AE开发之主窗体通过Base Comand和IHookHelper接口向子窗体转递图层信息方法模板

主题描述

通过菜单的方法启动新的窗体并向新的窗体传递图层信息，然后在新的窗体中对图层进行其他操作和分析。

基本思路

1.通过点击菜单，通过建立的Base Command工具实现启动先的窗体，前几篇符号系统处理中有详细介绍即代码介绍

主窗体中新建菜单，菜单点击事件下添加代码调用Base Command命令启动窗体：

           ICommand command = new 主窗体.子窗体Cmd();
            command.OnCreate(m_mapControl.Object);
            command.OnClick();

2.通过IHookHelper接口传递参数

using System;
using System.Drawing;
using System.Runtime.InteropServices;
using ESRI.ArcGIS.ADF.BaseClasses;
using ESRI.ArcGIS.ADF.CATIDs;
using ESRI.ArcGIS.Controls;
using ESRI.ArcGIS.Carto;

namespace Farm.统计分析
{
    /// <summary>
    /// Command that works in ArcMap/Map/PageLayout
    /// </summary>
    [Guid("1db569c4-e9c4-4dec-82d9-3c65531b1ef0")]
    [ClassInterface(ClassInterfaceType.None)]
    [ProgId("Farm.统计分析.StatisticsChartCmd")]
    public sealed class StatisticsChartCmd : BaseCommand
    {
        #region COM Registration Function(s)
        [ComRegisterFunction()]
        [ComVisible(false)]
        static void RegisterFunction(Type registerType)
        {
            // Required for ArcGIS Component Category Registrar support
            ArcGISCategoryRegistration(registerType);

            //
            // TODO: Add any COM registration code here
            //
        }

        [ComUnregisterFunction()]
        [ComVisible(false)]
        static void UnregisterFunction(Type registerType)
        {
            // Required for ArcGIS Component Category Registrar support
            ArcGISCategoryUnregistration(registerType);

            //
            // TODO: Add any COM unregistration code here
            //
        }

        #region ArcGIS Component Category Registrar generated code
        /// <summary>
        /// Required method for ArcGIS Component Category registration -
        /// Do not modify the contents of this method with the code editor.
        /// </summary>
        private static void ArcGISCategoryRegistration(Type registerType)
        {
            string regKey = string.Format("HKEY_CLASSES_ROOT\\CLSID\\{{{0}}}", registerType.GUID);
            MxCommands.Register(regKey);
            ControlsCommands.Register(regKey);
        }
        /// <summary>
        /// Required method for ArcGIS Component Category unregistration -
        /// Do not modify the contents of this method with the code editor.
        /// </summary>
        private static void ArcGISCategoryUnregistration(Type registerType)
        {
            string regKey = string.Format("HKEY_CLASSES_ROOT\\CLSID\\{{{0}}}", registerType.GUID);
            MxCommands.Unregister(regKey);
            ControlsCommands.Unregister(regKey);
        }

        #endregion
        #endregion

        private IHookHelper m_hookHelper = null;
        IMapControl3 m_mapcontrol = null;
        IFeatureLayer currentLayer = null;

        public StatisticsChartCmd()
        {
            //
            // TODO: Define values for the public properties
            //
            base.m_category = ""; //localizable text
            base.m_caption = "";  //localizable text 
            base.m_message = "This should work in ArcMap/MapControl/PageLayoutControl";  //localizable text
            base.m_toolTip = "";  //localizable text
            base.m_name = "";   //unique id, non-localizable (e.g. "MyCategory_MyCommand")

            try
            {
                //
                // TODO: change bitmap name if necessary
                //
                string bitmapResourceName = GetType().Name + ".bmp";
                base.m_bitmap = new Bitmap(GetType(), bitmapResourceName);
            }
            catch (Exception ex)
            {
                System.Diagnostics.Trace.WriteLine(ex.Message, "Invalid Bitmap");
            }
        }

        #region Overridden Class Methods

        /// <summary>
        /// Occurs when this command is created
        /// </summary>
        /// <param name="hook">Instance of the application</param>
        public override void OnCreate(object hook)
        {
            if (hook == null)
                return;

            try
            {
                m_hookHelper = new HookHelperClass();
                m_hookHelper.Hook = hook;
                if (m_hookHelper.ActiveView == null)
                    m_hookHelper = null;
            }
            catch
            {
                m_hookHelper = null;
            }

            if (m_hookHelper == null)
                base.m_enabled = false;
            else
                base.m_enabled = true;

            // TODO:  Add other initialization code
        }

        /// <summary>
        /// Occurs when this command is clicked
        /// </summary>
        public override void OnClick()
        {
            // TODO: Add ExportMapCmd.OnClick implementation
            // TODO: Add ExportMapCmd.OnClick implementation
            if (m_hookHelper == null) return;
            if (m_hookHelper.FocusMap.LayerCount > 0)
            {
                StatisticsChartFrm StatisticsChartfrm = new StatisticsChartFrm(m_hookHelper);
                StatisticsChartfrm.Show(m_hookHelper as System.Windows.Forms.IWin32Window);
            }
            // TODO: Add StatisticsChartCmd.OnClick implementation
        }

        #endregion
    }
}

新窗体获取图层列表

代码如下：

using ESRI.ArcGIS.Carto;
using ESRI.ArcGIS.Controls;
using ESRI.ArcGIS.esriSystem;
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;

namespace Farm.统计分析
{
    public partial class StatisticsChartFrm : Form
    {
        IHookHelper m_hookHelper = null;
        IActiveView m_activeView = null;
        IMap m_map = null;

        const string m_dataSetName = "m_layerDataSet";
        const string m_dataSourceName = "GeoDataSource";
        IFeatureLayer currentLayer = null;
        DataSet m_layerDataSet = new DataSet(m_dataSetName);


        public StatisticsChartFrm(IHookHelper hookHelper)
        {
            InitializeComponent();
            if (hookHelper == null) return;
            m_hookHelper = hookHelper;
            m_activeView = m_hookHelper.ActiveView;
            m_map = m_hookHelper.FocusMap;
        }

        private void StatisticsChartFrm_Load(object sender, EventArgs e)
        {
            initialize();
        }


        private void initialize()
        {
            if (GetLayers() == null) return;
            IEnumLayer layers = GetLayers();
            layers.Reset();
            ILayer layer = layers.Next();
            while (layer != null)
            {
                if (layer is IFeatureLayer)
                {
                    LayerListCob.Items.Add(layer.Name);
                }
                layer = layers.Next();
            }

        }

        #region "GetLayers"
        private IEnumLayer GetLayers()
        {
            UID uid = new UIDClass();
            uid.Value = "{40A9E885-5533-11d0-98BE-00805F7CED21}";// IFeatureLayer
            //uid.Value = "{E156D7E5-22AF-11D3-9F99-00C04F6BC78E}";  // IGeoFeatureLayer
            //uid.Value = "{6CA416B1-E160-11D2-9F4E-00C04F6BC78E}";  // IDataLayer
            if (m_map.LayerCount != 0)
            {
                IEnumLayer layers = m_map.get_Layers(uid, true);
                return layers;
            }
            return null;
        }
        #endregion

    }
}

结果显示：