ArcEngine根據屬性分割要素類的實現方法

在做數據處理時，我們經常遇到的一個問題就是分類問題，如下圖所示，現有一份中國各省、自治區、直轄市的shp文件，現在要求根據Name字段將該shp文件分割成多個shp文件，每個shp文件代表一個省、自治區或直轄市。

熟悉ArcGIS的同志應該清楚，在ArcToolbox工具箱下有一個分割工具可以幫我們實現該功能，如下圖所示：


其實在ArcEngine中我們也可以實現這一功能，核心接口爲IFeatureDataConverter，代碼如下：

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\新建文件夾\" + item + ".shp");
            }
        }

        // 獲取要素類
        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;
        }

        // 獲取唯一值
        private List<string> GetUniqueValue(IFeatureClass pFeatureClass, string fieldName)
        {
            IQueryFilter pQueryFilter = new QueryFilter();
            pQueryFilter.AddField(fieldName);

            // 要素遊標
            IFeatureCursor pFeatureCursor = pFeatureClass.Search(pQueryFilter, true);
            ICursor pCursor = pFeatureCursor as ICursor;

            // 設置統計信息
            IDataStatistics pDataStatistics = new DataStatistics();
            pDataStatistics.Field = fieldName;
            pDataStatistics.Cursor = pCursor;

            // 獲取唯一值
            IEnumerator uniqueValues = pDataStatistics.UniqueValues;
            uniqueValues.Reset();

            // 遍歷唯一值
            List<string> list = new List<string>();
            while (uniqueValues.MoveNext())
            {
                list.Add(uniqueValues.Current.ToString());
            }
            return list;
        }

        // 根據屬性分割
        private void SplitByAttribute(IFeatureClass pSourceFeatureClass, IQueryFilter pQueryFilter, string filePath)
        {
            // 源數據工作空間
            IDataset pSourceDataset = pSourceFeatureClass as IDataset;
            IFeatureClassName pSourceFeatureClassName = pSourceDataset.FullName as IFeatureClassName;
            IWorkspace pSourceWorkspace = pSourceDataset.Workspace;

            // 目標數據工作空間
            IWorkspaceFactory pTargetWorkspaceFactory = new ShapefileWorkspaceFactory();
            IWorkspace pTargetWorkspace = pTargetWorkspaceFactory.OpenFromFile(System.IO.Path.GetDirectoryName(filePath), 0);
            IDataset pTargetDataSet = pTargetWorkspace as IDataset;

            // 設置目標數據屬性
            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);

            // 檢查字段
            IFieldChecker pFieldChecker = new FieldChecker();
            pFieldChecker.InputWorkspace = pSourceWorkspace;
            pFieldChecker.ValidateWorkspace = pTargetWorkspace;

            // 字段轉換
            IFields pSourceFields = pSourceFeatureClass.Fields;
            IFields pTargetFields = null;
            IEnumFieldError pEnumFieldError = null;
            pFieldChecker.Validate(pSourceFields, out pEnumFieldError, out pTargetFields);

            // 數據轉換
            IFeatureDataConverter pFeatureDataConverter = new FeatureDataConverter();
            pFeatureDataConverter.ConvertFeatureClass(pSourceFeatureClassName, pQueryFilter, null, pTargetFeatureClassName, null, pTargetFields, "", 1000, 0);
        }
    }
}

最終的分割結果如下圖所示：