ArcEngine根据属性分割要素类的实现方法

在做数据处理时，我们经常遇到的一个问题就是分类问题，如下图所示，现有一份中国各省、自治区、直辖市的shp文件，现在要求根据Name字段将该shp文件分割成多个shp文件，每个shp文件代表一个省、自治区或直辖市。

熟悉ArcGIS的同志应该清楚，在ArcToolbox工具箱下有一个分割工具可以帮我们实现该功能，如下图所示：

其实在ArcEngine中我们也可以实现这一功能，核心接口为IFeatureDataConverter，代码如下：

using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
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 WindowsFormsApplication1
{public partial class MainForm : Form{public MainForm(){InitializeComponent();}// 分割private void btnSplit_Click(object sender, EventArgs e){IFeatureClass pFeatureClass = GetFeatureClass(@"E:\Users\dsf\Desktop\data\china.shp");List<string> list = GetUniqueValue(pFeatureClass, "Name");foreach (string item in list){IQueryFilter pQueryFilter = new QueryFilter();pQueryFilter.WhereClause = "Name='" + item + "'";SplitByAttribute(pFeatureClass, pQueryFilter, @"E:\Users\dsf\Desktop\新建文件夹\" + item + ".shp");}}// 获取要素类private IFeatureClass GetFeatureClass(string filePath){IWorkspaceFactory pWorkspaceFactory = new ShapefileWorkspaceFactory();IWorkspaceFactoryLockControl pWorkspaceFactoryLockControl = pWorkspaceFactory as IWorkspaceFactoryLockControl;if (pWorkspaceFactoryLockControl.SchemaLockingEnabled){pWorkspaceFactoryLockControl.DisableSchemaLocking();}IWorkspace pWorkspace = pWorkspaceFactory.OpenFromFile(System.IO.Path.GetDirectoryName(filePath), 0);IFeatureWorkspace pFeatureWorkspace = pWorkspace as IFeatureWorkspace;IFeatureClass pFeatureClass = pFeatureWorkspace.OpenFeatureClass(System.IO.Path.GetFileName(filePath));return pFeatureClass;}// 获取唯一值private List<string> GetUniqueValue(IFeatureClass pFeatureClass, string fieldName){IQueryFilter pQueryFilter = new QueryFilter();pQueryFilter.AddField(fieldName);// 要素游标IFeatureCursor pFeatureCursor = pFeatureClass.Search(pQueryFilter, true);ICursor pCursor = pFeatureCursor as ICursor;// 设置统计信息IDataStatistics pDataStatistics = new DataStatistics();pDataStatistics.Field = fieldName;pDataStatistics.Cursor = pCursor;// 获取唯一值IEnumerator uniqueValues = pDataStatistics.UniqueValues;uniqueValues.Reset();// 遍历唯一值List<string> list = new List<string>();while (uniqueValues.MoveNext()){list.Add(uniqueValues.Current.ToString());}return list;}// 根据属性分割private void SplitByAttribute(IFeatureClass pSourceFeatureClass, IQueryFilter pQueryFilter, string filePath){// 源数据工作空间IDataset pSourceDataset = pSourceFeatureClass as IDataset;IFeatureClassName pSourceFeatureClassName = pSourceDataset.FullName as IFeatureClassName;IWorkspace pSourceWorkspace = pSourceDataset.Workspace;// 目标数据工作空间IWorkspaceFactory pTargetWorkspaceFactory = new ShapefileWorkspaceFactory();IWorkspace pTargetWorkspace = pTargetWorkspaceFactory.OpenFromFile(System.IO.Path.GetDirectoryName(filePath), 0);IDataset pTargetDataSet = pTargetWorkspace as IDataset;// 设置目标数据属性IWorkspaceName pTargetWorkspaceName = pTargetDataSet.FullName as IWorkspaceName;IFeatureClassName pTargetFeatureClassName = new FeatureClassName() as IFeatureClassName;IDatasetName pTargetDatasetName = pTargetFeatureClassName as IDatasetName;pTargetDatasetName.WorkspaceName = pTargetWorkspaceName;pTargetDatasetName.Name = System.IO.Path.GetFileName(filePath);// 检查字段IFieldChecker pFieldChecker = new FieldChecker();pFieldChecker.InputWorkspace = pSourceWorkspace;pFieldChecker.ValidateWorkspace = pTargetWorkspace;// 字段转换IFields pSourceFields = pSourceFeatureClass.Fields;IFields pTargetFields = null;IEnumFieldError pEnumFieldError = null;pFieldChecker.Validate(pSourceFields, out pEnumFieldError, out pTargetFields);// 数据转换IFeatureDataConverter pFeatureDataConverter = new FeatureDataConverter();pFeatureDataConverter.ConvertFeatureClass(pSourceFeatureClassName, pQueryFilter, null, pTargetFeatureClassName, null, pTargetFields, "", 1000, 0);}}
}

最终的分割结果如下图所示：

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