使用XAML在WPF项目中承载ArcGIS Engine地图控件开发

用Windows Form进行ArcGIS Engine二次开发时常见的形式，当然也可以用WPF来进行ArcEngine的二次开发。

由于WPF很方便承载Windows Form控件，而Map Control、Toolbar Control、TOC Control等都是.NET 控件，当然也可以用XAML来承载ArcEngine的这些控件来开发了。

下面简单记述开发步骤：

1.打开VS2008，创建WPF应用程序；

2.添加程序集引用：

ESRI.ArcGIS.AxControls：包含地图控件

ESRI.ArcGIS.System：包含ArcGIS Engine license初始化类

WindowsFormsIntegration：包含WindowsFormsHost，用来在WPF中承载Windows控件

System.Windows.Forms

3.在XAML中添加名称空间：

xmlns:controlHost="clr-namespace:System.Windows.Forms.Integration;assembly=WindowsFormsIntegration"

添加初始化事件Loaded="Window_Loaded"

4.在XAML中添加Map Control、Toolbar Control、TOC Control控件，最后你的XAML代码看起来是这样：

<Window x:Class="WPFMapViewer.MapWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MapViewer Hosted in WPF" Height="433.29" Width="559.944" Loaded="Window_Loaded" Background="Beige"
MaxHeight="768" MaxWidth="1024"
xmlns:my="clr-namespace:System.Windows.Forms.Integration;assembly=WindowsFormsIntegration">
<Grid>
<my:WindowsFormsHost Name="mapHost" Margin="174,30,0,22" />
<my:WindowsFormsHost Margin="0,30,0,22" Name="tocHost" HorizontalAlignment="Left" Width="173" />
<my:WindowsFormsHost Height="30" Name="toolbarHost" VerticalAlignment="Top" Margin="0,0,252,0" />
<Button Content="MyZoomInBoxTool" x:Name="MyZoomInBoxTool" Click="MyZoomInBox_Click" HorizontalAlignment="Right" Width="120" Height="30" VerticalAlignment="Top" Panel.ZIndex="1" Margin="0,0,7.056,0"></Button>
<TextBlock Height="23.75" VerticalAlignment="Bottom" Name="textBlock1" Margin="0,0,7.056,0">Ready</TextBlock>
<Button x:Name="DrawCircleTool" Height="23" HorizontalAlignment="Right" Margin="0,5,153,0" VerticalAlignment="Top" Width="75" Click="DrawCircleTool_Click">DrawCircle</Button>
</Grid>
</Window>

5.编辑XAML的C#代码，添加Map Control、Toolbar Control、TOC Control三个变量，即

AxMapControl mapControl;
AxToolbarControl toolbarControl;
AxTOCControl tocControl;

并在初始化窗口的下面添加对这三个控件变量的创建，即

private void CreateEngineControls ()
{
mapControl = new AxMapControl ();
mapHost.Child = mapControl;
toolbarControl = new AxToolbarControl ();
toolbarHost.Child = toolbarControl;
tocControl = new AxTOCControl ();
tocHost.Child = tocControl;
}

6.在Window_Loaded事件中加载上述三个控件，如下：

private void LoadMap ()
{
//将TOC控件、Toolbar控件和地图控件绑定
tocControl.SetBuddyControl (mapControl);
toolbarControl.SetBuddyControl (mapControl);

//添加放大、缩小、打开地图文档等命令到Toolbar工具栏
toolbarControl.AddItem ("esriControls.ControlsOpenDocCommand");
toolbarControl.AddItem ("esriControls.ControlsAddDataCommand");
toolbarControl.AddItem ("esriControls.ControlsSaveAsDocCommand");
toolbarControl.AddItem ("esriControls.ControlsMapNavigationToolbar");
toolbarControl.AddItem ("esriControls.ControlsMapIdentifyTool");

//设置工具栏的外观
toolbarControl.BackColor =Color.FromArgb (245, 245, 220);
}

7.将上述代码连起来，你的代码看起来是这样：

public partial class MapWindow: Window
{
AxMapControl mapControl;
AxToolbarControl toolbarControl;
AxTOCControl tocControl;

public MapWindow ()
{
InitializeComponent ();
CreateEngineControls ();
}

private void CreateEngineControls ()
{
mapControl = new AxMapControl ();
mapHost.Child = mapControl;

toolbarControl = new AxToolbarControl ();
toolbarHost.Child = toolbarControl;

tocControl = new AxTOCControl ();
tocHost.Child = tocControl;
}

private void LoadMap ()
{
//将TOC控件、Toolbar控件和地图控件绑定
tocControl.SetBuddyControl (mapControl);
toolbarControl.SetBuddyControl (mapControl);

//添加放大、缩小、打开地图文档等命令到Toolbar工具栏
toolbarControl.AddItem ("esriControls.ControlsOpenDocCommand");
toolbarControl.AddItem ("esriControls.ControlsAddDataCommand");
toolbarControl.AddItem ("esriControls.ControlsSaveAsDocCommand");
toolbarControl.AddItem ("esriControls.ControlsMapNavigationToolbar");
toolbarControl.AddItem ("esriControls.ControlsMapIdentifyTool");

//设置工具栏的外观
toolbarControl.BackColor =Color.FromArgb (245, 245, 220);
}
private void Window_Loaded (object sender, RoutedEventArgs e)
{
LoadMap ();
}
}

8.ArcEngine的二次开发当然要License啦，在Windwos From的开发中可以用License控件来进行许可证的初始化，在这里就只能用代码在App.XAML.cs中初始化License了。

代码如下：

public partial class App: Application
{
public App ()
{
InitializeEngineLicense ();
}

private void InitializeEngineLicense ()
{
AoInitialize aoi = new AoInitializeClass ();

esriLicenseProductCode productCode = esriLicenseProductCode.esriLicenseProductCodeEngine;
if (aoi.IsProductCodeAvailable (productCode) == esriLicenseStatus.esriLicenseAvailable)
{
aoi.Initialize (productCode);
}
}
}

9.在WPF中添加自定义工具，如在视图上画圆形的工具，添加DrawCircleToolClass类，如下：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;
using ESRI.ArcGIS.ADF.CATIDs;
using ESRI.ArcGIS.Controls;
using ESRI.ArcGIS.Geometry;
using ESRI.ArcGIS.Display;
using ESRI.ArcGIS.Carto;
using ESRI.ArcGIS.ADF.BaseClasses;

namespace WPFMapViewer.MapTool
{
[ClassInterface(ClassInterfaceType.None)]
[Guid("48BD64CD-3369-47FC-8EC5-94A5B644E8DA")]

public class DrawCircleToolClass : BaseTool
{
[ComRegisterFunction()]
[ComVisible(false)]
static void RegisterFunction(Type registerType)
{
ArcGISCategoryRegistration(registerType);
}

[ComUnregisterFunction()]
[ComVisible(false)]
static void UnregisterFunction(Type registerType)
{
ArcGISCategoryUnregistration(registerType);
}

private static void ArcGISCategoryRegistration(Type registerType)
{
string regKey = string.Format("HKEY_CLASSES_ROOT//CLSID//{{{0}}}", registerType.GUID);
ControlsCommands.Register(regKey);
}

private static void ArcGISCategoryUnregistration(Type registerType)
{
string regKey = string.Format("HKEY_CLASSES_ROOT//CLSID//{{{0}}}", registerType.GUID);
ControlsCommands.Unregister(regKey);
}

private IHookHelper m_hookHelper;
private INewCircleFeedback m_feedBack;

private IPoint m_point;
private Boolean m_isMouseDown;

private IDisplayFeedback displayFeedback = null;

public DrawCircleToolClass()
{
m_hookHelper = new HookHelperClass();
}

~DrawCircleToolClass()
{
m_hookHelper = null;
}

public override void OnCreate(object hook)
{
m_hookHelper.Hook = hook;
}

public override bool Enabled
{
get
{
if (m_hookHelper.FocusMap == null) return false;
return (m_hookHelper.FocusMap.LayerCount > 0);
}
}

public override void OnMouseDown(int Button, int Shift, int X, int Y)
{
//Create a point in map coordinates
IActiveView pActiveView = (IActiveView)m_hookHelper.FocusMap;
m_point = pActiveView.ScreenDisplay.DisplayTransformation.ToMapPoint(X, Y);
displayFeedback = new NewCircleFeedbackClass();
m_isMouseDown = true;

}

public override void OnMouseMove(int button, int shift, int x, int y)
{
if (!m_isMouseDown) return;

IActiveView pActiveView = (IActiveView)m_hookHelper.FocusMap;
if (m_feedBack == null)
{
m_feedBack = new NewCircleFeedbackClass();
m_feedBack.Display = pActiveView.ScreenDisplay;
m_feedBack.Start(m_point);
}

m_feedBack.MoveTo(pActiveView.ScreenDisplay.DisplayTransformation.ToMapPoint(x, y));
}

public override void OnMouseUp(int button, int shift, int x, int y)
{
if (!m_isMouseDown) return;
IActiveView pActiveView = (IActiveView)m_hookHelper.FocusMap;
ICircularArc pCircle;

pCircle = m_feedBack.Stop();

if (pCircle.Radius < 0.5)
{
m_feedBack = null;
m_isMouseDown = false;
}

if (pCircle != null)
{
ISegmentCollection segCollection = new PolygonClass() as ISegmentCollection;
object o = Type.Missing;
segCollection.AddSegment(pCircle as ISegment, ref o, ref o);
IPolygon polygon = segCollection as IPolygon;

IRgbColor rgbColor = new RgbColorClass();
rgbColor.Red = 255;

IColor color = rgbColor;
ISimpleFillSymbol simpleFillSymbol = new SimpleFillSymbolClass();
simpleFillSymbol.Color = color;

IElement element;
IPolygonElement polygonElement = new PolygonElementClass();
element = polygonElement as IElement;
IFillShapeElement fillShapeElement = polygonElement as IFillShapeElement;
fillShapeElement.Symbol = simpleFillSymbol;
element.Geometry = polygon as IGeometry;

IGraphicsContainer pGraphicContainer = pActiveView.GraphicsContainer;
pGraphicContainer.AddElement(element, 0);
pActiveView.PartialRefresh(esriViewDrawPhase.esriViewGraphics, null, null);
}

m_feedBack = null;
m_isMouseDown = false;
}

}
}

注意：要添加ArcEngine的相关程序集的引用，如：ESRI.ArcGIS.ADF,ESRI.ArcGIS.Carti,ESRI.ArcGIS.Controls,ESRI.ArcGIS.Display,ESRI.ArcGIS.Geometry,ESRI.ArcGIS.SystemUI

10.在XAML中添加一个Button,并添加一个事件，DrawCircleTool_Click，在C#代码中添加该事件的代码如下：

//绘制圆形
private void DrawCircleTool_Click(object sender, RoutedEventArgs e)
{
ICommand DrawCircleTool = new DrawCircleToolClass();
DrawCircleTool.OnCreate(mapControl.Object);
mapControl.CurrentTool = (ITool)DrawCircleTool;
}

11.最后执行程序，可以在加载地图文档，放大、缩小地图，也可以用自定义的画圆的工具在地图画圆。