常用ArcEngine开发代码

●·● 目录：

A1 …………实现：鼠标滑过显示要素 tip
A2 …………实现：通过鼠标选择要素并高亮显示（ISelectionEnvironment）
A3 …………实现：只显示筛选的要素（IFeatureLayerDefinition）
A4 …………实现：高亮显示筛选的要素（IFeatureSelection）
A5 …………实现：类似 ArcMap 中 Identify 工具的效果（IIdentify、IArray、IIdentifyObj）
A6 …………实现：在 MapControl 上绘制几何图形
　　　　 　　实现：在 MapControl 上绘制几何图形（IGraphicsContainer，几何：圆）

A7 …………实现：在 MapControl 自由旋转地图（IScreenDisplay [RotateMoveTo]）
　　实现：在 MapControl 中鼠标与地图反向移动（IScreenDisplay [PanMoveTo]）

A8 …………实现：弹出颜色选择器（IColorPalette、IColorSelector、IColorBrowser）
　　　　 　　实现：获取控件的屏幕位置（两种方法）

A9 …………实现：实现：Symbol 对象（ISimpleMarkerSymbol、Arrow、Character、Picture）

G1 …………实现：Symbol 对象
G2 …………实现：显示图层的属性窗口
G3 …………实现：PageLayoutControl 的样式设置（IBorder、IBackground、IShadow、IMapGrid）
G4 …………实现：删除shapefile文件中的重复数据
G5 …………实现：MapControl 与 PageLayoutControl 的交互
G6 …………实现：制作可以浮动的工具栏
G7 …………实现：ArcGIS Engine 实现鹰眼 & 分析（IGraphicsContainer、IFillShapeElement）
G8 …………实现：独立窗口的鹰眼显示（IHookHelper）
G9 …………实现：自定义工具窗口（ICustomizeDialog、ICustomizeDialogEvents）

U1 …………实现：Map 与 PageLayout 切换后工具不变
U2 …………实现：在窗体中显示渐变颜色 & 根据名称获取控件（IAlgorithmicColorRamp、IEnumColor）
U3 …………实现：获取地图是否处于编辑状态（IDataset、IWorkspaceEdit）
U4 …………实现：获取地图是否处于编辑状态
U5 …………实现：获取地图是否处于编辑状态

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╠════╣第A1个 ╠══════════════════════════════════════════════════╣
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●·●实现：鼠标滑过显示要素 tip：

对于这个有两个方法：

第一种：通过将 axmapcontrol 自带的 ShowMapTips 属性设置为 true 来实现。

第二种：通过 .NET 自带的控件 ToolTip 来实现！

第一种代码：

private void axMapControl1_OnMouseMove(object sender, IMapControlEvents2_OnMouseMoveEvent e)
{
    axMapControl1.ShowMapTips = true;
    IFeatureLayer pFeatureLayer = axMapControl1.Map.get_Layer(0) as IFeatureLayer;
    pFeatureLayer.DisplayField = "Name";
    pFeatureLayer.ShowTips = true;
}

第二种代码：

private void axMapControl1_OnMouseMove(object sender, IMapControlEvents2_OnMouseMoveEvent e)
{
 IFeatureLayer pFeatureLayer = axMapControl1.Map.get_Layer(0) as IFeatureLayer;
    pFeatureLayer.DisplayField = "Name";
    pFeatureLayer.ShowTips = true;
    string pTip;
    pTip = pFeatureLayer.get_TipText(e.mapX, e.mapY, axMapControl1.ActiveView.FullExtent.Width / 10000);
    if (pTip != null)
    {
        toolTip1.SetToolTip(axMapControl1, "名称：" + pTip);
    }
    else           //当 ToolTip 空间显示的内容为 null 的时候，就不会显示了！相当于隐藏了！
    {
        toolTip1.SetToolTip(axMapControl1, "");
    }
}

以上两种方法都可以实现显示标注，但是第二种效果更好一点~！

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●·●实现：通过鼠标选择要素并高亮显示：

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●·●ISelectionEnvironment 接口：

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通过 IMap 接口的 SelectByShape 方法来实现！同时可以修改高亮显示的颜色！

        private void axMapControl1_OnMouseDown(object sender, IMapControlEvents2_OnMouseDownEvent e)
        {
            axMapControl1.MousePointer = esriControlsMousePointer.esriPointerDefault;
            IMap pMap = axMapControl1.Map;
            IGeometry pGeometry = axMapControl1.TrackRectangle();       //获取框选几何
            ISelectionEnvironment pSelectionEnv = new SelectionEnvironment(); //新建选择环境
            IRgbColor pColor = new RgbColor();
            pColor.Red = 255;
            pSelectionEnv.DefaultColor = pColor;         //设置高亮显示的颜色！

            pMap.SelectByShape(pGeometry, pSelectionEnv, false); //选择图形！
            axMapControl1.Refresh(esriViewDrawPhase.esriViewGeoSelection, null, null);
        }

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●·●实现：只显示筛选的要素：

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●·●IFeatureLayerDefinition 接口：

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1. 通过 IFeatureLayerDefinition 接口的 DefinitionExpression 属性可以实现！

IFeatureLayer pFeatureLayer = axMapControl1.Map.get_Layer(0) as IFeatureLayer;
IFeatureLayerDefinition pFeatLyrDef = pFeatureLayer as IFeatureLayerDefinition; //新建 IFeatureLayerDefinition 接口实例
pFeatLyrDef.DefinitionExpression = "Area > 20";　　//定义筛选条件
axMapControl1.ActiveView.Refresh();　　//刷新

这样便只显示符合要求的部分了！即面积大于20的要素！

2. 通过 IFeatureLayerDefinition 接口的 CreatSelectionLayer 方法可以通过筛选建立新图层！

IFeatureLayer pFeatureLayer = axMapControl1.Map.get_Layer(0) as IFeatureLayer;
IFeatureLayerDefinition pFeatLyrDef = pFeatureLayer as IFeatureLayerDefinition;
pFeatLyrDef.DefinitionExpression = "Area > 20";
axMapControl1.ActiveView.Refresh();         //重新定义的图层

IQueryFilter pQueryFilter = new QueryFilter();
pQueryFilter.WhereClause = "POP > 10";

IFeatureSelection pFeatSel = pFeatureLayer as IFeatureSelection;
pFeatSel.SelectFeatures(pQueryFilter, esriSelectionResultEnum.esriSelectionResultNew, false);
axMapControl1.Refresh(esriViewDrawPhase.esriViewGeoSelection, null, null);　　//在新定义图层的基础上进行的查询

IFeatureLayer pNewFeat = pFeatLyrDef.CreateSelectionLayer("New Layer", true, null, null);　　//新建的图层包括上面两者的交集部分！
pFeatSel.Clear();
axMapControl1.Map.AddLayer(pNewFeat);
MessageBox.Show(axMapControl1.Map.LayerCount.ToString());

首先是建立一个虚拟的新图层，然后在此新图层的基础上进行筛选，然后从而生成新的图层！

参考：http://blog.csdn.net/qinyilang/article/details/6575539
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●·●实现：高亮显示筛选的要素：

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●·●IFeatureSelection 接口：

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通过 IFeatureSelection 接口的 SelectFeatures 方法可以实现！

IFeatureLayer pFeatureLayer = axMapControl1.Map.get_Layer(0) as IFeatureLayer;
IQueryFilter pQueryFilter = new QueryFilter();　　//建立查询
pQueryFilter.WhereClause = "POP > 10";
IFeatureSelection pFeatSel = pFeatureLayer as IFeatureSelection;　　//新建 IFeatureSelection 接口实例
pFeatSel.SelectFeatures(pQueryFilter, esriSelectionResultEnum.esriSelectionResultNew, false);　　//实现方法，选择筛选的部分！
axMapControl1.Refresh(esriViewDrawPhase.esriViewGeoSelection, null, null);

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●·●实现：类似 ArcMap 中 Identify 工具的效果：

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●·●IIdentify 接口：

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●·●IIdentifyObj 接口：

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●·●IArray 接口：

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主要实现点击查询并闪烁显示，并把查询要素的信息通过DataGridView显示出来，主要用到的接口：IIdentity、IArray、IIdentifyObj

IIdentify pIdentify = axMapControl1.Map.get_Layer(0) as IIdentify; //通过图层获取 IIdentify 实例
IPoint pPoint = new ESRI.ArcGIS.Geometry.Point(); //新建点来选择
IArray pIDArray;
IIdentifyObj pIdObj;

pPoint.PutCoords(e.mapX, e.mapY);      //定义点
pIDArray = pIdentify.Identify(pPoint);       //通过点获取数组，用点一般只能选择一个元素
if (pIDArray != null)
{
    pIdObj = pIDArray.get_Element(0) as IIdentifyObj; //取得要素
    pIdObj.Flash(axMapControl1.ActiveView.ScreenDisplay);       //闪烁效果
    MessageBox.Show("Layer: " + pIdObj.Layer.Name + "\n" + "Feature: " + pIdObj.Name); //输出信息
}
else
{
    MessageBox.Show("Nothing!");
}

效果：

框选实现如下所示：

IIdentify pIdentify = axMapControl1.Map.get_Layer(0) as IIdentify;
IGeometry pGeo = axMapControl1.TrackRectangle() as IGeometry;
IArray pIDArray;
IIdentifyObj pIdObj;

pIDArray = pIdentify.Identify(pGeo);
if (pIDArray != null)
{
    string str = "\n";
    string lyrName = "";
    for (int i = 0; i < pIDArray.Count;i++ )
    {
        pIdObj = pIDArray.get_Element(i) as IIdentifyObj;
        pIdObj.Flash(axMapControl1.ActiveView.ScreenDisplay);
        str += pIdObj.Name + "\n";
        lyrName = pIdObj.Layer.Name;
    }
    MessageBox.Show("Layer: " + lyrName + "\n" + "Feature: " + str);
}
else
{
    MessageBox.Show("Nothing!");
}

效果如下：

参考：http://blog.csdn.net/mjhwy/article/details/7337426

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●·●实现：在 MapControl 上绘制几何图形：

可以直接使用 axMapControl1.DrawShape 方法来实现~！

ISimpleLineSymbol pLineSym = new SimpleLineSymbol();
IRgbColor pColor = new RgbColor();
pColor.Red = 11;
pColor.Green = 120;
pColor.Blue = 233;
pLineSym.Color = pColor;
pLineSym.Style = esriSimpleLineStyle.esriSLSSolid;
pLineSym.Width = 2;

IPolyline pLine = axMapControl1.TrackLine() as IPolyline;

object symbol = pLineSym as object;
axMapControl1.DrawShape(pLine, ref symbol);

也可以通过 IScreenDisplay 接口的方法来实现！~

ISimpleLineSymbol pLineSym = new SimpleLineSymbol();
IRgbColor pColor = new RgbColor();
pColor.Red = 11;
pColor.Green = 120;
pColor.Blue = 233;
pLineSym.Color = pColor;
pLineSym.Style = esriSimpleLineStyle.esriSLSSolid;
pLineSym.Width = 2;

IPolyline pLine = axMapControl1.TrackLine() as IPolyline;

IScreenDisplay pScreenDisplay = axMapControl1.ActiveView.ScreenDisplay;
pScreenDisplay.StartDrawing(pScreenDisplay.hDC, 1);
pScreenDisplay.SetSymbol(pLineSym as ISymbol);
pScreenDisplay.DrawPolyline(pLine);
pScreenDisplay.FinishDrawing();

通过比较，只是后面实现的部分不同，前面都是相同的！

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●·●实现：在 MapControl 上绘制几何图形（IGraphicsContainer，几何：圆）：

　　普通的图形，可以直接向下面一样实现！

m_ActiveView = m_hookHelper.ActiveView;
m_Map = m_hookHelper.FocusMap;
IScreenDisplay pScreenDisplay = m_ActiveView.ScreenDisplay;
IRubberBand pRubberPolygon = new RubberPolygonClass();
ISimpleFillSymbol pFillSymbol = new SimpleFillSymbolClass();
pFillSymbol.Color = getRGB(255, 255, 0);
IPolygon pPolygon = pRubberPolygon.TrackNew(pScreenDisplay, (ISymbol)pFillSymbol) as IPolygon;
pFillSymbol.Style = esriSimpleFillStyle.esriSFSDiagonalCross;
pFillSymbol.Color = getRGB(0, 255, 255);
IFillShapeElement pPolygonEle = new PolygonElementClass();
pPolygonEle.Symbol = pFillSymbol;
IElement pEle = pPolygonEle as IElement;
pEle.Geometry = pPolygon;
IGraphicsContainer pGraphicsContainer = m_Map as IGraphicsContainer;
pGraphicsContainer.AddElement(pEle, 0);
m_ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGraphics, null, null);

　　画圆比较特殊，因为没有圆这个现成的几何体，因此要转换，如下所示：

m_ActiveView = m_hookHelper.ActiveView;
m_Map = m_hookHelper.FocusMap;
IScreenDisplay pScreenDisplay = m_ActiveView.ScreenDisplay;
IRubberBand pRubberCircle = new RubberCircleClass();
ISimpleFillSymbol pFillSymbol = new SimpleFillSymbolClass();
pFillSymbol.Color = getRGB(255, 255, 0);
IGeometry pCircle = pRubberCircle.TrackNew(pScreenDisplay, (ISymbol)pFillSymbol) as IGeometry;

IPolygon pPolygon = new PolygonClass();　　　　//空的多边形
ISegmentCollection pSegmentCollection = pPolygon as ISegmentCollection;　　//段集合
ISegment pSegment = pCircle as ISegment;　　//将圆赋值给段
object missing = Type.Missing;　　//显示默认值
pSegmentCollection.AddSegment(pSegment, ref missing, ref missing);　　//给空多边形加入圆
pFillSymbol.Style = esriSimpleFillStyle.esriSFSDiagonalCross;
pFillSymbol.Color = getRGB(0, 255, 255);
IFillShapeElement pPolygonEle = new PolygonElementClass();
pPolygonEle.Symbol = pFillSymbol;
IElement pEle = pPolygonEle as IElement;
pEle.Geometry = pPolygon;
IGraphicsContainer pGraphicsContainer = m_Map as IGraphicsContainer;
pGraphicsContainer.AddElement(pEle, 0);
m_ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGraphics, null, null);

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●·●实现：在 MapControl 自由旋转地图：

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●·●IScreenDisplay 接口：

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通过 IScreenDisplay 接口来实现！

//鼠标按下！
private void axMapControl1_OnMouseDown(object sender, IMapControlEvents2_OnMouseDownEvent e)
{
    IPoint pPoint = new PointClass();
    pPoint.PutCoords(e.mapX, e.mapY);
    IPoint pCentrePoint = new PointClass();
    pCentrePoint.PutCoords(axMapControl1.Extent.XMin + axMapControl1.ActiveView.Extent.Width / 2,
        axMapControl1.Extent.YMax - axMapControl1.ActiveView.Extent.Height / 2); //获取图像的中心位置
 axMapControl1.ActiveView.ScreenDisplay.RotateStart(pPoint, pCentrePoint); //开始旋转
}

//鼠标移动！
private void axMapControl1_OnMouseMove(object sender, IMapControlEvents2_OnMouseMoveEvent e)
{
    IPoint pPoint = new PointClass();
    pPoint.PutCoords(e.mapX, e.mapY);
    axMapControl1.ActiveView.ScreenDisplay.RotateMoveTo(pPoint);    //旋转到鼠标的位置
 axMapControl1.ActiveView.ScreenDisplay.RotateTimer(); //可以忽略
}

//鼠标抬起！
private void axMapControl1_OnMouseUp(object sender, IMapControlEvents2_OnMouseUpEvent e)
{
    double dRotationAngle = axMapControl1.ActiveView.ScreenDisplay.RotateStop(); //获取旋转的角度
 axMapControl1.Rotation = dRotationAngle; //赋值给 axMapControl1.Rotation，这下真的旋转了！
 axMapControl1.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeography, null, null); //刷新！
}

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●·●实现：在 MapControl 中鼠标与地图反向移动：

double startMapX = 0;
double startMapY = 0;
IScreenDisplay pScreenDisplay;

private void Form1_Load(object sender, EventArgs e)　　//窗体加载信息
{
    pScreenDisplay = axMapControl1.ActiveView.ScreenDisplay;
}

private void axMapControl1_OnMouseDown(object sender, IMapControlEvents2_OnMouseDownEvent e)　　//鼠标按下的时候触发
{
    IPoint pPoint = new PointClass();
    pPoint.PutCoords(e.mapX, e.mapY);
    pScreenDisplay.PanStart(pPoint);

    startMapY = e.mapY;
    startMapX = e.mapX;
}

private void axMapControl1_OnMouseMove(object sender, IMapControlEvents2_OnMouseMoveEvent e)　　//鼠标移动的时候触发
{
    IPoint pPoint = new PointClass();
    pPoint.PutCoords(startMapX * 2 - e.mapX, startMapY * 2 - e.mapY);   //获取当前点关于起始点的对称点

    pScreenDisplay.PanMoveTo(pPoint);
}

private void axMapControl1_OnMouseUp(object sender, IMapControlEvents2_OnMouseUpEvent e)　　　　//鼠标松开的时候触发
{
    pScreenDisplay.PanStop();
}

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●·●实现：弹出颜色选择器：

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●·●IColorPalette 接口：

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1. ColorPalette：

private void button1_Click(object sender, EventArgs e)
{
    IColor pColor = new RgbColor();
    pColor.RGB = 255;
    tagRECT pTag = new tagRECT();
    pTag.left = this.Left + button1.Left + button1.Width;
    pTag.bottom = this.Top + button1.Top + button1.Height;
    IColorPalette pColorPalette = new ColorPalette();
    pColorPalette.TrackPopupMenu(ref pTag, pColor, false, 0);
    pColor = pColorPalette.Color;
}

效果：

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╠════╣第A8A个 ╠══════════════════════════════════════════════════╣
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●·●实现：获取控件的屏幕位置（两种方法）：

第一种：将控件坐标转换为屏幕坐标！

pTag.left = button1.PointToScreen(System.Drawing.Point.Empty).X;
pTag.bottom = button1.PointToScreen(System.Drawing.Point.Empty).Y + button1.Height;

第二种：通过空间之间属性的间接计算！注：button1 在 groupBox2 中！

pTag.left = SystemInformation.FrameBorderSize.Width + this.Left + groupBox2.Left + button1.Left;
pTag.bottom = (this.Height - this.ClientRectangle.Height - SystemInformation.FrameBorderSize.Height) + this.Top + groupBox2.Top + button1.Top + button1.Height;

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●·●IColorSelector 接口：

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2. ColorSelector：

IColor pColor = new RgbColor();
pColor.RGB = 255;
IColorSelector pSelector = new ColorSelectorClass();
pSelector.Color = pColor;
if (pSelector.DoModal(0))
{
    pColor = pSelector.Color;
}

效果：

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●·●IColorBrowser 接口：

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3. ColorBrowser：

IColor pColor = new RgbColor();
pColor.RGB = 255;
IColorBrowser pColorBrowser = new ColorBrowser();
pColorBrowser.Color = pColor;
if (pColorBrowser.DoModal(0))
{
    pColor = pColorBrowser.Color;
}

效果：

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●·●实现：颜色台（Color Ramp）：

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●·●IAlgorithmicColorRamp 接口：

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1. AlgorithmicColorRamp：

定义函数：

private IEnumColors CreateColorRamp(IColor fromColor,IColor toColor,int count)
{
    IAlgorithmicColorRamp pRampColor = new AlgorithmicColorRamp();
    pRampColor.FromColor = fromColor;
    pRampColor.ToColor = toColor;
    pRampColor.Size = count;
    bool ok = false;
    pRampColor.CreateRamp(out ok);
    if (ok)
    {
        return pRampColor.Colors;
    }
    else
    {
        return null;
    }
}

调用函数：颜色在 red 和 violet 之间变化！

private void timer1_Tick(object sender, EventArgs e)
{
    IRgbColor fromColor = new RgbColor();
    fromColor.Red = 255;
    IRgbColor toColor = new RgbColor();
    toColor.Red = 128;
    toColor.Blue = 255;
    IEnumColors pEnumColors = CreateColorRamp(fromColor, toColor, 50);
    IColor pColor = null;
    for (int i = 0; i < count;i++ )
    {
        pColor = pEnumColors.Next();
    }
    if (count == 50)
    {
        count = 0;
        timer1.Enabled = false;
        timer2.Enabled = true;
    }
    count++;
    axPageLayoutControl1.PageLayout.Page.BackgroundColor = pColor;
}

private void timer2_Tick(object sender, EventArgs e)
{
    IRgbColor fromColor = new RgbColor();
    fromColor.Red = 128;
    fromColor.Blue = 255;
    IRgbColor toColor = new RgbColor();
    toColor.Red = 255;
    IEnumColors pEnumColors = CreateColorRamp(fromColor, toColor, 20);
    IColor pColor = null;
    for (int i = 0; i < count; i++)
    {
        pColor = pEnumColors.Next();
    }
    if (count == 20)
    {
        count = 0;
        timer2.Enabled = false;
        timer1.Enabled = true;
    }
    count++;
    axPageLayoutControl1.PageLayout.Page.BackgroundColor = pColor;
}

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●·●IRandomColorRamp 接口：

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2. RandomColorRamp：

定义函数：

private IColor CreateRandomColorRamp()
{
    IRandomColorRamp pRandomColor = new RandomColorRamp();
    pRandomColor.StartHue = 140;
    pRandomColor.EndHue = 220;
    pRandomColor.MinValue = 35;
    pRandomColor.MaxValue = 100;
    pRandomColor.MinSaturation = 32;
    pRandomColor.MaxSaturation = 100;

    pRandomColor.Size = 12;
    pRandomColor.Seed = 7;
    bool ok = true;
    pRandomColor.CreateRamp(out ok);
    IEnumColors pEnumColors = pRandomColor.Colors;
    IColor pColor = pEnumColors.Next();
    return pColor;
}

调用函数

private void button5_Click(object sender, EventArgs e)
{
    IColor pColor = CreateRandomColorRamp();
    axPageLayoutControl2.PageLayout.Page.BackgroundColor = pColor;
} 

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●·●实现：Symbol 对象：

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●·●ISimpleMarkerSymbol 接口：

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1. SimpleMarkerSymbol：

新建工具！

using System;
using System.Drawing;
using System.Runtime.InteropServices;
using ESRI.ArcGIS.ADF.BaseClasses;
using ESRI.ArcGIS.ADF.CATIDs;
using ESRI.ArcGIS.Controls;
using System.Windows.Forms;
using ESRI.ArcGIS.Display;
using ESRI.ArcGIS.Geometry;

namespace Symbol
{
    /// 

    /// Summary description for Tool1.
    /// 
    [Guid("63835a8e-ae77-4817-b4e4-3b120b5232f9")]
    [ClassInterface(ClassInterfaceType.None)]
    [ProgId("Symbol.Tool1")]
    public sealed class Tool1 : BaseTool
    {
        #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
        /// 

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

        }
        /// 

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

        }

        #endregion
        #endregion

//---------------------------------------------------------------------------------------------------------
        private IHookHelper m_hookHelper = null;
        private IMapControl4 pMapControl;
//---------------------------------------------------------------------------------------------------------

        public Tool1()
        {
            //
            // TODO: Define values for the public properties
            //
            base.m_category = "Marker"; //localizable text 
            base.m_caption = "Marker";  //localizable text 
            base.m_message = "Marker";  //localizable text
            base.m_toolTip = "Marker";  //localizable text
            base.m_name = "Marker";   //unique id, non-localizable (e.g. "MyCategory_MyTool")
            try
            {
                //
                // TODO: change resource name if necessary
                //
                string bitmapResourceName = GetType().Name + ".bmp";
                base.m_bitmap = new Bitmap(GetType(), bitmapResourceName);
                base.m_cursor = new System.Windows.Forms.Cursor(GetType(), GetType().Name + ".cur");
            }
            catch (Exception ex)
            {
                System.Diagnostics.Trace.WriteLine(ex.Message, "Invalid Bitmap");
            }
        }

        #region Overriden Class Methods

        /// 

        /// Occurs when this tool is created
        /// 
        /// Instance of the application
        public override void OnCreate(object hook)
        {
            if (m_hookHelper == null)
                m_hookHelper = new HookHelperClass();

            m_hookHelper.Hook = hook;

//---------------------------------------------------------------------------------------------------------
            if (hook is IMapControl4)
            {
                pMapControl = hook as IMapControl4;
            }
//---------------------------------------------------------------------------------------------------------
            
            // TODO:  Add Tool1.OnCreate implementation
        }

        /// 

        /// Occurs when this tool is clicked
        /// 
        public override void OnClick()
        {
            // TODO: Add Tool1.OnClick implementation
        }

        public override void OnMouseDown(int Button, int Shift, int X, int Y)
        {
            // TODO:  Add Tool1.OnMouseDown implementation

//---------------------------------------------------------------------------------------------------------
            ISimpleMarkerSymbol pMarkerSymbol = new SimpleMarkerSymbol();
            pMarkerSymbol.Style = esriSimpleMarkerStyle.esriSMSCross;
            pMarkerSymbol.Color = GetColor(255, 0, 0);
            pMarkerSymbol.Size = 16;
            pMarkerSymbol.Outline = true;
            pMarkerSymbol.OutlineSize = 4;
            pMarkerSymbol.OutlineColor = GetColor(0, 255, 0);
            IPoint pPoint = pMapControl.ActiveView.ScreenDisplay.DisplayTransformation.ToMapPoint(X, Y);
            object oMarkerSymbol = pMarkerSymbol;
            pMapControl.DrawShape(pPoint, ref oMarkerSymbol);
//---------------------------------------------------------------------------------------------------------
            
        }

//---------------------------------------------------------------------------------------------------------
        private IRgbColor GetColor(int r,int g,int b)
        {
            IRgbColor pColor = new RgbColor();
            pColor.Red = r;
            pColor.Green = g;
            pColor.Blue = b;
            return pColor;
        }
//---------------------------------------------------------------------------------------------------------

        public override void OnMouseMove(int Button, int Shift, int X, int Y)
        {
            // TODO:  Add Tool1.OnMouseMove implementation
        }

        public override void OnMouseUp(int Button, int Shift, int X, int Y)
        {
            // TODO:  Add Tool1.OnMouseUp implementation
        }
        #endregion
    }
}

调用：

        private void button1_Click(object sender, EventArgs e)
        {
            ICommand command = new Symbol.Tool1();
            command.OnCreate(axMapControl1.Object);
            axMapControl1.CurrentTool = command as ESRI.ArcGIS.SystemUI.ITool;
        }

---------------------------------------------------------------------------------------------------------

●·●IArrowMarkerSymbol 接口：

---------------------------------------------------------------------------------------------------------

2. ArrowMarkerSymbol：

public override void OnMouseDown(int Button, int Shift, int X, int Y)
{
    // TODO:  Add AddArrow.OnMouseDown implementation
    IArrowMarkerSymbol pArrowMarkerSymbol = new ArrowMarkerSymbol();
    pArrowMarkerSymbol.Style = esriArrowMarkerStyle.esriAMSPlain;
    pArrowMarkerSymbol.Color = GetColor(55, 111, 255);
    pArrowMarkerSymbol.Length = 20;
    pArrowMarkerSymbol.Angle = 90;
    pArrowMarkerSymbol.Width = 10;
    IPoint pPoint = pMapControl.ActiveView.ScreenDisplay.DisplayTransformation.ToMapPoint(X, Y);
    object symbol = pArrowMarkerSymbol;
    pMapControl.DrawShape(pPoint, ref symbol);
} 

---------------------------------------------------------------------------------------------------------

●·●ICharacterMarkerSymbol 接口：

---------------------------------------------------------------------------------------------------------

●·●stdole.StdFont：

---------------------------------------------------------------------------------------------------------

3. CharacterMarkerSymbol：

public override void OnMouseDown(int Button, int Shift, int X, int Y)
{
    // TODO:  Add Character.OnMouseDown implementation
    stdole.StdFont pFont = new stdole.StdFont();       //新建字体！
    pFont.Name = "ESRI Default Marker";
    pFont.Size = 37;
    pFont.Italic = true;

    ICharacterMarkerSymbol pCharacterSymbol = new CharacterMarkerSymbol();
    pCharacterSymbol.CharacterIndex = 60;
    pCharacterSymbol.Color = GetColor(0, 0, 255);
    pCharacterSymbol.Size = 25;
    IPoint pPoint = pMapControl.ActiveView.ScreenDisplay.DisplayTransformation.ToMapPoint(X, Y);
    object oCharMarkerSymbol = pCharacterSymbol;
    pMapControl.DrawShape(pPoint, ref oCharMarkerSymbol);
}

---------------------------------------------------------------------------------------------------------

●·●IPictureMarkerSymbol 接口：

---------------------------------------------------------------------------------------------------------

4. PictureMarkerSymbol：

public override void OnMouseDown(int Button, int Shift, int X, int Y)
{
    　　 // TODO:  Add Character.OnMouseDown implementation
    　　 IPictureMarkerSymbol pPictureSymbol = new PictureMarkerSymbol();
            pPictureSymbol.CreateMarkerSymbolFromFile(esriIPictureType.esriIPictureBitmap, @"F:\Desktop\1.bmp");
            pPictureSymbol.Size = 80;
            pPictureSymbol.BitmapTransparencyColor = GetColor(255, 255, 255);

            IPoint pPoint = pMapControl1.ActiveView.ScreenDisplay.DisplayTransformation.ToMapPoint(e.x, e.y);
            object oMarkerSymbol = pPictureSymbol;
            pMapControl1.DrawShape(pPoint, ref oMarkerSymbol);
}

---------------------------------------------------------------------------------------------------------

╔════════╗
╠════╣第G2个 ╠══════════════════════════════════════════════════╣
╚════════╝

●·●实现：显示图层的属性窗口：

首先新建 Command，下面是实现代码的重要部分！

private bool SetupFeaturePropertySheet(ILayer layer)
{
    if (layer == null) return false;
    ESRI.ArcGIS.Framework.IComPropertySheet pComPropSheet;
    pComPropSheet = new ESRI.ArcGIS.Framework.ComPropertySheet();
    pComPropSheet.Title = layer.Name + " - 属性";

    ESRI.ArcGIS.esriSystem.UID pPPUID = new ESRI.ArcGIS.esriSystem.UIDClass();
    pComPropSheet.AddCategoryID(pPPUID);

    // General....
    ESRI.ArcGIS.Framework.IPropertyPage pGenPage = new ESRI.ArcGIS.CartoUI.GeneralLayerPropPageClass();
    pComPropSheet.AddPage(pGenPage);

    // Source
    ESRI.ArcGIS.Framework.IPropertyPage pSrcPage = new ESRI.ArcGIS.CartoUI.FeatureLayerSourcePropertyPageClass();
    pComPropSheet.AddPage(pSrcPage);

    // Selection...
    ESRI.ArcGIS.Framework.IPropertyPage pSelectPage = new ESRI.ArcGIS.CartoUI.FeatureLayerSelectionPropertyPageClass();
    pComPropSheet.AddPage(pSelectPage);

    // Display....
    ESRI.ArcGIS.Framework.IPropertyPage pDispPage = new ESRI.ArcGIS.CartoUI.FeatureLayerDisplayPropertyPageClass();
    pComPropSheet.AddPage(pDispPage);

    // Symbology....
    ESRI.ArcGIS.Framework.IPropertyPage pDrawPage = new ESRI.ArcGIS.CartoUI.LayerDrawingPropertyPageClass();
    pComPropSheet.AddPage(pDrawPage);

    // Fields... 
    ESRI.ArcGIS.Framework.IPropertyPage pFieldsPage = new ESRI.ArcGIS.CartoUI.LayerFieldsPropertyPageClass();
    pComPropSheet.AddPage(pFieldsPage);

    // Definition Query... 
    ESRI.ArcGIS.Framework.IPropertyPage pQueryPage = new ESRI.ArcGIS.CartoUI.LayerDefinitionQueryPropertyPageClass();
    pComPropSheet.AddPage(pQueryPage);

    // Labels....
    ESRI.ArcGIS.Framework.IPropertyPage pSelPage = new ESRI.ArcGIS.CartoUI.LayerLabelsPropertyPageClass();
    pComPropSheet.AddPage(pSelPage);

    // Joins & Relates....
    ESRI.ArcGIS.Framework.IPropertyPage pJoinPage = new ESRI.ArcGIS.ArcMapUI.JoinRelatePageClass();
    pComPropSheet.AddPage(pJoinPage);

    // Setup layer link
    ESRI.ArcGIS.esriSystem.ISet pMySet = new ESRI.ArcGIS.esriSystem.SetClass();
    pMySet.Add(layer);
    pMySet.Reset();

    // make the symbology tab active
    pComPropSheet.ActivePage = 4;

    // show the property sheet
    bool bOK = pComPropSheet.EditProperties(pMySet, 0);

    m_activeView.PartialRefresh(esriViewDrawPhase.esriViewGeography, null, m_activeView.Extent);
    return (bOK);
}

完整实现的 Command 代码如下：

View Code

效果如下所示：

---------------------------------------------------------------------------------------------------------

╔════════╗
╠════╣第G3个 ╠══════════════════════════════════════════════════╣
╚════════╝

●·●实现：PageLayoutControl 的样式设置：

Border：

IActiveView pActiveView = axPageLayoutControl1.PageLayout as IActiveView;
IMap pMap = pActiveView.FocusMap;
IGraphicsContainer pGraphicsContainer = pActiveView as IGraphicsContainer;
IMapFrame pMapFrame = pGraphicsContainer.FindFrame(pMap) as IMapFrame;
IStyleSelector pStyleSelector = new BorderSelector();
if (pStyleSelector.DoModal(axPageLayoutControl1.hWnd))
{
    IBorder PBorder = pStyleSelector.GetStyle(0) as IBorder;
    pMapFrame.Border = PBorder;
}
axPageLayoutControl1.Refresh(esriViewDrawPhase.esriViewBackground, null, null);

Background：

IActiveView pActiveView = axPageLayoutControl1.PageLayout as IActiveView;
IMap pMap = pActiveView.FocusMap;
IGraphicsContainer pGraphicsContainer = pActiveView as IGraphicsContainer;
IMapFrame pMapFrame = pGraphicsContainer.FindFrame(pMap) as IMapFrame;
IStyleSelector pStyleSelector = new BackgroundSelector();
if (pStyleSelector.DoModal(axPageLayoutControl1.hWnd))
{
    IBackground pBackground = pStyleSelector.GetStyle(0) as IBackground;
    pMapFrame.Background = pBackground;
}
pActiveView.Refresh();

Shadow：

IActiveView pActiveView = axPageLayoutControl1.PageLayout as IActiveView;
IMap pMap = pActiveView.FocusMap;
IGraphicsContainer pGraphicsContainer = pActiveView as IGraphicsContainer;
IMapFrame pMapFrame = pGraphicsContainer.FindFrame(pMap) as IMapFrame;
IStyleSelector pStyleSelector = new ShadowSelector();
if (pStyleSelector.DoModal(axPageLayoutControl1.hWnd))
{
    IShadow pShadow = pStyleSelector.GetStyle(0) as IShadow;
    IFrameProperties pFrameProperties = pMapFrame as IFrameProperties;
    pFrameProperties.Shadow = pShadow;
}
pActiveView.Refresh();

MapGrid：

IActiveView pActiveView = axPageLayoutControl1.PageLayout as IActiveView;
IMap pMap = pActiveView.FocusMap;
IGraphicsContainer pGraphicsContainer = pActiveView as IGraphicsContainer;
IMapFrame pMapFrame = pGraphicsContainer.FindFrame(pMap) as IMapFrame;
IStyleSelector pStyleSelector = new MapGridSelector();
if (pStyleSelector.DoModal(axPageLayoutControl1.hWnd))
{
    IMapGrid pMapGrid = pStyleSelector.GetStyle(0) as IMapGrid;
    IMapGrids pMapGrids = pMapFrame as IMapGrids;
    if (pMapGrid == null)
    {
        return;
    }
    pMapGrids.AddMapGrid(pMapGrid);
}
pActiveView.Refresh();

---------------------------------------------------------------------------------------------------------

╔════════╗
╠════╣第G4个 ╠══════════════════════════════════════════════════╣
╚════════╝

●·●实现：删除shapefile文件中的重复数据：

第一种情况，只是出现重复数据，那么可以通过判断某一个字段值是否一样来进行删除重复的部分，实现如下：

IFeatureLayer pFeatureLayer = axMapControl1.get_Layer(0) as IFeatureLayer;
IFeatureClass pFeatureClass = pFeatureLayer.FeatureClass;
IFeatureCursor pFeatureCursor = pFeatureClass.Search(null, false);
IFeature pFeature = pFeatureCursor.NextFeature();
int count = 1;
while (pFeature != null)
{
    string name = pFeature.get_Value(pFeatureClass.FindField("Name")).ToString();    //首先获取Name字段的名称属性
    while (pFeature != null)    //外层遍历
    {
        pFeature = pFeatureCursor.NextFeature();    //开始检查下一个要素与目标要素的关系
        if (pFeature == null)   //若已经没有了，则终止
            break; //跳出
        string findName = pFeature.get_Value(pFeatureClass.FindField("Name")).ToString();
        if (findName == name)   //若名称相同，则删除此要素
            pFeature.Delete();
    }
    pFeatureCursor = pFeatureClass.Search(null, false); //重新从头开始
    for (int i = 0; i <= count;i++ )    //为了获取比上一个目标要素下一个的目标，通过count来遍历
        pFeature = pFeatureCursor.NextFeature();
    count++;    //每执行一次操作，增加一次count
}

第二种情况，不仅出现某些属性，例如Name相同，但是几何体不是相同的，其中的一部分是残缺的，这个时候就要动用Area了，因为只有最大的那个Area才是完整的，因此要删除掉其他小的部分，可以按照如下实现：

IFeatureLayer pFeatureLayer = axMapControl1.get_Layer(0) as IFeatureLayer;
IFeatureClass pFeatureClass = pFeatureLayer.FeatureClass;
IFeatureCursor pFeatureCursor = pFeatureClass.Search(null, false);
IFeature pFeature = pFeatureCursor.NextFeature();
int count = 1;
while (pFeature != null)
{
    string name = pFeature.get_Value(pFeatureClass.FindField("Name")).ToString();    //首先获取Name字段的名称属性
    double area = Convert.ToDouble(pFeature.get_Value(pFeatureClass.FindField("Area")));   //获取Area的大小
    while (pFeature != null)    //外层遍历
    {
        pFeature = pFeatureCursor.NextFeature();    //开始检查下一个要素与目标要素的关系
        if (pFeature == null)   //若已经没有了，则在从头开始
        {
            pFeatureCursor = pFeatureClass.Search(null, false); //重新从头开始
            pFeature = pFeatureCursor.NextFeature();
        }
        string findName = pFeature.get_Value(pFeatureClass.FindField("Name")).ToString();
        double findArea = Convert.ToDouble(pFeature.get_Value(pFeatureClass.FindField("Area")));
        if (findName == name && findArea < area)   //若名称相同，且面积小的时候才删除，大的话就pass
            pFeature.Delete();
        else if (findName == name && findArea == area)  //要是相同，则说明又碰到自己了，证明已经一圈过去了
            break;
    }
    pFeatureCursor = pFeatureClass.Search(null, false); //重新从头开始
    for (int i = 0; i <= count;i++ )    //为了获取比上一个目标要素下一个的目标，通过count来遍历
        pFeature = pFeatureCursor.NextFeature();
    count++;    //每执行一次操作，增加一次count
}

实现的代码可能不是最好的，是自己写的，要是数据很乱，就连最大的也是重复的，那就比较乱了，可以先试着下面的，将小的尽量删光，然后在用上面的将重复的删光！

---------------------------------------------------------------------------------------------------------

╔════════╗
╠════╣第G5个 ╠══════════════════════════════════════════════════╣
╚════════╝

●·●实现：MapControl 与 PageLayoutControl 的交互：

在 MapControl 和 PageLayoutControl 中进行关联！

首先要认清一点，虽然 MapControl 和 PageLayoutControl 中都有 ActiveView 属性，但是同样的属性在两者中表示的含义不同，在 MapControl 中，ActiveView 与 FocusMap 基本是同样的含义，是针对当前地图的；而 PageLayoutControl 中，ActiveView 指的是当前的布局图，并非 FocusMap，所以对于 MapControl 与 PageLayoutControl 之间的关联要用到 PageLayoutControl 中的 FocusMap，而非 ActiveView，对于 MapControl 则无所谓。它们之间的不同，可以通过显示其 Width 属性来实现，如下所示：

private void button2_Click(object sender, EventArgs e)
{
    label1.Text = axPageLayoutControl1.ActiveView.Extent.Width.ToString();
    IActiveView pActiveView = axPageLayoutControl1.ActiveView.FocusMap as IActiveView;
    label2.Text = pActiveView.Extent.Width.ToString();
}

private void button3_Click(object sender, EventArgs e)
{
    label3.Text = axMapControl1.ActiveView.Extent.Width.ToString();
    label4.Text = (axMapControl1.ActiveView.FocusMap as IActiveView).Extent.Width.ToString();
}

显示如下：

由此可见，PageLayoutControl 的 ActiveView 是独树一帜的！

//当地图替换的时候触发

        private void axMapControl1_OnMapReplaced(object sender, IMapControlEvents2_OnMapReplacedEvent e)
        {
            IObjectCopy pObjectCopy = new ObjectCopy();
            object copyMap = axMapControl1.Map;
            object overWriteMap = axPageLayoutControl1.ActiveView.FocusMap;
            pObjectCopy.Overwrite(copyMap, ref overWriteMap);
        }

//当布局的地图发生变化的时候触发，将 axPageLayoutControl 中地图的范围传递给 axMapControl

        private void axPageLayoutControl1_OnAfterScreenDraw(object sender, IPageLayoutControlEvents_OnAfterScreenDrawEvent e)
        {
            IActiveView activeView = axPageLayoutControl1.ActiveView.FocusMap as IActiveView;
            IDisplayTransformation displayTransformation = activeView.ScreenDisplay.DisplayTransformation;
            axMapControl1.Extent = displayTransformation.VisibleBounds;
            axMapControl1.ActiveView.Refresh();
        }

//当地图控件的范围发生变化时，将 axMapControl 中地图的范围传递给axPageLayoutControl

        private void axMapControl1_OnAfterDraw(object sender, IMapControlEvents2_OnAfterDrawEvent e)
        {
            IActiveView activeView = axPageLayoutControl1.ActiveView.FocusMap as IActiveView;
            IDisplayTransformation displayTransformation = activeView.ScreenDisplay.DisplayTransformation;
            displayTransformation.VisibleBounds = axMapControl1.Extent;
            axPageLayoutControl1.ActiveView.Refresh();
        }

另外，在 PageLayoutControl 中要想操作地图，还是要用到地图中的放大、缩小等工具，而要操作 PageLayoutControl 的框架时，则要用 PageLayout 的放大、缩小等工具！

---------------------------------------------------------------------------------------------------------

╔════════╗
╠════╣第G6个 ╠══════════════════════════════════════════════════╣
╚════════╝

●·●实现：制作可以浮动的工具栏：

第一步：导入一个类文件包，如下所示：

文件包下载>>>点击下载<<<

• 在 项目 上右键选择 新建项》文件夹，命名为“rpaulo”，貌似是作者的名字！
• 再在 此文件夹 下添加另外一个文件夹，命名为“toolbar”。
• 然后 通过 添加》现有项，导航到文件夹中的 *.cs 和 *.resx 文件，将其全部倒入。

第二步：可以写代码了：

using rpaulo.toolbar;            //添加引用

ToolBarManager _toolBarManager;
_toolBarManager = new ToolBarManager(this, this);         //新建工具管理

// The control Text property is used to draw the bar name while floating
// and on view/hide menu.
_toolBar1.Text = "Bar #1";
_toolBar2.Text = "Bar #2";
_toolBar3.Text = "Bar #3";
_toolBar4.Text = "Bar #4";

// Add toolbar (default position)
_toolBarManager.AddControl(_toolBar1);
// Add toolbar (floating)
_toolBarManager.AddControl(_toolBar2, DockStyle.None);
// Add toolbar (left)
_toolBarManager.AddControl(_toolBar3, DockStyle.Left);
// Add toolbar (left, on the left of _toolBar3)
_toolBarManager.AddControl(_toolBar4, DockStyle.Left, _toolBar3, DockStyle.Left);
// Add control
ToolBarDockHolder holder = _toolBarManager.AddControl(_dateTimePicker, DockStyle.Bottom); 
// Added by mav
holder.ToolbarTitle = "Appointment";
holder.AllowedBorders = AllowedBorders.Top|AllowedBorders.Bottom;
_toolBarManager.AddControl(toolBar1, DockStyle.Right);

• 可以将所有的控件都加进去，都可以实现浮动的效果，但是 toolbar 可以根据“左右上下”进行调整，移动到左右的时候自动变成垂直工具条！
• 可能默认的情况没有 ToolBar 控件，可以在 工具箱 上点击右键，选择 选择项，找到后，选中即可使用了！

效果图：

最重要的是那些代码了，调用其实很容易的！

---------------------------------------------------------------------------------------------------------

╔════════╗
╠════╣第G7个 ╠══════════════════════════════════════════════════╣
╚════════╝

●·●实现：ArcGIS Engine 实现鹰眼 & 分析：

主要用到两个 MapControl 的事件：

　　1> OnExtentUpdated：实现地图范围变化时触发。

　　2> OnMouseDown：鼠标单击的时候触发。

第一步：实现 TrackRectangle 方法，通过拖拽矩形来放大地图。

        private void axMapControl1_OnMouseDown(object sender, IMapControlEvents2_OnMouseDownEvent e)
        {
            IEnvelope pEnv = axMapControl1.TrackRectangle();
            axMapControl1.Extent = pEnv;   
        }

第二步：实现信息从 MapControl1 传递到 MapControl2 中。

        private void axMapControl1_OnExtentUpdated(object sender, IMapControlEvents2_OnExtentUpdatedEvent e)
        {
　　　　//实现鹰眼的方框的 symbol 部分
            ILineSymbol outLineSymbol = new SimpleLineSymbol();　　//设置鹰眼图中的红线！
            outLineSymbol.Width = 2;
            outLineSymbol.Color = GetColor(255, 0, 0, 255);

            IFillSymbol fillSymbol = new SimpleFillSymbol();　　//设置填充符号的属性！
            fillSymbol.Color = GetColor(255, 0, 0, 0);  　　//设置完全透明色
            fillSymbol.Outline = outLineSymbol;

　　　　//实现信息传递
            IEnvelope envlope2 = e.newEnvelope as IEnvelope;　　//定义新的信封范围，赋值为拖拽的矩形，或是extent
            IElement element2 = new RectangleElement();　　//定义一个要素，用在后面放在容器中显示应眼框
            element2.Geometry = envlope2;　　//给矩形要素赋值上面的信封范围

            IFillShapeElement fillShapeElement2 = element2 as IFillShapeElement;　　//具有 symbol 属性！
            fillShapeElement2.Symbol = fillSymbol;　　//赋值上面定义的 symbol

            IGraphicsContainer graphicsContainer2 = axMapControl2.Map as IGraphicsContainer;　　//定义存储图形的容器
            graphicsContainer2.DeleteAllElements();　　　　　　　　　　　　//首先删除当前的全部图形，也就是上一次的鹰眼框
            pElement = fillShapeElement2 as IElement;　　//将 fillShapeElement2 在转为 IElement，以为后面方法只能用这个类型！           
            graphicsContainer2.AddElement(pElement, 0);　　//增加新的鹰眼框       
            axMapControl2.Refresh(esriViewDrawPhase.esriViewGeography, null, null);　　//刷新 MapControl2 
        }

 private IRgbColor GetColor(int r, int g, int b, int t)　　//定义获取颜色的函数
 {
 IRgbColor rgbColor = new RgbColor();
 rgbColor.Red = r;
 rgbColor.Green = g;
 rgbColor.Blue = b;
 rgbColor.Transparency = (byte)t;　　//透明度
 return rgbColor;
 }

第三步：实现点击 MapControl2 响应鹰眼框的移动。

        private void axMapControl2_OnMouseDown(object sender, IMapControlEvents2_OnMouseDownEvent e)
        {
            IPoint point = new ESRI.ArcGIS.Geometry.Point();　　//定义地理点
            point.PutCoords(e.mapX, e.mapY);　　　　//获取点击的地理点
            axMapControl1.CenterAt(point);　　
        }

效果显示：

-------------------------------------------------------------------------------------------------------

╔════════╗
╠════╣第G8个 ╠══════════════════════════════════════════════════╣
╚════════╝

●·●实现：独立窗口的鹰眼显示：

№1：建立独立显示的窗体 Overview，在窗体中加入一个 MapControl 控件！

注意：将 axMapControl1 的 modifier 设置为 public，这样在主窗体中才可以调用！

public partial class Overview : Form
{
    IMapControl4 m_mapControl;　　//建立用于显示主窗体 MapControl 的实例！
    IMap m_map;
    public Overview(IHookHelper hook)　　//添加参数，用于与主窗体中 MapControl 相关联！
    {
        InitializeComponent();
        m_mapControl = hook.Hook as IMapControl4;　　//从 hook 中获取主窗体的 MapControl！
        m_map = m_mapControl.Map;
    }

    private void Overview_Load(object sender, EventArgs e)
    {
        for (int i = m_map.LayerCount - 1; i >= 0;i-- )
        {
            axMapControl1.AddLayer(m_mapControl.get_Layer(i));
        }
        axMapControl1.Extent = m_mapControl.FullExtent;
    }

    private void axMapControl1_OnMouseDown(object sender, IMapControlEvents2_OnMouseDownEvent e)
    {
        IPoint centerPoint = new ESRI.ArcGIS.Geometry.Point();
        centerPoint.PutCoords(e.mapX, e.mapY);
        m_mapControl.CenterAt(centerPoint);
    }
}

№2：在主窗体中写入交互内容！

private Overview pOverview2;　　//实例化一个鹰眼窗口

private void button2_Click(object sender, EventArgs e)
{
    HookHelper hookHelper = new HookHelper();　　//新建 HookHelper 的实例！
    hookHelper.Hook = axMapControl2.Object;　　//将主窗体的 axMapControl1 赋值给其属性 Hook，实现关联！
    pOverview2 = new Overview(hookHelper);　　//实例化一个鹰眼窗体，并将 hookHelper 传递过去！
    pOverview2.Show();　　//窗体显示！
}

private void axMapControl2_OnExtentUpdated(object sender, IMapControlEvents2_OnExtentUpdatedEvent e)
{
    IEnvelope pEnv = e.newEnvelope as IEnvelope;　　//获取矩形
    IGraphicsContainer pGraphicsContainer = pOverview2.axMapControl1.Map as IGraphicsContainer;　　//在鹰眼窗体上建立容器
    IActiveView pActiveView = pGraphicsContainer as IActiveView;　　//用于刷新的
    pGraphicsContainer.DeleteAllElements();　　//删除所有图形

    ISimpleLineSymbol pSimpleLineSymbol = new SimpleLineSymbol();　　//新建线状样式
    IRgbColor pColor = new RgbColor();
    pColor.Red = 255;
    pSimpleLineSymbol.Width = 1;
    pSimpleLineSymbol.Color = pColor;

    ISimpleFillSymbol pSimpleFillSymbol = new SimpleFillSymbol();　　//新建填充样式
    IRgbColor pColor2 = new RgbColor();
    pColor2.Transparency = 0;
    pSimpleFillSymbol.Color = pColor2;
    pSimpleFillSymbol.Outline = pSimpleLineSymbol;

    IElement pElement = new RectangleElement();　　//新建元素，用于后面添加到地图上面的
    pElement.Geometry = pEnv;　　//给元素赋予几何（矩形）属性，因为不具有 Symbol 属性，所以还要 QI 一下

    IFillShapeElement pFillShapeElement = pElement as IFillShapeElement;　　//用于赋予 symbol 的内容
    pFillShapeElement.Symbol = pSimpleFillSymbol;  
 
    pElement = pFillShapeElement as IElement;　　//后面方法中只能用 IElement，所以在转回来！

    pGraphicsContainer.AddElement(pElement,0);　　//添加元素，实现鹰眼效果 

    pActiveView.PartialRefresh(esriViewDrawPhase.esriViewGraphics, null, null);　　//刷新，这是刷新的鹰眼窗体！
}

效果如下图所示：

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●·●实现：自定义工具窗口：

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●·●ICustomizeDialog 接口：

　　Members

Description

	CloseDialog	Closes the customize dialog.
	CommandsCategory	The GUID of the component category used for commands.
	DialogTitle	The title of the customize dialog.
	DoubleClickDestination	The ToolbarControl commands are added to when double clicked.
	IsDialogActive	Indicates if the customize dialog is active on the screen.
	MenusCategory	The GUID of the component category used for menu definitions.
	SetDoubleClickDestination	Sets the ToolbarControl commands are added to when double clicked.
	ShowAddFromFile	Indicates if the 'Add From File' button is available on the customize dialog.
	StartDialog	Starts the modeless customize dialog.
	ToolbarsCategory	The GUID of the component category used for toolbar definitions.

---------------------------------------------------------------------------------------------------------

●·●ICustomizeDialogEvents 接口：

　　Members

Description

	OnCloseDialog	Fires when customize dialog is closed or exited.
	OnStartDialog	Fires when customize dialog is displayed on screen.

---------------------------------------------------------------------------------------------------------

首先：定义窗口实例和委托实例！对于 ArcObjects 来说属性方法放在一个接口中，事件放在另外一个接口中！

ICustomizeDialog m_CustomizeDialog = new CustomizeDialogClass();     //自定义对话框实例
ICustomizeDialogEvents_OnStartDialogEventHandler startDialogE;           //开始对话框委托，通过事件可以找到需要事件的委托类型！
ICustomizeDialogEvents_OnCloseDialogEventHandler closeDialogE;　　  //关闭对话框委托

其次：定义函数！

private void OnStartDialogHandler()
{
    basicToolbarControl.Customize = true;       //工具条控件允许自定义工具
}
private void OnCloseDialogHandler()
{     
    basicToolbarControl.Customize = false; 　　//工具条控件不允许自定义工具
    chkCustomize.Checked = false;　　　　　　//将复选框的√去掉
}

最后：实现事件！在 Form_Load 中写的！

// Set the customize dialog box events.
ICustomizeDialogEvents_Event pCustomizeDialogEvent = m_CustomizeDialog as ICustomizeDialogEvents_Event;　　//ICustomizeDialog 不具有事件，所以要查询到有事件的接口
startDialogE = new ICustomizeDialogEvents_OnStartDialogEventHandler(OnStartDialogHandler);　　//实例化开始委托
pCustomizeDialogEvent.OnStartDialog += startDialogE;　　//用开始委托实现开始事件
closeDialogE = new ICustomizeDialogEvents_OnCloseDialogEventHandler(OnCloseDialogHandler);　　//实例化关闭委托
pCustomizeDialogEvent.OnCloseDialog += closeDialogE;　　//用关闭委托实现关闭事件
// Set the title.
m_CustomizeDialog.DialogTitle = "定制工具条";　　//标题！
// Set the ToolbarControl that new items will be added to.
m_CustomizeDialog.SetDoubleClickDestination(basicToolbarControl);　　//双击工具加到工具条控件中！

另外是与复选框的交互！

private void chkCustomize_CheckedChanged(object sender, EventArgs e)
{
    if (chkCustomize.Checked == false)
    {
        m_CustomizeDialog.CloseDialog();　　//关闭自定义对话框
    }
    else
    {
        m_CustomizeDialog.StartDialog(basicToolbarControl.hWnd);　　//弹出自定义对话框
    }
}

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●·●实现：Map 与 PageLayout 切换后工具不变：

实现在切换前后，对于Map的工具恢复到之前的工具，而PageLayoutControl也是一样的！

ITool pMapTool = null;　　//定义存储map的工具
ITool pPageLayoutTool = null;　　//定义存储pagelayout的工具
private void tabControl1_SelectedIndexChanged(object sender, EventArgs e)
{
    if (tabControl1.SelectedIndex == 0)
    {
        if (axPageLayoutControl1.CurrentTool != null)　　//如果有工具则赋值，在没有转换buddy之前
            pPageLayoutTool = axPageLayoutControl1.CurrentTool;

        axToolbarControl1.SetBuddyControl(axMapControl1);

        if (axMapControl1.CurrentTool == null)　　//理论上讲默认都是null，然后给其赋值刚才的工具！
            axMapControl1.CurrentTool = pMapTool;
    }
    else
    {
        if (axMapControl1.CurrentTool != null)
            pMapTool = axMapControl1.CurrentTool;

        axToolbarControl1.SetBuddyControl(axPageLayoutControl1);

        if (axPageLayoutControl1.CurrentTool == null)
            axPageLayoutControl1.CurrentTool = pPageLayoutTool;
    }
}

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●·●实现：在窗体中显示渐变颜色 & 通过名称找控件：

实现效果：

实现代码如下：

private void button1_Click(object sender, EventArgs e)
{
    IAlgorithmicColorRamp algColorRamp = new AlgorithmicColorRampClass();
    IRgbColor startColor = new RgbColor();
    startColor.Red = 255;
    IRgbColor endColor = new RgbColor();
    endColor.Green = 255;

    algColorRamp.FromColor = startColor;
    algColorRamp.ToColor = endColor;
    algColorRamp.Algorithm = esriColorRampAlgorithm.esriCIELabAlgorithm;
    algColorRamp.Size = 32;

    bool bture = true;
    algColorRamp.CreateRamp(out bture);

    IEnumColors pEnumColors = algColorRamp.Colors;

    for (int i = 1; i <= 32;i++ )
    {
        object o;
        PictureBox pb;

        o=this.GetType().GetField("pictureBox" + i.ToString(), 
            BindingFlags.Instance | BindingFlags.NonPublic).GetValue(this);　　//通过控件名称来找控件的方法

if (o != null)
        {
            pb = (PictureBox)o;
            pb.BackColor = ColorTranslator.FromOle(pEnumColors.Next().RGB);
        }
    }
}

自己定义 pictureBox，实现如下：

for (int i = 1; i <= 50;i++ )
{
    PictureBox pb = new PictureBox();
    pb.Height = 10;
    pb.Width = 500;
    pb.Location = new System.Drawing.Point(10, i * 12);
    panel1.Controls.Add(pb);
    pb.BackColor = ColorTranslator.FromOle(pEnumColors.Next().RGB);
}

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●·●实现：获取地图是否处于编辑状态：

引言：在操作地图的时候，可能某人设置了，左键可以实现拉框放大，中键和右键怎可以实现漫游，但是若是这样设置，当图层处于编辑状态的时候就糟糕了！因为操作会重叠，这个时候就需要判断图层是否处于编辑状态，只有处于非编辑状态的时候才要执行上面的方法！

IFeatureLayer pFeatureLayer = axMapControl1.Map.get_Layer(0) as IFeatureLayer;　　//获取 IFeatureLayer
IDataset pDataset =(IDataset) pFeatureLayer.FeatureClass;　　　　　　　　　　//获取 IDataset
IWorkspaceEdit pWorkspaceEdit = (IWorkspaceEdit) pDataset.Workspace;　　//获取 IWorkspaceEdit
if (pWorkspaceEdit.IsBeingEdited())
{
　　//可以编辑状态
}

●·●IDataset 接口：

●·●IWorkspaceEdit 接口：

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╠════╣第U4个 ╠══════════════════════════════════════════════════╣
╚════════╝

●·●实现：获取地图是否处于编辑状态：

引言：在操作地图的时候，可能某人设置了，左键可以实现拉框

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╔════════╗
╠════╣第U5个 ╠══════════════════════════════════════════════════╣
╚════════╝

●·●实现：获取地图是否处于编辑状态：

引言：在操作地图的时候，可能某人设置了，左键可以实现拉框