AE二次开发中几个功能速成归纳（符号设计器、创建要素、图形编辑、属性表编辑、缓冲区分析）

/*
 * 实习课上讲进阶功能所用文档，因为赶时间从网上抄抄改改，凑合能用，记录一下以备个人后用。
 *
 * -------------------------------------------------------------------
 *
 * 使用前提：已搭建好AE的GIS基本框架，包括TOC、mapcontrol、toolbar拖控件，mxd、shp文件载入显示，查看图层属性表等
 *
 * -------------------------------------------------------------------
 */
/* Form1中的using */

using System;

using System.Windows.Forms;

using ESRI.ArcGIS.Carto;

using ESRI.ArcGIS.Controls;

using ESRI.ArcGIS.Display;

using ESRI.ArcGIS.Geometry;

using ESRI.ArcGIS.Geodatabase;

using ESRI.ArcGIS.SystemUI;

using ESRI.ArcGIS.esriSystem;

using System.Drawing;

using System.Runtime.InteropServices;

using ESRI.ArcGIS.DataSourcesFile;

using System.Collections;

/*
 * 一、符号设计
 *
 * 在TOC的doubleclick事件中写入：
 */

esriTOCControlItem toccItem = esriTOCControlItem.esriTOCControlItemNone;

ILayer iLayer = null;

IBasicMap iBasicMap = null;

object unk = null;

object data = null;

axTOCControl1.HitTest( e.x, e.y, ref toccItem, ref iBasicMap, ref iLayer, ref unk, ref data ); /* 获取所点击图例及其图层 */

if ( e.button ==  )

{
    if ( toccItem == esriTOCControlItem.esriTOCControlItemLegendClass )

    {
        ILegendClass pLC = new LegendClassClass();

        pLC = ( (ILegendGroup) unk).get_Class( (int) data ); /* 获取图例 */

        ISymbol pSym = pLC.Symbol; /* 获取图例的符号 */

        ESRI.ArcGIS.DisplayUI.ISymbolSelector pSS = new ESRI.ArcGIS.DisplayUI.SymbolSelectorClass(); /* 创建符号选择器 */

        bool a = false;

        pSS.AddSymbol( pSym );

        a = pSS.SelectSymbol(  ); /* 打开符号选择器 */

        if ( a )

        {
            pLC.Symbol = pSS.GetSymbolAt(  );
        }

        this.axMapControl1.ActiveView.Refresh();

        this.axTOCControl1.Refresh();
    }
}

/*
 * 二、创建要素
 *
 * 1.创建并添加shp新图层
 */

/* 点shp的创建并添加 */

private void 点ToolStripMenuItem_Click( object sender, EventArgs e )

{
    string pointshppath = "";

    SaveFileDialog spointdlg = new SaveFileDialog(); /* 打开保存文件对话框，设置保存路径和shp文件名 */

    if ( spointdlg.ShowDialog() == DialogResult.OK )

    {
        pointshppath = spointdlg.FileName;
    }else {
        return;
    }

/* 准备好要素类空对象 */

    IFeatureClass m_pointfeatureclass = null;

/* 从文件路径中分解出文件夹路径和文件名称 */

    int count = pointshppath.LastIndexOf ("\");

string folder = pointshppath.Substring(, count);

string name = pointshppath.Substring(count + , pointshppath.Length - count - );

//根据文件夹路径创建工作空间工厂和工作空间

IWorkspace ipws;

IWorkspaceFactory ipwsf = new ShapefileWorkspaceFactoryClass();

ipws = ipwsf.OpenFromFile(folder, );

//转为要素工作空间

IFeatureWorkspace ifeatws;

ifeatws = ipws as IFeatureWorkspace;

//对shp文件的一些必要设置，除了红字部分外都不用改

IFields pFields = new FieldsClass();

IField pField = new FieldClass();

IFieldsEdit pFieldsEdit = pFields as IFieldsEdit;

IFieldEdit pFieldEdit = pField as IFieldEdit;

IGeometryDef ipGeodef = new GeometryDefClass();

IGeometryDefEdit ipGeodefEdit = ipGeodef as IGeometryDefEdit;

ISpatialReference ipSpatialRef;

IUnknownCoordinateSystem iunknowncoord = new UnknownCoordinateSystemClass();

ipSpatialRef = iunknowncoord;

ipGeodefEdit.GeometryType_2 = esriGeometryType.esriGeometryPoint;//确定你要生成的shp的几何类型（点线面）

ipSpatialRef.SetMDomain(-, );

ipGeodefEdit.HasM_2 = false;

ipGeodefEdit.HasZ_2 = false;

ipGeodefEdit.SpatialReference_2 = ipSpatialRef;

pFieldEdit.Name_2 = "Shape ";

pFieldEdit.Type_2 = esriFieldType.esriFieldTypeGeometry;

pFieldEdit.GeometryDef_2 = ipGeodef;

pFieldsEdit.AddField(pField);

//////////////////////////////////////////

//创建要素类并导出shp文件于预设文件路径

m_pointfeatureclass = ifeatws.CreateFeatureClass(name, pFields, null, null, esriFeatureType.esriFTSimple, "Shape ", " ");

//加载新创建的shp文件并调到图层显示顺序的最顶层

axMapControl1.AddShapeFile(folder,name);

axMapControl1.MoveLayerTo(, axMapControl1.LayerCount - );

return;

}

//线shp的创建并添加

private void 线ToolStripMenuItem_Click(object sender, EventArgs e)

{

string lineshppath = " ";

SaveFileDialog slinedlg = new SaveFileDialog();//打开保存文件对话框，设置保存路径和shp文件名

if (slinedlg.ShowDialog() == DialogResult.OK)

{

lineshppath = slinedlg.FileName;

}

else

{

return;

}

//准备好要素类空对象

IFeatureClass m_linefeatureclass = null;

//从文件路径中分解出文件夹路径和文件名称

int count = lineshppath.LastIndexOf(" \ ");

string folder = lineshppath.Substring(, count);

string name = lineshppath.Substring(count + , lineshppath.Length - count - );

//根据文件夹路径创建工作空间工厂和工作空间

IWorkspace ipws;

IWorkspaceFactory ipwsf = new ShapefileWorkspaceFactoryClass();

ipws = ipwsf.OpenFromFile(folder, );

//转为要素工作空间

IFeatureWorkspace ifeatws;

ifeatws = ipws as IFeatureWorkspace;

//对shp文件的一些必要设置，除了红字部分外都不用改

IFields pFields = new FieldsClass();

IField pField = new FieldClass();

IFieldsEdit pFieldsEdit = pFields as IFieldsEdit;

IFieldEdit pFieldEdit = pField as IFieldEdit;

IGeometryDef ipGeodef = new GeometryDefClass();

IGeometryDefEdit ipGeodefEdit = ipGeodef as IGeometryDefEdit;

ISpatialReference ipSpatialRef;

IUnknownCoordinateSystem iunknowncoord = new UnknownCoordinateSystemClass();

ipSpatialRef = iunknowncoord;

ipGeodefEdit.GeometryType_2 = esriGeometryType.esriGeometryPolyline;//确定你要生成的shp的几何类型（点线面）

ipSpatialRef.SetMDomain(-, );

ipGeodefEdit.HasM_2 = false;

ipGeodefEdit.HasZ_2 = false;

ipGeodefEdit.SpatialReference_2 = ipSpatialRef;

pFieldEdit.Name_2 = "Shape ";

pFieldEdit.Type_2 = esriFieldType.esriFieldTypeGeometry;

pFieldEdit.GeometryDef_2 = ipGeodef;

pFieldsEdit.AddField(pField);

//////////////////////////////////////////

//创建要素类并导出shp文件于预设文件路径

m_linefeatureclass = ifeatws.CreateFeatureClass(name, pFields, null, null, esriFeatureType.esriFTSimple, "Shape ", " ");

//加载新创建的shp文件并调到图层显示顺序的最顶层

axMapControl1.AddShapeFile(folder,name);

axMapControl1.MoveLayerTo(, axMapControl1.LayerCount - );

return;

}

//面shp的创建并添加

private void 面ToolStripMenuItem_Click(object sender, EventArgs e)

{

string polygonshppath = " ";

SaveFileDialog spolygondlg = new SaveFileDialog();//打开保存文件对话框，设置保存路径和shp文件名

if (spolygondlg.ShowDialog() == DialogResult.OK)

{

polygonshppath = spolygondlg.FileName;

}

else

{

return;

}

//准备好要素类空对象

IFeatureClass m_polygonfeatureclass = null;

//从文件路径中分解出文件夹路径和文件名称

int count = polygonshppath.LastIndexOf(" \ ");

string folder = polygonshppath.Substring(, count);

string name = polygonshppath.Substring(count + , polygonshppath.Length - count - );

//根据文件夹路径创建工作空间工厂和工作空间

IWorkspace ipws;

IWorkspaceFactory ipwsf = new ShapefileWorkspaceFactoryClass();

ipws = ipwsf.OpenFromFile(folder, );

//转为要素工作空间

IFeatureWorkspace ifeatws;

ifeatws = ipws as IFeatureWorkspace;

//对shp文件的一些必要设置，除了红字部分外都不用改

IFields pFields = new FieldsClass();

IField pField = new FieldClass();

IFieldsEdit pFieldsEdit = pFields as IFieldsEdit;

IFieldEdit pFieldEdit = pField as IFieldEdit;

IGeometryDef ipGeodef = new GeometryDefClass();

IGeometryDefEdit ipGeodefEdit = ipGeodef as IGeometryDefEdit;

ISpatialReference ipSpatialRef;

IUnknownCoordinateSystem iunknowncoord = new UnknownCoordinateSystemClass();

ipSpatialRef = iunknowncoord;

ipGeodefEdit.GeometryType_2 = esriGeometryType.esriGeometryPolygon;//确定你要生成的shp的几何类型（点线面）

ipSpatialRef.SetMDomain(-, );

ipGeodefEdit.HasM_2 = false;

ipGeodefEdit.HasZ_2 = false;

ipGeodefEdit.SpatialReference_2 = ipSpatialRef;

pFieldEdit.Name_2 = "Shape ";

pFieldEdit.Type_2 = esriFieldType.esriFieldTypeGeometry;

pFieldEdit.GeometryDef_2 = ipGeodef;

pFieldsEdit.AddField(pField);

//////////////////////////////////////////

//创建要素类并导出shp文件于预设文件路径

m_polygonfeatureclass = ifeatws.CreateFeatureClass(name, pFields, null, null, esriFeatureType.esriFTSimple, "Shape ", " ");

//加载新创建的shp文件并调到图层显示顺序的最顶层

axMapControl1.AddShapeFile(folder,name);

axMapControl1.MoveLayerTo(, axMapControl1.LayerCount - );

return;

}

/*
2.在shp中绘制点线面要素并储存

课上只提到调用Toolbar里的工具：

使用流程：

开始编辑——>选择目标图层——>开启草图工具——>绘制新图形——>保存并停止编辑

而写代码方式的主要思路如下（没做撤销和双缓冲）：
*/
//获取MapControl中的全部图层名称，并加入ComboBox

 //图层

 toolStripComboBox1.Visible = true;

 ILayer pLayer;

 //图层名称

 string strLayerName;

 for (int i = ; i < this.axMapControl1.LayerCount; i++)

            {

                pLayer = this.axMapControl1.get_Layer(i);

                strLayerName = pLayer.Name;

                //图层名称加入ComboBox

                this.toolStripComboBox1.Items.Add(strLayerName);

            }

            //默认显示第一个选项

            this.toolStripComboBox1.SelectedIndex = ;

//用三个int成员变量drawpoint、drawline、drawregion指示添加的是点、线还是面

//用三个IFeatureClass成员变量startpointshp、startlineshp、startpolygonshp来取出所选图层的要素类

//用一个点集数列IPointArray pts存储画线、面时连续产生的节点

//当combobox中选项变化时判断所选图层的要素类的几何类型并取出

IFeatureLayer layer = axMapControl1.get_Layer(this.toolStripComboBox1.SelectedIndex) as IFeatureLayer;

            if (layer.FeatureClass.ShapeType == esriGeometryType.esriGeometryPoint)

            {

                startpointshp = layer.FeatureClass;

                drawpoint = ;

                drawline = ;

                drawregion = ;

            }

            if (layer.FeatureClass.ShapeType == esriGeometryType.esriGeometryPolyline)

            {

                startlineshp = layer.FeatureClass;

                drawpoint = ;

                drawline = ;

                drawregion = ;

            }

            if (layer.FeatureClass.ShapeType == esriGeometryType.esriGeometryPolygon)

            {

                startpolygonshp = layer.FeatureClass;

                drawpoint = ;

                drawline = ;

                drawregion = ;

            }
//在onmousedown（onmouseup也行）中进行判断并创建新要素图形
if (e.button ==  &&drawline == &&drawpoint== && drawregion==)

            {

                m_menuMap.PopupMenu(e.x, e.y, m_mapControl.hWnd);//没开启添加要素功能，则正常弹菜单项

            }

            if (e.button ==  && drawpoint == )

            {

IPoint pt;

                pt = axMapControl1.ToMapPoint(e.x, e.y);

                IFeature pFeature = startpointshp.CreateFeature();

                pFeature.Shape = pt;

                pFeature.Store();

                this.axMapControl1.ActiveView.Refresh();

                return;

            }

            if (e.button ==  && drawline == )//左键创建线的节点

            {

                IPoint pt;

                pt = axMapControl1.ToMapPoint(e.x, e.y);

                pts.Add(pt);

                return;

            }

            if (e.button ==  && drawline == )//右键根据节点创建线

            {

                ESRI.ArcGIS.Geometry.IPolyline ipPolyline = new PolylineClass();

                ESRI.ArcGIS.Geometry.IPointCollection ipPointCol = (IPointCollection)ipPolyline;

                object missing = Type.Missing;

                for (int i = ; i < pts.Count; i++)

                {

                    object t = pts.get_Element(i);

                    ESRI.ArcGIS.Geometry.Point p = (ESRI.ArcGIS.Geometry.Point)t;

                    if (p != null)

                    {

                        ipPointCol.AddPoint(p, ref missing, ref missing);

                    }

                }

                IPolyline polyline = ipPolyline;

                IFeature pFeature = startlineshp.CreateFeature();

                pFeature.Shape = polyline;

                pFeature.Store();

                this.axMapControl1.ActiveView.Refresh();

                pts.RemoveAll();

                return;

            }

            if (e.button ==  && drawregion == )//左键创建面的节点

            {

                IPoint pt;

                pt = axMapControl1.ToMapPoint(e.x, e.y);

                pts.Add(pt);

                return;

            }

            if (e.button ==  && drawregion == )//右键根据节点创建面

            {

                ESRI.ArcGIS.Geometry.IPolygon ipPolyGon = new PolygonClass();

                ESRI.ArcGIS.Geometry.IPointCollection ipPointCol = (IPointCollection)ipPolyGon;

                object missing = Type.Missing;

                for (int i = ; i < pts.Count; i++)

                {

                    object t = pts.get_Element(i);

                    ESRI.ArcGIS.Geometry.Point p = (ESRI.ArcGIS.Geometry.Point)t;

                    if (p != null)

                    {

                        ipPointCol.AddPoint(p, ref missing, ref missing);

                    }

                }

                ipPointCol.AddPoint(pts.get_Element(), ref missing, ref missing);//面的坐标串首尾坐标应一致（如P1-P2-P3-P4-P1）

                IPolygon polygon = ipPolyGon;

                IFeature pFeature = startpolygonshp.CreateFeature();

                pFeature.Shape = polygon;

                pFeature.Store();

                this.axMapControl1.ActiveView.Refresh();

                pts.RemoveAll();

                return;

            }

//结束创建时执行清理、重置

   drawpoint = ;

            drawline = ;

            drawregion = ;

            pts.RemoveAll();

            startpointshp = null;

            startlineshp = null;

            startpolygonshp = null;

            this.toolStripComboBox1.Visible = false;

            this.toolStripComboBox1.Items.Clear();

 /*

3.shp中点线面要素的图形编辑

使用Toolbar

使用流程：

开始编辑——>选择目标图层——>开启编辑工具——>图形编辑——>保存并停止编辑

三、属性表编辑

1.在属性表窗体设计中加一个按钮用于更新数据

2.属性表类中至少应有如下成员对象，在表开启后这些值应都已经赋值或初始化
  * */

public DataTable attributeTable;//你的表

string tableName;//你的表的名字

public List array = new List();//你用来记录哪些行的数据被改变了的数列

public ILayer currentlayer;//你用来获取当前图层的对象其中，比如，attributeTable和tableName可在Load函数中赋值，currentlayer可在构造函数中赋值

/*
3.添加如下函数
 */

//在按钮的点击事件中添加如下代码

private void button1_Click(object sender, EventArgs e)

{

if (array.Count < )//没有记录到任何数据可能改变的行

{

MessageBox.Show(" 未 修改任何数据 ！ ");

return;

}

array.Sort();

ILayer player = this.currentlayer;

UpdateFTOnDV(player, attributeTable, array.ToArray());

dataGridView1.EditMode = DataGridViewEditMode.EditProgrammatically;//dataGridView1是你属性表中显示数据的视图

dataGridView1.Refresh();

}

//在表的CellValueChanged事件中添加如下代码

private void dataGridView1_CellValueChanged(object sender, DataGridViewCellEventArgs e)

{

array.Add(e.RowIndex);//将有值改变的那个行的行号记录下来

}

//在属性表类中添加如下函数

public void UpdateFTOnDV(ILayer player, DataTable pdatatable, int[] array)

{

IFeatureLayer pFTClass = player as IFeatureLayer;

ITable pTable = pFTClass as ITable;

IRow pRow;

ICursor pCursor = pTable.GetRows(array, false);

for (int i = ; i < array.Length; i++)

{

pRow = pCursor.NextRow();

int k = array[i];

for (int j = ; j < pdatatable.Columns.Count; j++)

{

object pgridview = pdatatable.Rows[k][j];

object prow = pRow.get_Value(j);

if (prow.ToString() != pgridview.ToString())//当表格中值与shp文件属性表中值不同时发生替换

{

if (pgridview == System.DBNull.Value)

{

string skipinfo = "第 " + (k+).ToString() + "行第 " + (j+).ToString() + " 列 的数据 可 为 空 自动跳过修改 ";

MessageBox.Show(skipinfo);

continue;

}

pRow.set_Value(j, pgridview);

pRow.Store();

}

}

}

MessageBox.Show("数据保存 成 功 ！ ");

}

/*
四、空间分析

以缓冲区分析为例，实现对某类地物周边一定范围内其他地物的统计与显示。
 */

//buffer类中的using

using System;

using System.Windows.Forms;

using ESRI.ArcGIS.Carto;

using ESRI.ArcGIS.Controls;

using ESRI.ArcGIS.Geoprocessing;

using ESRI.ArcGIS.Geoprocessor;

using ESRI.ArcGIS.Geodatabase;

using ESRI.ArcGIS.AnalysisTools;

using System.Collections;
/*

1.创建一个windows窗体类buffer.cs

2.对窗体进行设计

目标地物（上面的）下拉框的Name设为comboBox2

被统计地物（下面的）下拉框Name设为comboBox3

分析距离textBox的Name设为textBox1

按钮Name设为button1

3.添加相关代码
*/
//1>Buffer类中添加三个成员

private static int counter = ;//用来对生成图层的计数

private AxMapControl axMapControl1;//用来获取主框架传进来的AxMapControl

private ArrayList flyr = new ArrayList();//用来存储生成的图层，便于结束分析后删除

//2>修改构造函数为

public buffer(AxMapControl mapControl)

{

InitializeComponent();

this.axMapControl1 = mapControl;

}

//3>在窗体设计布局中，双击Buffer的对话框，进入buffer_Load函数，添加以下代码

//MapControl中没有图层时返回

if (axMapControl1.LayerCount <= )

return;

ILayer pLayer;//图层

string strLayerName;//图层名称

//获取MapControl中的全部图层名称，并加入ComboBox

for (int i = ; i < axMapControl1.LayerCount; i++)

{

pLayer = axMapControl1.get_Layer(i);

strLayerName = pLayer.Name;

comboBox2.Items.Add(strLayerName);

comboBox3.Items.Add(strLayerName);

}

//默认显示第一个选项

comboBox2.SelectedIndex = ;

comboBox3.SelectedIndex = ;

//3>在窗体设计布局中，双击按钮，进入click事件，添加以下代码

//获取所设置的缓冲区距离

string distance = this.textBox1.Text.ToString();

//给距离加上单位，默认为米

string para = distance + " Meters ";

//根据所选图层确定其数据源位置，即shp文件所在的文件夹路径

IDataLayer combo2 = (IDataLayer)axMapControl1.get_Layer(comboBox2.SelectedIndex);

IWorkspaceName ws = ((IDatasetName)(combo2.DataSourceName)).WorkspaceName;

string featurefolder = ws.PathName;

//使用gp处理工具

Geoprocessor gp = new Geoprocessor();

//允许覆盖同名文件

gp.OverwriteOutput = true;

//调用缓冲区工具

ESRI.ArcGIS.AnalysisTools.Buffer buffertool = new ESRI.ArcGIS.AnalysisTools.Buffer();

//设置输入图层路径和输出图层路径

buffertool.in_features = featurefolder+ " \ " + comboBox2.SelectedItem + ".shp ";

buffertool.out_feature_class = featurefolder + " \ " + comboBox2.SelectedItem + "_buffer " + counter.ToString() + ".shp ";

//设置缓冲区相关参数

buffertool.buffer_distance_or_field = para;

buffertool.dissolve_option = "ALL ";

//执行

try

{ gp.Execute(buffertool, null); }

catch (Exception ex)

{

MessageBox.Show("ERROR ");

return;

}

//对生成图层的计数

counter++;

//用生成的缓冲区与被统计地物进行叠置分析求交集

Intersect pIntersect = new Intersect();

int chooselayer = counter - ;

Geoprocessor gp2 = new Geoprocessor();

gp2.OverwriteOutput = true;    //允许覆盖同名文件

FeatureLayer pFeatureLayer = new FeatureLayerClass();

//设置相关参数

object obj = gp2.GetEnvironmentValue("Extent ");

gp2.SetEnvironmentValue("Extent ", "MAXOF ");

obj = gp2.GetEnvironmentValue("OutputZFlag ");

gp2.SetEnvironmentValue("OutputZFlag ", "DEFAULT ");

obj = gp2.GetEnvironmentValue("OutputMFlag ");

gp2.SetEnvironmentValue("OutputMFlag ", "DEFAULT ");

obj = gp2.GetEnvironmentValue("QualifiedFieldNames ");

gp2.SetEnvironmentValue("QualifiedFieldNames ", "QUALIFIED ");

//把要求交的两个要素放到一个IGpValueTableObject中作为参数

IGpValueTableObject pObject = new GpValueTableObjectClass();

pObject.SetColumns();

object inputfeature = featurefolder + " \ " + comboBox3.SelectedItem + ".shp ";

pObject.AddRow(ref inputfeature);

object inputfeature2 = featurefolder + " \ " + comboBox2.SelectedItem + "_buffer " + chooselayer.ToString() + ".shp ";

pObject.AddRow(ref inputfeature2);

//设置输入图层路径和输出图层路径

pIntersect.in_features = pObject;

pIntersect.out_feature_class = featurefolder + " \ " + comboBox2.SelectedItem + "_insert " + chooselayer.ToString() + ".shp ";

pIntersect.join_attributes = "All ";

//执行

IGeoProcessorResult pResult = (IGeoProcessorResult)gp2.Execute(pIntersect, null);

//从求交的结果中提取Feature并做相关统计

IGPUtilities pGPUtil = new GPUtilitiesClass();

IFeatureClass pFC;

IQueryFilter pQF;

pGPUtil.DecodeFeatureLayer(pResult.GetOutput(), out pFC, out pQF);

int count = pFC.FeatureCount(null);

IFeatureCursor pCursor = pFC.Insert(true);

pFeatureLayer.FeatureClass = pFC;

//将缓冲区载入地图中显示

axMapControl1.AddShapeFile(featurefolder + " \ ", comboBox2.SelectedItem + "_buffer " + chooselayer.ToString() + ".shp ");

axMapControl1.MoveLayerTo(, axMapControl1.LayerCount - );

//获取生成的缓冲区对象

FeatureLayer bufferlayer = axMapControl1.get_Layer(axMapControl1.LayerCount - ) as FeatureLayer;

//将求交得到的对象载入地图中显示

pFeatureLayer.Name = comboBox2.SelectedItem + " 周边 " + textBox1.Text + "米内的 " + comboBox3.SelectedItem;

axMapControl1.Map.AddLayer(pFeatureLayer);

//将生成的缓冲区和求交对象放到一个图层数组中，在关闭缓冲区分析工具后统一移出系统

flyr.Add(bufferlayer);

flyr.Add(pFeatureLayer);

//将缓冲区分析的结果放到属性表中并显示

ILayer layer = pFeatureLayer as ILayer;

FrmAttribute attributeTable = new FrmAttribute(layer, axMapControl1);

attributeTable.Show();

//4>在窗体的FormClosing事件中，添加以下代码

//删除所有生成的缓冲区和求交对象

foreach (FeatureLayer pFeatureLayer in flyr)

{

IDataLayer2 OnOff = pFeatureLayer as IDataLayer2;

OnOff.Disconnect();

axMapControl1.Map.DeleteLayer(pFeatureLayer);

}
/*
4.在主窗体中调用此模块

首先在菜单栏中新建一个选项如“周边设施分析”

之后双击该选项，添加如下代码
*/
buffer b = new buffer(axMapControl1);

b.Show();
/*
五、esriAddIn扩展项在ArcEngine中的添加

对原代码中接口适当修改，使其可用于ArcEngine二次开发工程中

1.在服务中引用“AE开发用”文件夹中的MappingTools.dll

2.菜单栏中创建对应菜单，在单击事件中加入调用代码，并在Form1类的顶端填写using MappingTools;
*/

//调用创建直方图时，是在mapcontrol1的onmousedown事件中触发创建直方图的函数

//首先到onmousedown中加入如下代码

if (zhifangtu ==  && e.button==)//开启了直方图功能且在地图上单击了鼠标左键时

{

Createzft (e.x,e.y);

}

//之后在Form1主类中加入如下函数

Public void Createzft(int x,int y)

{

MappingTools.CreateGraph a = new MappingTools.CreateGraph();

frmGraph frm = new frmGraph(this.axMapControl1);

frm.BasePoint = axMapControl1.ActiveView.ScreenDisplay.DisplayTransformation.ToMapPoint(x, y);

DialogResult re = frm.ShowDialog();

}