ArcEngine将GDB中的要素类导出为shp文件_gdb数据集要素导出

上一篇博客介绍了如何将shp文件导入GDB中，现在反过来介绍如何将GDB中的要素类导出为shp文件，其实方法大同小异，就不多介绍了，直接上代码：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
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();
        }

        // 要素类导出为shp
        private void btnExport_Click(object sender, EventArgs e)
        {
            // 属性过滤器
            IQueryFilter pQueryFilter = new QueryFilter();
            pQueryFilter.AddField("OBJECTID");
            pQueryFilter.WhereClause = "OBJECTID>=1 and OBJECTID<=3";

            // 导入数据
            IFeatureClass pFeatureClass = GetFeatureClass(@"C:\Users\DSF\Desktop\test.gdb", "区域");
            bool ok = Export(pFeatureClass, pQueryFilter, @"C:\Users\DSF\Desktop\data\区域.shp");

            // 提示用户信息
            if (ok)
            {
                MessageBox.Show("导出成功", "提示", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
            }
            else
            {
                MessageBox.Show("导出失败", "提示", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

        // 获取要素类
        private IFeatureClass GetFeatureClass(string directory, string className)
        {
            IWorkspaceFactory pWorkspaceFactory = new FileGDBWorkspaceFactory();
            IWorkspace pWorkspace = pWorkspaceFactory.OpenFromFile(directory, 0);
            IFeatureWorkspace pFeatureWorkspace = pWorkspace as IFeatureWorkspace;
            IFeatureClass pFeatureClass = pFeatureWorkspace.OpenFeatureClass(className);
            return pFeatureClass;
        }

        // 导出要素类
        private bool Export(IFeatureClass pSourceFeatureClass, IQueryFilter pQueryFilter, string filePath)
        {
            // 源数据工作空间（GDB）
            IDataset pSourceDataset = pSourceFeatureClass as IDataset;
            IFeatureClassName pSourceFeatureClassName = pSourceDataset.FullName as IFeatureClassName;
            IWorkspace pSourceWorkspace = pSourceDataset.Workspace;

            // 目标数据工作空间（SHP）
            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();
            try
            {
                pFeatureDataConverter.ConvertFeatureClass(pSourceFeatureClassName, pQueryFilter, null, pTargetFeatureClassName, null, pTargetFields, "", 1000, 0);
                return true;
            }
            catch
            {
                return false;
            }
        }
    }
}
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