ArcGIS Engine+C#实例开发教程》第三讲 MapControl与PageLayoutControl同步-ArcObjects开发-技术专栏-GIS空间站

摘要：在ArcMap中，能够很方面地进行MapView和Layout View两种视图的切换，而且二者之间的数据是同步显示的。关于两种视图同步的实现方法有多种，可以使用ObjectCopy对象进行数据硬拷贝，而比较简单的方法莫过于二者共享一份地图了，这也是最常用的方法。

2、新建Maps类

在同步类中，要用到Maps类，用于管理地图对象。与新建同步类ControlsSynchronizer类似，我们新建一Maps类，其所有代码如下所示：

using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;

using ESRI.ArcGIS.Carto;

namespace _sdnMap
{
    [Guid("f27d8789-fbbc-4801-be78-0e3cd8fff9d5")]
    [ClassInterface(ClassInterfaceType.None)]
    [ProgId("_sdnMap.Maps")]
    public class Maps : IMaps, IDisposable
    {
        //class member - using internally an ArrayList to manage the Maps collection
        private ArrayList m_array = null;

        #region class constructor
        public Maps()
        {
            m_array = new ArrayList();
        }
        #endregion

#region IDisposable Members

        /// <summary>
        /// Dispose the collection
        /// </summary>
        public void Dispose()
        {
            if (m_array != null)
            {
                m_array.Clear();
                m_array = null;
            }
        }

#endregion

#region IMaps Members

        /// <summary>
        /// Remove the Map at the given index
        /// </summary>
        /// <param name="Index"></param>
        public void RemoveAt(int Index)
        {
            if (Index > m_array.Count || Index < 0)
                throw new Exception("Maps::RemoveAt:\r\nIndex is out of range!");

m_array.RemoveAt(Index);
}

        /// <summary>
        /// Reset the Maps array
        /// </summary>
        public void Reset()
        {
            m_array.Clear();
        }

        /// <summary>
        /// Get the number of Maps in the collection
        /// </summary>
        public int Count
        {
            get
            {
                return m_array.Count;
            }
        }

        /// <summary>
        /// Return the Map at the given index
        /// </summary>
        /// <param name="Index"></param>
        /// <returns></returns>
        public IMap get_Item(int Index)
        {
            if (Index > m_array.Count || Index < 0)
                throw new Exception("Maps::get_Item:\r\nIndex is out of range!");

return m_array[Index] as IMap;
}

        /// <summary>
        /// Remove the instance of the given Map
        /// </summary>
        /// <param name="Map"></param>
        public void Remove(IMap Map)
        {
            m_array.Remove(Map);
        }

        /// <summary>
        /// Create a new Map, add it to the collection and return it to the caller
        /// </summary>
        /// <returns></returns>
        public IMap Create()
        {
            IMap newMap = new MapClass();
            m_array.Add(newMap);

return newMap;
}

        /// <summary>
        /// Add the given Map to the collection
        /// </summary>
        /// <param name="Map"></param>
        public void Add(IMap Map)
        {
            if (Map == null)
                throw new Exception("Maps::Add:\r\nNew Map is mot initialized!");

m_array.Add(Map);
}

#endregion
}
}

3、新建打开文档类OpenNewMapDocument

由于从工具栏自带的打开按钮打开地图文档的时候，不会自动进行两种视图之间的同步，所以我们要自己派生一个OpenNewMapDocument类，用于打开地图文档。
右击项目名，选择“添加|类”，再选择ArcGIS类别中的BaseCommand模板，输入类名为“OpenNewMapDocument.cs”。
首先添加引用：

using System.Windows.Forms;
using ESRI.ArcGIS.Carto;

再添加如下成员变量：

private ControlsSynchronizer m_controlsSynchronizer = null;

修改默认的构造函数如下所示：

//添加参数
public OpenNewMapDocument(ControlsSynchronizer controlsSynchronizer)
        {
            //
            // TODO: Define values for the public properties
            //
//设定相关属性值
            base.m_category = "Generic"; //localizable text
            base.m_caption = "Open"; //localizable text
            base.m_message = "This should work in ArcMap/MapControl/PageLayoutControl"; //localizable text
            base.m_toolTip = "Open"; //localizable text
            base.m_name = "Generic_Open";   //unique id, non-localizable (e.g. "MyCategory_MyCommand")

   //初始化m_controlsSynchronizer
            m_controlsSynchronizer = controlsSynchronizer;

            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");
            }
        }

再在OnClick函数中添加如下代码：

public override void OnClick()
        {
            // TODO: Add OpenNewMapDocument.OnClick implementation
            OpenFileDialog dlg = new OpenFileDialog();
            dlg.Filter = "Map Documents (*.mxd)|*.mxd";
            dlg.Multiselect = false;
            dlg.Title = "Open Map Document";
            if (dlg.ShowDialog() == DialogResult.OK)
            {
                string docName = dlg.FileName;

                IMapDocument mapDoc = new MapDocumentClass();
                if (mapDoc.get_IsPresent(docName) && !mapDoc.get_IsPasswordProtected(docName))
                {
                    mapDoc.Open(docName, string.Empty);
                    IMap map = mapDoc.get_Map(0);
                    m_controlsSynchronizer.ReplaceMap(map);

                    mapDoc.Close();
                }
            }
        }

在添加类时，模板会自动添加一个名为“OpenNewMapDocument.bmp”的图标，你可以自己修改或者替换为打开的文件夹的图标。

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ArcGIS Engine+C#实例开发教程》第三讲 MapControl与PageLayoutControl同步

Tags：ArcGIS Engine