/// <summary>
/// Writes the specified feature collection.
/// </summary>
/// <param name="featureCollection">The feature collection.</param>
public void Write(IEnumerable <IFeature> featureCollection)
{
// Test if the Header is initialized
if (Header is null)
{
throw new ApplicationException("Header must be set first!");
}
using (var featuresEnumerator = featureCollection.GetEnumerator())
{
// scan the original sequence looking for a geometry that we can
// use to figure out the shape type. keep the original features
// around so we don't have to loop through the input twice; we
// shouldn't have to look *too* far for a non-empty geometry.
Geometry representativeGeometry = null;
var headFeatures = new List <IFeature>();
while (representativeGeometry?.IsEmpty != false && featuresEnumerator.MoveNext())
{
var feature = featuresEnumerator.Current;
headFeatures.Add(feature);
representativeGeometry = feature.Geometry;
}
var shapeFileType = Shapefile.GetShapeType(representativeGeometry);
using (_dbaseWriter)
using (var shapefileWriter = new ShapefileWriter(_geometryFactory, _streamProviderRegistry, shapeFileType))
{
_dbaseWriter.Write(Header);
string[] fieldNames = Array.ConvertAll(Header.Fields, field => field.Name);
object[] values = new object[fieldNames.Length];
// first, write the one(s) that we scanned already.
foreach (var feature in headFeatures)
{
Write(feature);
}
// now continue through the features we haven't scanned yet.
while (featuresEnumerator.MoveNext())
{
Write(featuresEnumerator.Current);
}
void Write(IFeature feature)
{
shapefileWriter.Write(feature.Geometry);
var attribs = feature.Attributes;
for (int i = 0; i < fieldNames.Length; i++)
{
values[i] = attribs[fieldNames[i]];
}
_dbaseWriter.Write(values);
}
}
}
}
public static void WriteGeometryCollection(IStreamProviderRegistry streamProviderRegistry,
GeometryCollection geometryCollection, bool createDummyDbf = true)
{
var shapeFileType = Shapefile.GetShapeType(geometryCollection);
using (var writer = new ShapefileWriter(geometryCollection.Factory, streamProviderRegistry, shapeFileType))
{
var dbfWriter = createDummyDbf ? new DbaseFileWriter(streamProviderRegistry) : null;
WriteGeometryCollection(writer, dbfWriter, geometryCollection, createDummyDbf);
if (dbfWriter != null)
{
dbfWriter.Dispose();
}
}
}
/// <summary>
/// Method to write a collection of geometries to a shapefile on disk.
/// </summary>
/// <remarks>
/// Assumes the type given for the first geometry is the same for all subsequent geometries.
/// For example, is, if the first Geometry is a Multi-polygon/ Polygon, the subsequent geometies are
/// Muli-polygon/ polygon and not lines or points.
/// The dbase file for the corresponding shapefile contains one column called row. It contains
/// the row number.
/// </remarks>
/// <param name="filename">The filename to write to (minus the .shp extension).</param>
/// <param name="geometryCollection">The GeometryCollection to write.</param>
public static void WriteGeometryCollection(string filename, IGeometryCollection geometryCollection)
{
var shapeFileType = Shapefile.GetShapeType(geometryCollection);
var numShapes = geometryCollection.NumGeometries;
using (var writer = new ShapefileWriter(geometryCollection.Factory, filename, shapeFileType))
{
for (var i = 0; i < numShapes; i++)
{
writer.Write(geometryCollection[i]);
}
}
WriteDummyDbf(filename + ".dbf", numShapes);
}
/// <summary>
/// Writes a shapefile to disk.
/// </summary>
/// <remarks>
/// Assumes the type given for the first geometry is the same for all subsequent geometries.
/// For example, is, if the first Geometry is a Multi-polygon/ Polygon, the subsequent geometies are
/// Muli-polygon/ polygon and not lines or points.
/// The dbase file for the corresponding shapefile contains one column called row. It contains
/// the row number.
/// </remarks>
/// <param name="filename">The filename to write to (minus the .shp extension).</param>
/// <param name="geometryCollection">The GeometryCollection to write.</param>
public void Write(IGeometryCollection geometryCollection)
{
//FileStream shpStream = new FileStream(filename + ".shp", FileMode.Create);
//FileStream shxStream = new FileStream(filename + ".shx", FileMode.Create);
shpStream = new MemoryStream();
shxStream = new MemoryStream();
BigEndianBinaryWriter shpBinaryWriter = new BigEndianBinaryWriter(shpStream);
BigEndianBinaryWriter shxBinaryWriter = new BigEndianBinaryWriter(shxStream);
// assumes
ShapeHandler handler = Shapefile.GetShapeHandler(Shapefile.GetShapeType(geometryCollection.Geometries[0]));
IGeometry body;
int numShapes = geometryCollection.NumGeometries;
// calc the length of the shp file, so it can put in the header.
int shpLength = 50;
for (int i = 0; i < numShapes; i++)
{
body = (IGeometry)geometryCollection.Geometries[i];
shpLength += 4; // length of header in WORDS
shpLength += handler.GetLength(body); // length of shape in WORDS
}
int shxLength = 50 + (4 * numShapes);
// write the .shp header
ShapefileHeader shpHeader = new ShapefileHeader();
shpHeader.FileLength = shpLength;
// get envelope in external coordinates
Envelope env = geometryCollection.EnvelopeInternal as Envelope;
Envelope bounds = ShapeHandler.GetEnvelopeExternal(geometryFactory.PrecisionModel, env);
shpHeader.Bounds = bounds;
// assumes Geometry type of the first item will the same for all other items
// in the collection.
shpHeader.ShapeType = Shapefile.GetShapeType(geometryCollection.Geometries[0]);
shpHeader.Write(shpBinaryWriter);
// write the .shx header
ShapefileHeader shxHeader = new ShapefileHeader();
shxHeader.FileLength = shxLength;
shxHeader.Bounds = shpHeader.Bounds;
// assumes Geometry type of the first item will the same for all other items in the collection.
shxHeader.ShapeType = Shapefile.GetShapeType(geometryCollection.Geometries[0]);
shxHeader.Write(shxBinaryWriter);
// write the individual records.
int _pos = 50; // header length in WORDS
for (int i = 0; i < numShapes; i++)
{
body = geometryCollection.Geometries[i];
int recordLength = handler.GetLength(body);
shpBinaryWriter.WriteIntBE(i + 1);
shpBinaryWriter.WriteIntBE(recordLength);
shxBinaryWriter.WriteIntBE(_pos);
shxBinaryWriter.WriteIntBE(recordLength);
_pos += 4; // length of header in WORDS
handler.Write(body, shpBinaryWriter, geometryFactory);
_pos += recordLength; // length of shape in WORDS
}
shxBinaryWriter.Flush();
//shxStream.Seek(0, SeekOrigin.Begin);
////shxBinaryWriter.Close();
shpBinaryWriter.Flush();
//shpStream.Seek(0, SeekOrigin.Begin);
//shpBinaryWriter.Close();
// WriteDummyDbf(filename + ".dbf", numShapes);
}