C#中Gdal讀取SHP文件

1.主要是C# 版本下載，儘量最新吧！

在這裏  http://www.gisinternals.com/sdk/  點擊打開鏈接 下了 適合自己的版本。我下載的是\release-1600-gdal-1-10-mapserver-6-2版本，

把所需要的C#的的dll庫，\release-1600-gdal-1-10-mapserver-6-2\bin\gdal\csharp在這裏找到。 

主要的DLL有8個DLL文件gdal_csharp,gdal_wrap,gdalconst_csharp,gdalconst_wrap,ogr_csharp,ogr_warp,osr_csharp,osr_wrap  拷貝到VS項目的程序文件夾bin中。

當然\release-1600-gdal-1-10-mapserver-6-2\bin 下面的那麼多DLL也做好拷貝到你的工程的bin下，因爲裏面的依賴關係我也分不清。

2.  寫了個簡單的讀取類，名稱爲GdalRead.cs。當然，要在工程裏引用四個含有*-csharp的DLL。

來個截圖：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;
//
using System.IO;
using OSGeo.GDAL;
using OSGeo.OGR;
using OSGeo.OSR;
using System.Collections;

namespace GdalReadSHP
{
    /// <summary>
    /// 定義SHP解析類
    /// </summary>
    public class ShpRead
    {
        /// 保存SHP屬性字段
        public OSGeo.OGR.Driver oDerive;
        public List<string> m_FeildList;
        private Layer oLayer;
        public string sCoordiantes;
        public ShpRead()
        {
            m_FeildList = new List<string>();
            oLayer = null;
            sCoordiantes = null;
        }

        /// <summary>
        /// 初始化Gdal
        /// </summary>
        public void InitinalGdal()
        {
            // 爲了支持中文路徑
            Gdal.SetConfigOption("GDAL_FILENAME_IS_UTF8", "YES");
            // 爲了使屬性表字段支持中文
            Gdal.SetConfigOption("SHAPE_ENCODING", "");
            Gdal.AllRegister();
            Ogr.RegisterAll();

            oDerive = Ogr.GetDriverByName("ESRI Shapefile");
            if (oDerive == null)
            {
                MessageBox.Show("文件不能打開，請檢查");
            }
        }

        /// <summary>
        /// 獲取SHP文件的層
        /// </summary>
        /// <param name="sfilename"></param>
        /// <param name="oLayer"></param>
        /// <returns></returns>
        public bool GetShpLayer(string sfilename)
        {
            if (null == sfilename || sfilename.Length <= 3)
            {
                oLayer = null;
                return false;
            }
            if (oDerive == null)
            {
                MessageBox.Show("文件不能打開，請檢查");
            }
            DataSource ds = oDerive.Open(sfilename, 1);
            if (null == ds)
            {
                oLayer = null;
                return false;
            }
            int iPosition = sfilename.LastIndexOf("\\");
            string sTempName = sfilename.Substring(iPosition + 1, sfilename.Length - iPosition - 4 - 1);
            oLayer = ds.GetLayerByName(sTempName);
            if (oLayer == null)
            {
                ds.Dispose();
                return false;
            }
            return true;
        }
        /// <summary>
        /// 獲取所有的屬性字段
        /// </summary>
        /// <returns></returns>
        public bool GetFeilds()
        {
            if (null == oLayer)
            {
                return false;
            }
            m_FeildList.Clear();
            wkbGeometryType oTempGeometryType = oLayer.GetGeomType();
            List<string> TempstringList = new List<string>();

            //
            FeatureDefn oDefn = oLayer.GetLayerDefn();
            int iFieldCount = oDefn.GetFieldCount();
            for (int iAttr = 0; iAttr < iFieldCount; iAttr++)
            {
                FieldDefn oField = oDefn.GetFieldDefn(iAttr);
                if (null != oField)
                {
                    m_FeildList.Add(oField.GetNameRef());
                }
            }
            return true;
        }
        /// <summary>
        ///  獲取某條數據的字段內容
        /// </summary>
        /// <param name="iIndex"></param>
        /// <param name="FeildStringList"></param>
        /// <returns></returns>
        public bool GetFeildContent(int iIndex, out List<string> FeildStringList)
        {
            FeildStringList = new List<string>();
            Feature oFeature = null;
            if ((oFeature = oLayer.GetFeature(iIndex)) != null)
            {

                FeatureDefn oDefn = oLayer.GetLayerDefn();
                int iFieldCount = oDefn.GetFieldCount();
                // 查找字段屬性
                for (int iAttr = 0; iAttr < iFieldCount; iAttr++)
                {
                    FieldDefn oField = oDefn.GetFieldDefn(iAttr);
                    string sFeildName = oField.GetNameRef();

                    #region 獲取屬性字段
                    FieldType Ftype = oFeature.GetFieldType(sFeildName);
                    switch (Ftype)
                    {
                        case FieldType.OFTString:
                            string sFValue = oFeature.GetFieldAsString(sFeildName);
                            string sTempType = "string";
                            FeildStringList.Add(sFValue);
                            break;
                        case FieldType.OFTReal:
                            double dFValue = oFeature.GetFieldAsDouble(sFeildName);
                            sTempType = "float";
                            FeildStringList.Add(dFValue.ToString());
                            break;
                        case FieldType.OFTInteger:
                            int iFValue = oFeature.GetFieldAsInteger(sFeildName);
                            sTempType = "int";
                            FeildStringList.Add(iFValue.ToString());
                            break;
                        default:
                            //sFValue = oFeature.GetFieldAsString(ChosenFeildIndex[iFeildIndex]);
                            sTempType = "string";
                            break;
                    }
                    #endregion
                }
            }
            return true;
        }
        /// <summary>
        /// 獲取數據
        /// </summary>
        /// <returns></returns>
        public bool GetGeometry(int iIndex)
        {
            if (null == oLayer)
            {
                return false;
            }
            int iFeatureCout = oLayer.GetFeatureCount(0);
            Feature oFeature = null;
            oFeature = oLayer.GetFeature(iIndex);
            //  Geometry
            Geometry oGeometry = oFeature.GetGeometryRef();
            wkbGeometryType oGeometryType = oGeometry.GetGeometryType();
            switch (oGeometryType)
            {
                case wkbGeometryType.wkbPoint:
                    oGeometry.ExportToWkt(out sCoordiantes);
                    sCoordiantes = sCoordiantes.ToUpper().Replace("POINT (", "").Replace(")", "");
                    break;
                case wkbGeometryType.wkbLineString:
                case wkbGeometryType.wkbLinearRing:
                    oGeometry.ExportToWkt(out sCoordiantes);
                    sCoordiantes = sCoordiantes.ToUpper().Replace("LINESTRING (", "").Replace(")", "");
                    break;
                default:
                    break;
            }
            return false;
        }

    }//END class
}

3. 在program.cs中調用。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;

using System.Windows.Forms;

using OSGeo.GDAL;
using OSGeo.OGR;
using OSGeo.OSR;
using System.Collections;

namespace GdalReadSHP
{
    class Program
    {
        static void Main(string[] args)
        {
            string sShpFileName = @"D:\VRMap6_Data\line92\RainMainPipe.shp";
            ShpRead m_Shp = new ShpRead();
            // 初始化GDAL和OGR
            m_Shp.InitinalGdal();
            //
            m_Shp.GetShpLayer(sShpFileName);
            // 獲取所有屬性字段名稱,存放在m_FeildList中
            m_Shp.GetFeilds();

            List<string> FeildStringList = null;
            m_Shp.GetFeildContent(0, out FeildStringList);

            // 獲取某條FID的數據
            m_Shp.GetGeometry(0);
            MessageBox.Show(m_Shp.sCoordiantes);
        }
    }
}

一開始自己疏忽了，總是報錯。最後才發現，自己沒初始化GDAL和OGR，我類個去！！

/// <summary>
        /// 初始化Gdal
        /// </summary>
        public void InitinalGdal()
        {
            // 爲了支持中文路徑
            Gdal.SetConfigOption("GDAL_FILENAME_IS_UTF8", "NO");
            // 爲了使屬性表字段支持中文
            Gdal.SetConfigOption("SHAPE_ENCODING", "");
            Gdal.AllRegister();
            Ogr.RegisterAll();

            oDerive = Ogr.GetDriverByName("ESRI Shapefile");
            if (oDerive == null)
            {
                MessageBox.Show("文件不能打開，請檢查");
            }
        }

至於對SHP用C#寫，目前咩有用到。

說明：

網上好多Gdal支持中文路徑說需要：

Gdal.SetConfigOption("GDAL_FILENAME_IS_UTF8", "NO");

我試了一下，貌似用YES才行。

// 爲了支持中文路徑
Gdal.SetConfigOption("GDAL_FILENAME_IS_UTF8", "YES");

若中文名稱的SHP文件，用GetLayerByName(stirng sName); 我測試是不行的。

需要改爲Layer oLayer = ds.GetLayerByIndex(0);