureCursor feacursor = lyr.FeatureClass.Search(null, true);//true表示只读

            IDataStatistics statics = new DataStatisticsClass();
            statics.Cursor = feacursor as ICursor;
            statics.Field = "cd";
            IStatisticsResults iss = statics.Statistics;
            double count = iss.Sum;
            MessageBox.Show(count.ToString());
        }

        private void button4_Click(object sender, EventArgs e)
        {
            IFeatureLayer lyr = axMapControl1.Map.get_Layer(0) as IFeatureLayer;
            IFeatureCursor feacursor = lyr.FeatureClass.Search(null, true);//true表示只读

            IDataStatistics statics = new DataStatisticsClass();
            statics.Cursor = feacursor as ICursor;
            statics.Field = "cd";
            IStatisticsResults iss = statics.Statistics;
            double count = iss.Count;
            MessageBox.Show(count.ToString());
        }
    }
}