ArcEngine合并要素

开发环境：VS2013 + ArcEngine 10.4
在数据量较大时，请用ITopologicalOperator的ConstructUnion方法，而不是一个一个Union

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Runtime.InteropServices;
using ESRI.ArcGIS.Carto;
using ESRI.ArcGIS.Controls;
using ESRI.ArcGIS.DataSourcesFile;
using ESRI.ArcGIS.DataSourcesGDB;
using ESRI.ArcGIS.Display;
using ESRI.ArcGIS.esriSystem;
using ESRI.ArcGIS.Geodatabase;
using ESRI.ArcGIS.Geometry;
using ESRI.ArcGIS.Output;
using ESRI.ArcGIS.SystemUI;namespace WindowsFormsApplication2
{public class MergeTool{/// <summary>/// 输入要素/// </summary>private IFeatureClass in_FeatureClass;/// <summary>/// 构造函数/// </summary>/// <param name="in_FeatureClass"></param>public MergeTool(IFeatureClass in_FeatureClass){this.in_FeatureClass = in_FeatureClass;}/// <summary>/// 获取空间参考/// </summary>/// <returns></returns>private ISpatialReference GetSpatialReference(){IGeoDataset pGeoDataset = in_FeatureClass as IGeoDataset;ISpatialReference pSpatialReference = pGeoDataset.SpatialReference;return pSpatialReference;}/// <summary>/// 合并几何体/// </summary>/// <returns></returns>private IGeometry GetMergeGeometry(){IGeometryBag pGeometryBag = new GeometryBag() as IGeometryBag;pGeometryBag.SpatialReference = GetSpatialReference();IGeometryCollection pGeometryCollection = pGeometryBag as IGeometryCollection;// 属性过滤IQueryFilter pQueryFilter = new QueryFilter();pQueryFilter.AddField("Shape");// 要素游标IFeatureCursor pFeatureCursor = in_FeatureClass.Search(pQueryFilter, true);IFeature pFeature = pFeatureCursor.NextFeature();if (pFeature == null){return null;}// 遍历游标object missing = Type.Missing;while (pFeature != null){pGeometryCollection.AddGeometry(pFeature.ShapeCopy, ref missing, ref missing);pFeature = pFeatureCursor.NextFeature();}Marshal.ReleaseComObject(pFeatureCursor);// 合并要素ITopologicalOperator pTopologicalOperator = null;if (in_FeatureClass.ShapeType == esriGeometryType.esriGeometryPoint){pTopologicalOperator = new Multipoint() as ITopologicalOperator;pTopologicalOperator.ConstructUnion(pGeometryCollection as IEnumGeometry);}else if (in_FeatureClass.ShapeType == esriGeometryType.esriGeometryPolyline){pTopologicalOperator = new Polyline() as ITopologicalOperator;pTopologicalOperator.ConstructUnion(pGeometryCollection as IEnumGeometry);}else{pTopologicalOperator = new Polygon() as ITopologicalOperator;pTopologicalOperator.ConstructUnion(pGeometryCollection as IEnumGeometry);}return pTopologicalOperator as IGeometry;}/// <summary>/// 执行工具/// </summary>/// <param name="filePath"></param>/// <returns></returns>public IFeatureClass ExecuteTool(string filePath){IGeometryDef pGeometryDef = new GeometryDef();IGeometryDefEdit pGeometryDefEdit = pGeometryDef as IGeometryDefEdit;if (in_FeatureClass.ShapeType == esriGeometryType.esriGeometryPoint){pGeometryDefEdit.GeometryType_2 = esriGeometryType.esriGeometryMultipoint;pGeometryDefEdit.HasM_2 = false;pGeometryDefEdit.HasZ_2 = false;pGeometryDefEdit.SpatialReference_2 = GetSpatialReference();}else if (in_FeatureClass.ShapeType == esriGeometryType.esriGeometryPolyline){pGeometryDefEdit.GeometryType_2 = esriGeometryType.esriGeometryPolyline;pGeometryDefEdit.HasM_2 = false;pGeometryDefEdit.HasZ_2 = false;pGeometryDefEdit.SpatialReference_2 = GetSpatialReference();}else{pGeometryDefEdit.GeometryType_2 = esriGeometryType.esriGeometryPolygon;pGeometryDefEdit.HasM_2 = false;pGeometryDefEdit.HasZ_2 = false;pGeometryDefEdit.SpatialReference_2 = GetSpatialReference();}// 字段集合IFields pFields = new Fields();IFieldsEdit pFieldsEdit = pFields as IFieldsEdit;// ShapeIField pField = new Field();IFieldEdit pFieldEdit = pField as IFieldEdit;pFieldEdit.Type_2 = esriFieldType.esriFieldTypeGeometry;pFieldEdit.GeometryDef_2 = pGeometryDef;pFieldEdit.AliasName_2 = "Shape";pFieldEdit.Name_2 = "Shape";pFieldEdit.IsNullable_2 = false;pFieldEdit.Required_2 = true;pFieldsEdit.AddField(pField);// 创建要素类IWorkspaceFactory pWorkspaceFactory = new ShapefileWorkspaceFactory();IWorkspace pWorkspace = pWorkspaceFactory.OpenFromFile(System.IO.Path.GetDirectoryName(filePath), 0);IFeatureWorkspace pFeatureWorkspace = pWorkspace as IFeatureWorkspace;IFeatureClass pFeatureClass = pFeatureWorkspace.CreateFeatureClass(System.IO.Path.GetFileName(filePath), pFields, null, null, esriFeatureType.esriFTSimple, "Shape", "");// 插入要素IFeatureBuffer pFeatureBuffer = pFeatureClass.CreateFeatureBuffer();IFeatureCursor pFeatureCursor = pFeatureClass.Insert(true);pFeatureBuffer.Shape = GetMergeGeometry();pFeatureCursor.InsertFeature(pFeatureBuffer);pFeatureCursor.Flush();return pFeatureClass;}}
}

运行结果：
初始数据如下图：

合并数据如下图：

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