arcengine动态显示所需字段值

需求：实现和GIS桌面端中Identify的类似功能，鼠标滑动的时候可以显示鼠标所在位置的要素的指定字段的值.。

主要操作流程：

①先打开一个对话框，用于选择需要显示的图层和字段名

②点击确定之后，在mapControl上鼠标滑动的时候利用axMapControl的showTips功能实现实时显示，相对于Identify，取消的点击查看属性，和只能查看所有属性的弊端。

主窗体代码

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using ESRI.ArcGIS.Carto;
using ESRI.ArcGIS.Controls;

namespace MapChuanzhi
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        public int s_flag = 0;
        private void button2_Click(object sender, EventArgs e)
        {
            IMap pMap = this.axMapControl1.Map;
            Form2 frm2 = new Form2(pMap);
            frm2.formDelegate += new FormDelegate(Display);
            frm2.StartPosition = FormStartPosition.CenterScreen;
            frm2.ShowDialog();
            s_flag = 1;
        }

        string LayerName = "";
        List<string> FieldList = new List<string>();
        public void Display(List<string> lc)
        {
            LayerName = lc[0].ToString();
            FieldList.Clear();
            for (int j = 1; j < lc.Count; j++)
            {
                FieldList.Add(lc[j].ToString());
            }
        }

        private void axMapControl1_OnMouseMove(object sender, ESRI.ArcGIS.Controls.IMapControlEvents2_OnMouseMoveEvent e)
        {
            switch (s_flag)
            {
                case 1:
                    showtips(FieldList, e);
                    break;
                default:
                    break;
            }
        }

        private void showtips(List<string> index, IMapControlEvents2_OnMouseMoveEvent e)
        {
            
            StringBuilder sb = new StringBuilder();
            string headd = string.Format("{0}:{1}", "图层", LayerName);
            sb.AppendLine(headd);
            sb.AppendLine( "————————");
            for (int i = 0; i < this.axMapControl1.Map.LayerCount; i++)
            {
                if (axMapControl1.get_Layer(i).Name.ToString().Equals(LayerName))
                {
                    
                    for (int j = 0; j < index.Count; j++)
                    {

                        IFeatureLayer pFLayer = axMapControl1.Map.get_Layer(i) as IFeatureLayer;
                        pFLayer.DisplayField = index[j].ToString();
                        pFLayer.ShowTips = true;
                        string Text = pFLayer.get_TipText(e.mapX, e.mapY, axMapControl1.ActiveView.FullExtent.Width / 1000);
                        if (string.IsNullOrWhiteSpace(Text))
                        {
                            break;
                        }
                        sb.AppendLine(string.Format("{0}:{1}",index[j].ToString(),Text));
                    }

                    if (sb.Length == headd.Length + "————————".Length + 4)
                        sb.Clear();
                    toolTip1.SetToolTip(axMapControl1, sb.ToString());
                    
                    
                }
            }
        }

        
    }
}

属性窗口代码

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

namespace MapChuanzhi
{
    public delegate void FormDelegate(List<string> FormMessage);
    public partial class Form2 : Form
    {
        private ESRI.ArcGIS.Carto.IMap pMap;
        
        public Form2( ESRI.ArcGIS.Carto.IMap pMap)
        {
            InitializeComponent();
            // TODO: Complete member initialization
            this.pMap = pMap;
        }

        private void Form2_Load(object sender, EventArgs e)
        {
            for (int i = 0; i < pMap.LayerCount; i++)
            {
                this.comboBox1.Items.Add(pMap.get_Layer(i).Name.ToString());
            }
        }
        string selectItems;
        private void comboBox1_SelectedValueChanged(object sender, EventArgs e)
        {
            selectItems=comboBox1.SelectedItem.ToString();
            for (int i = 0; i < pMap.LayerCount; i++)
            {
                if (pMap.get_Layer(i).Name.ToString() == selectItems)
                {
                    IFeatureLayer pFLayer = pMap.get_Layer(i) as IFeatureLayer;
                    IFeatureClass pFClass = pFLayer.FeatureClass;
                    this.checkedListBox1.Items.Clear();
                    for (int j = 0; j < pFClass.Fields.FieldCount; j++)
                    {
                        this.checkedListBox1.Items.Add(pFClass.Fields.get_Field(j).Name);
                    }
                    try
                    {
                        checkedListBox1.Items.Remove("Shape");
                    }
                    catch (Exception)
                    {
                        
                        throw;
                    }
                }
            }
        }

        /***************窗体委托传值*********************/
        public FormDelegate formDelegate;
        private void button1_Click(object sender, EventArgs e)
        {
            if (this.checkedListBox1.CheckedItems == null || this.comboBox1.SelectedItem== null)
                return;
            List<string> cz = new List<string>();
            cz.Add(comboBox1.SelectedItem.ToString());
            for (int i = 0; i < checkedListBox1.CheckedItems.Count; i++)
            {
                cz.Add(checkedListBox1.CheckedItems[i].ToString());
            }
            try
            {
                cz.Remove("Shape");
            }
            catch
            { 
                
            }
            formDelegate(cz);
            this.Dispose();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            if (this.button2.Text == "全选")
            {
                for (int i = 0; i < this.checkedListBox1.Items.Count; i++)
                {
                    this.checkedListBox1.SetItemChecked(i, true);
                    this.button2.Text = "取消全选";
                }
            }
            else
            {
                for (int i = 0; i < this.checkedListBox1.Items.Count; i++)
                {
                    this.checkedListBox1.SetItemChecked(i, false);
                    this.button2.Text = "全选";
                }
            }
        }
        


    }
}