.NET C# 使用GDAL读取FileGDB要素类

.NET C# 使用GDAL读取FileGDB要素类

1 环境

VisualStudio2022 + .NET6 + GDAL 3.7.5

2 Nuget

3 Code

using OSGeo.OGR;
using OSGeo.OSR;namespace TestGDAL
{internal class Program{static void Main(string[] args){string strDataPath = @".\Data\Default.gdb";GdalConfiguration.ConfigureGdal();GdalConfiguration.ConfigureOgr();// 打开 FileGDBusing (var driver = Ogr.GetDriverByName("OpenFileGDB"))using (var dataSource = driver.Open(strDataPath, 0)){if (dataSource == null){Console.WriteLine("Failed to open FileGDB.");return;}List<Layer> layers = new List<Layer>();int layerCount = dataSource.GetLayerCount();for (int i = 0; i < layerCount; i++){// 读取要素类Layer layer = dataSource.GetLayerByIndex(i);layers.Add(layer);}Console.WriteLine("GDB Layers: ");foreach (var layer in layers){string layerName = layer.GetName();// 要素类集合类型wkbGeometryType wkbGeometryType = layer.GetGeomType();// 空间引用（坐标系）SpatialReference spatialReference = layer.GetSpatialRef();Console.WriteLine($"LayerName: {layerName}\tGeometryType: {wkbGeometryType}\tSpatialReference: {spatialReference.GetName()}");}Console.WriteLine();Console.WriteLine("Geometry: ");foreach (var layer in layers){Console.WriteLine(layer.GetName());Console.WriteLine("Geometry Wkt");// 将读指针设置初始位置layer.ResetReading();Feature feature;while ((feature = layer.GetNextFeature()) != null){try{// 几何图形Geometry geometry = feature.GetGeometryRef();int v = geometry.ExportToWkt(out string wkt);Console.WriteLine(wkt);}catch (Exception ex){Console.WriteLine(ex);}finally{feature.Dispose();}}}Console.WriteLine();Console.WriteLine("Attribute Table: ");foreach (var layer in layers){Console.WriteLine(layer.GetName());FeatureDefn featureDefn = layer.GetLayerDefn();List<FieldDefn> fieldDefns = new List<FieldDefn>();int fieldCount = featureDefn.GetFieldCount();for (int i = 0; i < fieldCount; i++){// 获取字段FieldDefn fieldDefn = featureDefn.GetFieldDefn(i);fieldDefns.Add(fieldDefn);}Console.WriteLine(string.Join(",", fieldDefns.Select(f => f.GetName())));layer.ResetReading();Feature feature;while ((feature = layer.GetNextFeature()) != null){try{List<string> values = new List<string>();for (int i = 0; i < fieldDefns.Count; i++){FieldDefn fieldDefn = fieldDefns[i];string fieldName = fieldDefn.GetName();// 字段类型FieldType fieldType = fieldDefn.GetFieldType();// 获取字段值switch (fieldType){case FieldType.OFTInteger:int valInt = feature.GetFieldAsInteger(fieldName);values.Add(valInt + "");break;case FieldType.OFTString:string valStr = feature.GetFieldAsString(fieldName);values.Add(valStr);break;case FieldType.OFTWideString:string valWidStr = feature.GetFieldAsString(fieldName);values.Add(valWidStr);break;case FieldType.OFTDate:feature.GetFieldAsDateTime(fieldName,out int dyear,out int dmonth,out int dday,out int dhour,out int dminute,out float dsecond,out int dtzFlag);DateTime valDate = new DateTime(dyear, dmonth, dday, dhour, dminute, Convert.ToInt32(dsecond));values.Add(valDate.ToString());break;case FieldType.OFTTime:feature.GetFieldAsDateTime(fieldName,out int tyear,out int tmonth,out int tday,out int thour,out int tminute,out float tsecond,out int ttzFlag);DateTime valTime = new DateTime(tyear, tmonth, tday, thour, tminute, Convert.ToInt32(tsecond));values.Add(valTime.ToString());break;case FieldType.OFTDateTime:feature.GetFieldAsDateTime(fieldName,out int dtyear,out int dtmonth,out int dtday,out int dthour,out int dtminute,out float dtsecond,out int dttzFlag);DateTime valDateTime = new DateTime(dtyear, dtmonth, dtday, dthour, dtminute, Convert.ToInt32(dtsecond));values.Add(valDateTime.ToString());break;case FieldType.OFTInteger64:long valLon = feature.GetFieldAsInteger64(fieldName);values.Add(valLon + "");break;default:break;}}Console.WriteLine(string.Join(",", values));}catch (Exception ex){Console.WriteLine(ex);}finally{feature.Dispose();}}}}}}
}