三种方法加载MXD文档 （LoadMxFile方法和IMapDocument方法和IMapDocument方法）

LoadMxFile方法加载MXD文档：
 private void loadMxFile方法ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            //加载数据前如果有数据则清空
            try
            {
                OpenFileDialog pOpenFileDialog = new OpenFileDialog();//打开文件
                pOpenFileDialog.CheckFileExists = true;//判断文件存在
                pOpenFileDialog.Title = "打开地图文档";
                pOpenFileDialog.Filter = "ArcMap文档(*.mxd)|*.mxd;|ArcMap模板(*.mxt)|*.mxt|发布地图文件(*.pmf)|*.pmf|所有地图格式(*.mxd;*.mxt;*.pmf)|*.mxd;*.mxt;*.pmf";
                pOpenFileDialog.Multiselect = false;   //不允许多个文件同时选择
                pOpenFileDialog.RestoreDirectory = true;   //存储打开的文件路径
                if (pOpenFileDialog.ShowDialog() == DialogResult.OK)
                {
                    string pFileName = pOpenFileDialog.FileName;
                    if (pFileName == "")
                    {
                        return;
                    }
                    if (mainMapControl.CheckMxFile(pFileName)) //MapControl的CheckMxFile方法检查地图文档是否为效的地图文档，返回值为Bool
                    {
                        ClearAllData();
                        mainMapControl.LoadMxFile(pFileName);//MapControl的LoadMxFile方法 加载地图文档
                    }
                    else
                    {
                        MessageBox.Show(pFileName + "是无效的地图文档!", "信息提示");
                        return;
                    }
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show("打开地图文档失败" + ex.Message);
            }
        }

        #region 封装的方法
        private void ClearAllData()
        {
            if (mainMapControl.Map != null && mainMapControl.Map.LayerCount > 0)
            {
                //新建mainMapControl中Map
                IMap dataMap = new MapClass();
                dataMap.Name = "Map";
                mainMapControl.DocumentFilename = string.Empty;
                mainMapControl.Map = dataMap;

                //新建EagleEyeMapControl中Map
                IMap eagleEyeMap = new MapClass();
                eagleEyeMap.Name = "eagleEyeMap";
                EagleEyeMapControl.DocumentFilename = string.Empty;
                EagleEyeMapControl.Map = eagleEyeMap;
            }
        }
        #endregion

        #region IMapDocument方法加载Mxd文档文件

        private void iMapDocument方法ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            try
            {
                OpenFileDialog pOpenFileDialog = new OpenFileDialog();
                pOpenFileDialog.CheckFileExists = true;
                pOpenFileDialog.Title = "打开地图文档";
                pOpenFileDialog.Filter = "ArcMap文档(*.mxd)|*.mxd;|ArcMap模板(*.mxt)|*.mxt|发布地图文件(*.pmf)|*.pmf|所有地图格式(*.mxd;*.mxt;*.pmf)|*.mxd;*.mxt;*.pmf";
                pOpenFileDialog.Multiselect = false;
                pOpenFileDialog.RestoreDirectory = true;
                if (pOpenFileDialog.ShowDialog() == DialogResult.OK)
                {
                    string pFileName = pOpenFileDialog.FileName;
                    if (pFileName == "")
                    {
                        return;
                    }

                    if (mainMapControl.CheckMxFile(pFileName)) //检查地图文档有效性
                    {
                        //将数据载入pMapDocument并与Map控件关联
                        IMapDocument pMapDocument = new MapDocument();//using ESRI.ArcGIS.Carto;
                        pMapDocument.Open(pFileName, "");
                        //获取Map中激活的地图文档
                        mainMapControl.Map = pMapDocument.ActiveView.FocusMap;
                        mainMapControl.ActiveView.Refresh();
                    }
                    else
                    {
                        MessageBox.Show(pFileName + "是无效的地图文档!", "信息提示");
                        return;
                    }
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show("打开地图文档失败" + ex.Message);
            }
        }
        #endregion

    #region ControlsOpenDocCommandClass加载地图

        private void controlsOpenDocCommandClass方法ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            ICommand command = new ControlsOpenDocCommandClass();
            command.OnCreate(mainMapControl.Object);
            command.OnClick();
        }

        #endregion