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
     
       FieldList = new List
      
       ();        public void Display(List
       
         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
        
          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
     
       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
      
        cz = new List
       
        ();            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";                }            }        }            }}