（注意 在NET中，会遇到以“_2”结尾的属性，这些属性是可写的。）

//定义一个几何字段，类型为点类型

ISpatialReference pSpatialReference = axMapControl1.ActiveView.FocusMap.SpatialReference; IGeometryDefEdit pGeoDef = new GeometryDefClass(); IGeometryDefEdit pGeoDefEdit = pGeoDef as IGeometryDefEdit; pGeoDefEdit.GeometryType_2 = esriGeometryType.esriGeometryPoint; pGeoDefEdit.SpatialReference_2 = pSpatialReference;

//定义一个字段集合对象 IFields pFields = new FieldsClass();

IFieldsEdit pFieldsEdit = (IFieldsEdit)pFields; //定义单个的字段

IField pField = new FieldClass(); IFieldEdit pFieldEdit = (IFieldEdit)pField; pFieldEdit.Name_2 = \

pFieldEdit.Type_2 = esriFieldType.esriFieldTypeGeometry; pFieldsEdit.AddField(pField); pFieldEdit.GeometryDef_2 = pGeoDef; //定义单个的字段，并添加到字段集合中 pField = new FieldClass(); pFieldEdit = (IFieldEdit)pField; pFieldEdit.Name_2 = \

pFieldEdit.Type_2 = esriFieldType.esriFieldTypeString; pFieldsEdit.AddField(pField);

//定义单个的字段，并添加到字段集合中 pField = new FieldClass(); pFieldEdit = (IFieldEdit)pField; pFieldEdit.Name_2 = \

pFieldEdit.Type_2 = esriFieldType.esriFieldTypeString; pFieldsEdit.AddField(pField);

//定义单个的字段，并添加到字段集合中 pField = new FieldClass(); pFieldEdit = (IFieldEdit)pField; pFieldEdit.Name_2 = \

pFieldEdit.Type_2 = esriFieldType.esriFieldTypeString; pFieldsEdit.AddField(pField);

//定义单个的字段，并添加到字段集合中 pField = new FieldClass(); pFieldEdit = (IFieldEdit)pField; pFieldEdit.Name_2 = \

pFieldEdit.Type_2 = esriFieldType.esriFieldTypeString; pFieldsEdit.AddField(pField);

IWorkspaceFactory pFtWsFct = new AccessWorkspaceFactory();

IFeatureWorkspace pWs = pFtWsFct.OpenFromFile(@\， 0) as IFeatureWorkspace;

IFeatureClass pFtClass = pWs.CreateFeatureClass(\， pFields， null， null， esriFeatureType.esriFTSimple， \， null)——————//////?????????????

如何改变字段的别名？

public void ChangeFieldAliasName(ITable pTable， string pOriFieldName， string pDesFieldName) {

IClassSchemaEdit pClassSchemaEdit = (IClassSchemaEdit)pTable; //给对象加上锁

ISchemaLock pSchemaLock = (ISchemaLock)pTable;

pSchemaLock.ChangeSchemaLock(esriSchemaLock.esriExclusiveSchemaLock); if (pTable.FindField(pOriFieldName) != -1) {

pClassSchemaEdit.AlterFieldAliasName(pOriFieldName， pDesFieldName); pSchemaLock.ChangeSchemaLock(esriSchemaLock.esriSharedSchemaLock);

使用IFeatureSelection接口高亮显示

在介绍IMap接口那一节，我们用IMap的IMap.SelectFeature方法实现了对查询的要素高亮显示，现在我们用IFeatureSelection接口实现查询高亮显示

IMap pMap = axMapControl1.Map;

IFeatureLayer pFeaturelayer = GetLayer(pMap， \ IFeatureSelection pFeatureSelection = pFeaturelayer as IFeatureSelection; IQueryFilter pQuery = new QueryFilterClass(); pQuery.WhereClause = \

pFeatureSelection.SelectFeatures(pQuery，esriSelectionResultEnum.esriSelectionResultNew，false); axMapControl1.ActiveView.Refresh();

其中GetLayer函数是我们写的一个根据图层的名称获取图层的方法，代码如下

private ILayer GetLayer(IMap pMap， string LayerName) {

IEnumLayer pEnunLayer;

pEnunLayer = pMap.get_Layers(null， false); pEnunLayer.Reset(); ILayer pRetureLayer;

pRetureLayer = pEnunLayer.Next(); while (pRetureLayer != null) {

if (pRetureLayer.Name == LayerName) { break; }

pRetureLayer = pEnunLayer.Next(); }

return pRetureLayer; }

提问：以下三种方式的区别在哪里？

axMapControl1.Refresh(esriViewDrawPhase.esriViewGeoSelection, null, null); axMapControl1.ActiveView.Refresh(); axMapControl1.Refresh();

创建符合要求的表：

public ITable CreateTable(string _TablePath， string _TableName) {

IWorkspaceFactory pWks = new ShapefileWorkspaceFactoryClass();

IFeatureWorkspace pFwk = pWks.OpenFromFile(_TablePath， 0) as IFeatureWorkspace; //用于记录面中的ID;

IField pFieldID = new FieldClass();

IFieldEdit pFieldIID = pFieldID as IFieldEdit;

pFieldIID.Type_2 = esriFieldType.esriFieldTypeInteger; pFieldIID.Name_2 = \面ID\ //用于记录个数的;

IField pFieldCount = new FieldClass();

IFieldEdit pFieldICount = pFieldCount as IFieldEdit; pFieldICount.Type_2 = esriFieldType.esriFieldTypeInteger; pFieldICount.Name_2 = \个数\ //用于添加表中的必要字段

ESRI.ArcGIS.Geodatabase.IObjectClassDescription objectClassDescription = new ESRI.ArcGIS.Geodatabase.ObjectClassDescriptionClass(); IFields pTableFields = objectClassDescription.RequiredFields; IFieldsEdit pTableFieldsEdit = pTableFields as IFieldsEdit; pTableFieldsEdit.AddField(pFieldID); pTableFieldsEdit.AddField(pFieldCount);

ITable pTable = pFwk.CreateTable(_TableName， pTableFields， null， null， \ return pTable; }

统计需要的数据：

///

///

public void StatisticPointCount(IFeatureClass _pPolygonFClass， IFeatureClass _pPointFClass， ITable _pTable) {

IFeatureCursor pPolyCursor = _pPolygonFClass.Search(null， false); IFeature pPolyFeature = pPolyCursor.NextFeature();

while (pPolyFeature != null) {

IGeometry pPolGeo = pPolyFeature.Shape; int Count = 0;

ISpatialFilter spatialFilter = new SpatialFilterClass(); spatialFilter.Geometry = pPolGeo;

spatialFilter.SpatialRel = esriSpatialRelEnum.esriSpatialRelContains; IFeatureCursor pPointCur = _pPointFClass.Search(spatialFilter， false); if (pPointCur != null) {

IFeature pPointFeature = pPointCur.NextFeature(); while (pPointFeature != null) {

pPointFeature= pPointCur.NextFeature(); Count++; } }

if (Count != 0) {

IRow pRow = _pTable.CreateRow();

pRow.set_Value(1， pPolyFeature.get_Value(0)); pRow.set_Value(2， Count); pRow.Store(); }

pPolyFeature = pPolyCursor.NextFeature(); } }

效果如下：