ArcGIS Engine+C#开发教程：Bug修复与优化实例

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《ArcGIS Engine+C#实例开发教程》是一份针对ArcGIS Engine和C#结合使用的实战教程，它提供了一个深入学习和实践地理信息系统（GIS）开发的平台。本教程特别关注于解决实际开发过程中的问题和优化方案，旨在帮助开发者提升在ArcGIS Engine环境下利用C#进行应用程序开发的能力。在教程中，作者注意到一些具体的技术细节和编程挑战。例如，在第二讲，由于课程结构设计上的考虑，某些变量可能在后续章节中才会被声明，因此在早期可能会遇到变量未定义的错误。为解决这个问题，作者建议读者在使用这些变量前确认它们是否已经被正确初始化，或者按照教程的顺序逐步执行。另一个遇到的问题是第六讲中TOCControl（Table of Contents Control）的右键菜单无法弹出。这是由于没有正确绑定m_tocControl指针到控件实例上，导致在调用PopupMenu方法时出现问题。为修复这一bug，作者提供了修正后的代码示例，强调了在Form1_Load事件中设置控件引用的重要性。教程还提供了一项优化方案，针对第四讲中的坐标单位处理。原始代码使用了switch语句逐个处理不同单位，作者推荐采用Substring方法来简化处理，这不仅提高了代码效率，也使代码更加易读。《ArcGIS Engine+C#实例开发教程》不仅教授基础知识，还着重于实战技巧和常见问题的解决，对于想要在GIS开发领域深入学习C#编程的开发者来说，具有很高的实用价值。通过阅读和实践教程中的实例，开发者可以提升自己的技术水平，并避免在实际项目中遇到类似问题。

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

http://www.gissky.net/Article/1556.htm[2012-11-2 15:28:22]

m_pageLayoutControl.ActiveView.Deactivate();

//激活MapControl

m_mapControl.ActiveView.Activate(m_mapControl.hWnd);

//将之前MapControl最后使用的tool，作为活动的tool，赋给MapControl的Current

Tool

if (m_mapActiveTool != null) m_mapControl.CurrentTool = m_mapActiveTool;

m_IsMapCtrlactive = true;

//为每一个的framework controls,设置Buddy control为MapControl

this.SetBuddies(m_mapControl.Object);

}

catch (Exception ex)

{

throw new Exception(string.Format("ControlsSynchronizer::ActivateMap:\r\n{0}", ex.

Message));

}

/// <summary>

/// 激活PagleLayoutControl并减活MapCotrol

/// </summary>

public void ActivatePageLayout()

{

try

{

if (m_pageLayoutControl == null || m_mapControl == null)

throw new Exception("ControlsSynchronizer::ActivatePageLayout:\r\nEither MapCo

ntrol or PageLayoutControl are not initialized!");

//缓存当前MapControl的CurrentTool

if (m_mapControl.CurrentTool != null) m_mapActiveTool = m_mapControl.CurrentTo

ol;

//解除MapControl

m_mapControl.ActiveView.Deactivate();

//激活PageLayoutControl

m_pageLayoutControl.ActiveView.Activate(m_pageLayoutControl.hWnd);

//将之前PageLayoutControl最后使用的tool，作为活动的tool，赋给PageLayoutC

ontrol的CurrentTool

if (m_pageLayoutActiveTool != null) m_pageLayoutControl.CurrentTool = m_pageLa

youtActiveTool;

m_IsMapCtrlactive = false;

//为每一个的framework controls,设置Buddy control为PageLayoutControl

this.SetBuddies(m_pageLayoutControl.Object);

}

catch (Exception ex)

{

throw new Exception(string.Format("ControlsSynchronizer::ActivatePageLayout:\r\n{

0}", ex.Message));

}

/// <summary>

/// 给予一个地图, 置换PageLayoutControl和MapControl的focus map

/// </summary>

/// <param name="newMap"></param>

public void ReplaceMap(IMap newMap)

{

if (newMap == null)

throw new Exception("ControlsSynchronizer::ReplaceMap:\r\nNew map for replacem

ent is not initialized!");

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

http://www.gissky.net/Article/1556.htm[2012-11-2 15:28:22]

if (m_pageLayoutControl == null || m_mapControl == null)

throw new Exception("ControlsSynchronizer::ReplaceMap:\r\nEither MapControl or P

ageLayoutControl are not initialized!");

//create a new instance of IMaps collection which is needed by the PageLayout

//创建一个PageLayout需要用到的,新的IMaps collection的实例

IMaps maps = new Maps();

//add the new map to the Maps collection

//把新的地图加到Maps collection里头去

maps.Add(newMap);

bool bIsMapActive = m_IsMapCtrlactive;

//call replace map on the PageLayout in order to replace the focus map

//we must call ActivatePageLayout, since it is the control we call 'ReplaceMaps'

//调用PageLayout的replace map来置换focus map

//我们必须调用ActivatePageLayout,因为它是那个我们可以调用"ReplaceMaps"的Control

this.ActivatePageLayout();

m_pageLayoutControl.PageLayout.ReplaceMaps(maps);

//assign the new map to the MapControl

//把新的地图赋给MapControl

m_mapControl.Map = newMap;

//reset the active tools

//重设active tools

m_pageLayoutActiveTool = null;

m_mapActiveTool = null;

//make sure that the last active control is activated

//确认之前活动的control被激活

if (bIsMapActive)

{

this.ActivateMap();

m_mapControl.ActiveView.Refresh();

}

else

{

this.ActivatePageLayout();

m_pageLayoutControl.ActiveView.Refresh();

}

/// <summary>

/// bind the MapControl and PageLayoutControl together by assigning a new joint focus m

/// 指定共同的Map来把MapControl和PageLayoutControl绑在一起

/// </summary>

/// <param name="mapControl"></param>

/// <param name="pageLayoutControl"></param>

/// <param name="activateMapFirst">true if the MapControl supposed to be activated fir

st,如果MapControl被首先激活,则为true</param>

public void BindControls(IMapControl3 mapControl, IPageLayoutControl2 pageLayoutCont

rol, bool activateMapFirst)

{

if (mapControl == null || pageLayoutControl == null)

throw new Exception("ControlsSynchronizer::BindControls:\r\nEither MapControl or P

ageLayoutControl are not initialized!");

m_mapControl = MapControl;

m_pageLayoutControl = pageLayoutControl;

this.BindControls(activateMapFirst);

}

/// <summary>

/// bind the MapControl and PageLayoutControl together by assigning a new joint focus m

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

http://www.gissky.net/Article/1556.htm[2012-11-2 15:28:22]

/// 指定共同的Map来把MapControl和PageLayoutControl绑在一起

/// </summary>

/// <param name="activateMapFirst">true if the MapControl supposed to be activated fir

st,如果MapControl被首先激活,则为true</param>

public void BindControls(bool activateMapFirst)

{

if (m_pageLayoutControl == null || m_mapControl == null)

throw new Exception("ControlsSynchronizer::BindControls:\r\nEither MapControl or P

ageLayoutControl are not initialized!");

//create a new instance of IMap

//创造IMap的一个实例

IMap newMap = new MapClass();

newMap.Name = "Map";

//create a new instance of IMaps collection which is needed by the PageLayout

//创造一个新的IMaps collection的实例,这是PageLayout所需要的

IMaps maps = new Maps();

//add the new Map instance to the Maps collection

//把新的Map实例赋给Maps collection

maps.Add(newMap);

//call replace map on the PageLayout in order to replace the focus map

//调用PageLayout的replace map来置换focus map

m_pageLayoutControl.PageLayout.ReplaceMaps(maps);

//assign the new map to the MapControl

//把新的map赋给MapControl

m_mapControl.Map = newMap;

//reset the active tools

//重设active tools

m_pageLayoutActiveTool = null;

m_mapActiveTool = null;

//make sure that the last active control is activated

//确定最后活动的control被激活

if (activateMapFirst)

this.ActivateMap();

else

this.ActivatePageLayout();

}

/// <summary>

///by passing the application's toolbars and TOC to the synchronization class, it saves you

the

///management of the buddy control each time the active control changes. This method a

ds the framework

///control to an array; once the active control changes, the class iterates through the arra

y and

///calles SetBuddyControl on each of the stored framework control.

/// </summary>

/// <param name="control"></param>

public void AddFrameworkControl(object control)

{

if (control == null)

throw new Exception("ControlsSynchronizer::AddFrameworkControl:\r\nAdded contr

ol is not initialized!");

m_frameworkControls.Add(control);

}

/// <summary>

/// Remove a framework control from the managed list of controls

/// </summary>

/// <param name="control"></param>

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

http://www.gissky.net/Article/1556.htm[2012-11-2 15:28:22]

Tags：ArcGIS Engine 责任编辑：gissky

public void RemoveFrameworkControl(object control)

{

if (control == null)

throw new Exception("ControlsSynchronizer::RemoveFrameworkControl:\r\nControl t

o be removed is not initialized!");

m_frameworkControls.Remove(control);

}

/// <summary>

/// Remove a framework control from the managed list of controls by specifying its index

in the list

/// </summary>

/// <param name="index"></param>

public void RemoveFrameworkControlAt(int index)

{

if (m_frameworkControls.Count < index)

throw new Exception("ControlsSynchronizer::RemoveFrameworkControlAt:\r\nIndex i

s out of range!");

m_frameworkControls.RemoveAt(index);

}

/// <summary>

/// when the active control changes, the class iterates through the array of the framework

controls

/// and calles SetBuddyControl on each of the controls.

/// </summary>

/// <param name="buddy">the active control</param>

private void SetBuddies(object buddy)

{

try

{

if (buddy == null)

throw new Exception("ControlsSynchronizer::SetBuddies:\r\nTarget Buddy Control

is not initialized!");

foreach (object obj in m_frameworkControls)

{

if (obj is IToolbarControl)

{

((IToolbarControl)obj).SetBuddyControl(buddy);

}

else if (obj is ITOCControl)

{

((ITOCControl)obj).SetBuddyControl(buddy);

}

catch (Exception ex)

{

throw new Exception(string.Format("ControlsSynchronizer::SetBuddies:\r\n{0}", ex.

Message));

}

#endregion

}

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ArcGIS Engine+C#开发教程：Bug修复与优化实例

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