Arcgis engine 指定图层创建点要素
在指定的图层上创建一个点要素，点要素的位置是通过X,Y坐标指定的，下面是具体的注释 。其中 和IFeatureClassWrite接口有关的代码不要好像也可以实现这个功能，这里是直接通过IFeature添加要素的，不是通过IRow.
The IFeatureClassWrite interface provides low-level write access to feature class data. Any associated object behavior is not triggered. In general, IFeatureClassWrite should only be used when implementing custom features that bypass IRow::Store.
pLayer = this.axMapControl1.get_Layer(i);//所要加的层 IFeatureLayer pFeatureLyr = pLayer as IFeatureLayer;//将ILayer转换为IFeaturelayer，为了对图层上的要素进行编辑 IFeatureClass pFeatCls = pFeatureLyr.FeatureClass;//定义一个要素集合，并获取图层的要素集合 IFeatureClassWrite fr = (IFeatureClassWrite)pFeatCls;//定义一个实现新增要素的接口实例，并该实例作用于当前图层的要素集 IWorkspaceEdit w = (pFeatCls as IDataset).Workspace as IWorkspaceEdit;//定义一个工作编辑工作空间，用于开启前图层的编辑状态 IFeature f;//定义一个IFeature实例，用于添加到当前图层上 w.StartEditing(true);//开启编辑状态 w.StartEditOperation();//开启编辑操作 IPoint p;//定义一个点，用来作为IFeature实例的形状属性，即shape属性 //下面是设置点的坐标和参考系 p = new PointClass(); p.SpatialReference = this.axMapControl1.SpatialReference; p.X = 600; p.Y = 500; //将IPoint设置为IFeature的shape属性时，需要通过中间接口IGeometry转换 IGeometry peo; peo = p; f = pFeatCls.CreateFeature();//实例化IFeature对象， 这样IFeature对象就具有当前图层上要素的字段信息 f.Shape = peo;//设置IFeature对象的形状属性 f.set_Value(3, "house1");//设置IFeature对象的索引是3的字段值 f.Store();//保存IFeature对象 fr.WriteFeature(f);//将IFeature对象，添加到当前图层上 w.StopEditOperation();//停止编辑操作 w.StopEditing(true);//关闭编辑状态，并保存修改 this.axMapControl1.Refresh();//刷新地图
删除指定图层的全部要素
private void DeleteAll()
{
ILayer pLayer = getLayerByName(axMapControl1, "Train");
//getLayerByName()方法为自定义函数，获取名称为“Train”的图层
IFeatureLayer pFeatureLyr = pLayer as IFeatureLayer;//将ILayer转换为IFeaturelayer，为了对图层上的要素进行编辑
IFeatureClass pFeatCls = pFeatureLyr.FeatureClass;//定义一个要素集合，并获取图层的要素集合
ITable pTable = (ITable)pFeatCls;
pTable.DeleteSearchedRows(null);
axMapControl1.ActiveView.Refresh();
}
arcengine创建要素类、图层的方法
对图层的创建除了可以参考下面的代码，也可以参考本博客的这篇文章： shp图层创建。
/// <summary> /// 创建要素类 /// </summary> /// <param name="pObject">IWorkspace或者IFeatureDataset对象</param> /// <param name="pName">要素类名称</param> /// <param name="pSpatialReference">空间参考</param> /// <param name="pFeatureType">要素类型</param> /// <param name="pGeometryType">几何类型</param> /// <param name="pFields">字段集</param> /// <param name="pUidClsId">CLSID值</param> /// <param name="pUidClsExt">EXTCLSID值</param> /// <param name="pConfigWord">配置信息关键词</param> /// <returns>返回IFeatureClass</returns> public static IFeatureClass CreateFeatureClass(object pObject, string pName, ISpatialReference pSpatialReference, esriFeatureType pFeatureType, esriGeometryType pGeometryType, IFields pFields, UID pUidClsId, UID pUidClsExt, string pConfigWord) { #region 错误检测 if (pObject == null) { throw (new Exception("[pObject] 不能为空!")); } if (!((pObject is IFeatureWorkspace) || (pObject is IFeatureDataset))) { throw (new Exception("[pObject] 必须为IFeatureWorkspace 或者 IFeatureDataset")); } if (pName.Length == 0) { throw (new Exception("[pName] 不能为空!")); } if ((pObject is IWorkspace) && (pSpatialReference == null)) { throw (new Exception("[pSpatialReference] 不能为空(对于单独的要素类)")); } #endregion // pUidClsID字段为空时 if (pUidClsId == null) { pUidClsId = new UIDClass(); switch (pFeatureType) { case (esriFeatureType.esriFTSimple): if (pGeometryType == esriGeometryType.esriGeometryLine) pGeometryType = esriGeometryType.esriGeometryPolyline; pUidClsId.Value = "{52353152-891A-11D0-BEC6-00805F7C4268}"; break; case (esriFeatureType.esriFTSimpleJunction): pGeometryType = esriGeometryType.esriGeometryPoint; pUidClsId.Value = "{CEE8D6B8-55FE-11D1-AE55-0000F80372B4}"; break; case (esriFeatureType.esriFTComplexJunction): pUidClsId.Value = "{DF9D71F4-DA32-11D1-AEBA-0000F80372B4}"; break; case (esriFeatureType.esriFTSimpleEdge): pGeometryType = esriGeometryType.esriGeometryPolyline; pUidClsId.Value = "{E7031C90-55FE-11D1-AE55-0000F80372B4}"; break; case (esriFeatureType.esriFTComplexEdge): pGeometryType = esriGeometryType.esriGeometryPolyline; pUidClsId.Value = "{A30E8A2A-C50B-11D1-AEA9-0000F80372B4}"; break; case (esriFeatureType.esriFTAnnotation): pGeometryType = esriGeometryType.esriGeometryPolygon; pUidClsId.Value = "{E3676993-C682-11D2-8A2A-006097AFF44E}"; break; case (esriFeatureType.esriFTDimension): pGeometryType = esriGeometryType.esriGeometryPolygon; pUidClsId.Value = "{496764FC-E0C9-11D3-80CE-00C04F601565}"; break; } } //pUidClsExt字段为空时 if (pUidClsExt == null) { switch (pFeatureType) { case esriFeatureType.esriFTAnnotation: pUidClsExt = new UIDClass(); pUidClsExt.Value = "{24429589-D711-11D2-9F41-00C04F6BC6A5}"; break; case esriFeatureType.esriFTDimension: pUidClsExt = new UIDClass(); pUidClsExt.Value = "{48F935E2-DA66-11D3-80CE-00C04F601565}"; break; } } //字段集合为空时 if (pFields == null) { //实倒化字段集合对象 pFields = new FieldsClass(); IFieldsEdit tFieldsEdit = (IFieldsEdit)pFields; //创建几何对象字段定义 IGeometryDef tGeometryDef = new GeometryDefClass(); IGeometryDefEdit tGeometryDefEdit = tGeometryDef as IGeometryDefEdit; //指定几何对象字段属性值 tGeometryDefEdit.GeometryType_2 = pGeometryType; tGeometryDefEdit.GridCount_2 = 1; tGeometryDefEdit.set_GridSize(0, 1000); if (pObject is IWorkspace) { tGeometryDefEdit.SpatialReference_2 = pSpatialReference; } //创建OID字段 IField fieldOID = new FieldClass(); IFieldEdit fieldEditOID = fieldOID as IFieldEdit; fieldEditOID.Name_2 = "OBJECTID"; fieldEditOID.AliasName_2 = "OBJECTID"; fieldEditOID.Type_2 = esriFieldType.esriFieldTypeOID; tFieldsEdit.AddField(fieldOID); //创建几何字段 IField fieldShape = new FieldClass(); IFieldEdit fieldEditShape = fieldShape as IFieldEdit; fieldEditShape.Name_2 = "SHAPE"; fieldEditShape.AliasName_2 = "SHAPE"; fieldEditShape.Type_2 = esriFieldType.esriFieldTypeGeometry; fieldEditShape.GeometryDef_2 = tGeometryDef; tFieldsEdit.AddField(fieldShape); } //几何对象字段名称 string strShapeFieldName = ""; for (int i = 0; i < pFields.FieldCount; i++) { if (pFields.get_Field(i).Type == esriFieldType.esriFieldTypeGeometry) { strShapeFieldName = pFields.get_Field(i).Name; break; } } if (strShapeFieldName.Length == 0) { throw (new Exception("字段集中找不到几何对象定义")); } IFeatureClass tFeatureClass = null; if (pObject is IWorkspace) { //创建独立的FeatureClass IWorkspace tWorkspace = pObject as IWorkspace; IFeatureWorkspace tFeatureWorkspace = tWorkspace as IFeatureWorkspace; tFeatureClass = tFeatureWorkspace.CreateFeatureClass(pName, pFields, pUidClsId, pUidClsExt, pFeatureType, strShapeFieldName, pConfigWord); } else if (pObject is IFeatureDataset) { //在要素集中创建FeatureClass IFeatureDataset tFeatureDataset = (IFeatureDataset)pObject; tFeatureClass = tFeatureDataset.CreateFeatureClass(pName, pFields, pUidClsId, pUidClsExt, pFeatureType, strShapeFieldName, pConfigWord); } return tFeatureClass; }
图层中批量添加点要素
创建好要素图层后，需要对要素图层添加要素。本部分以点要素的添加为例进行讲解。
/// <summary> /// 点坐标 结构体 /// </summary> public class PointXY { public double dX; public double dY; } /// <summary> /// 建立 ESRI中的 点类型 并 将其转化为基类接口 IGeometry /// </summary> /// <param name="point">点坐标 结构体</param> /// <returns></returns> public IGeometry CreatePoint(PointXY point) { IPoint pPoint = new PointClass(); pPoint.X = point.dX; pPoint.Y = point.dY; IGeometry pGeometry = pPoint as IGeometry; return pGeometry; } /// <summary> /// 批量加入 点坐标 结构体 /// </summary> /// <param name="pLayer">点图层</param> /// <param name="pointCol">泛型集合【点坐标 结构体】</param> /// <returns></returns> public bool AddPointsToLayer(ILayer pLayer, List<PointXY> pointCol) { IFeatureLayer pFeatureLayer = pLayer as IFeatureLayer; if (pFeatureLayer == null) { MessageBox.Show(pLayer.Name + "不是矢量图层!"); return false; } // IFeatureClass pFeatureClass = pFeatureLayer.FeatureClass; if (pFeatureClass.ShapeType != esriGeometryType.esriGeometryPoint) { System.Windows.Forms.MessageBox.Show(pLayer.Name + "不是点图层!"); return false; } // IFeatureCursor pFeatureCursor = pFeatureClass.Insert(true); IFeatureBuffer pFeatureBuffer = null; foreach(PointXY one in pointCol) { pFeatureBuffer = pFeatureClass.CreateFeatureBuffer(); IFeature pNewFeature = pFeatureBuffer as IFeature; pNewFeature.Shape = BuildPoint(one); // pFeatureCursor.InsertFeature(pFeatureBuffer); } pFeatureCursor.Flush(); return true; }
参考文章
小马哥淡定 ， Arcgis engine 指定图层创建点要素