/// <summary>
/// Write the enumeration of features to shapefile (shp, shx and dbf)
/// </summary>
/// <param name="filename">Filename to create</param>
/// <param name="features">Enumeration of features to write, features will be enumerated once</param>
/// <param name="fields">Fields that should be written, only those attributes specified here will be mapped from the feature attributetable while writing</param>
/// <param name="shapeGeometryType">Type of geometries shapefile</param>
/// <param name="dbfEncoding">Optional Encoding to be used when writing the DBF-file (default Windows-1252)</param>
public static void WriteFeatures(string filename, IEnumerable <IFeature> features, DbaseFieldDescriptor[] fields, ShapeGeometryType shapeGeometryType,
ICoordinateSystem coordinateSystem = null,
Encoding dbfEncoding = null)
{
if (coordinateSystem != null)
{
string prjFile = Path.ChangeExtension(filename, ".prj");
PrjFileWriter.Write(prjFile, coordinateSystem, dbfEncoding == null ? Encoding.Default : dbfEncoding);
}
// Set default encoding if not specified
if (dbfEncoding == null)
{
dbfEncoding = Encoding.GetEncoding(1252);
}
// Open shapefile and dbase stream writers
using (var shpWriter = new ShapefileWriter(Path.ChangeExtension(filename, ".shp"), shapeGeometryType))
{
using (var dbfWriter = new DbaseFileWriter(Path.ChangeExtension(filename, ".dbf"), dbfEncoding))
{
var dbfHeader = new DbaseFileHeader(dbfEncoding);
foreach (var field in fields)
{
dbfHeader.AddColumn(field.Name, field.DbaseType, field.Length, field.DecimalCount);
}
dbfWriter.Write(dbfHeader);
var numFeatures = 0;
foreach (var feature in features)
{
shpWriter.Write(feature.Geometry);
var values = new object[fields.Length];
for (var i = 0; i < fields.Length; i++)
{
values[i] = feature.Attributes[fields[i].Name];
}
dbfWriter.Write(values);
numFeatures++;
}
// set the number of records
dbfHeader.NumRecords = numFeatures;
// Update the header
dbfWriter.Write(dbfHeader);
// write the end of dbase file marker
dbfWriter.WriteEndOfDbf();
// close the dbase stream
dbfWriter.Close();
}
}
}
/// <summary>
/// Writes the specified feature collection.
/// </summary>
/// <param name="featureCollection">The feature collection.</param>
public void Write(IList <IFeature> featureCollection)
{
// Test if the Header is initialized
if (Header == null)
{
throw new ApplicationException("Header must be set first!");
}
#if DEBUG
// Test if all elements of the collections are features
foreach (object obj in featureCollection)
{
if (obj.GetType().IsAssignableFrom(typeof(IFeature)))
{
throw new ArgumentException("All the elements in the given collection must be " + typeof(IFeature).Name);
}
}
#endif
try
{
// Write shp and shx
var geometries = new IGeometry[featureCollection.Count];
var index = 0;
foreach (IFeature feature in featureCollection)
{
geometries[index++] = feature.Geometry;
}
ShapefileWriter.WriteGeometryCollection(_streamProviderRegistry, new GeometryCollection(geometries, _geometryFactory));
// Write dbf
_dbaseWriter.Write(Header);
foreach (IFeature feature in featureCollection)
{
var attribs = feature.Attributes;
ArrayList values = new ArrayList();
for (int i = 0; i < Header.NumFields; i++)
{
values.Add(attribs[Header.Fields[i].Name]);
}
_dbaseWriter.Write(values);
}
}
finally
{
// Close dbf writer
_dbaseWriter.Close();
}
}
public static void WriteGeometryCollection(ShapefileWriter shapefileWriter, DbaseFileWriter dbfWriter,
IGeometryCollection geometryCollection, bool writeDummyDbf = true)
{
var numShapes = geometryCollection.NumGeometries;
for (var i = 0; i < numShapes; i++)
{
shapefileWriter.Write(geometryCollection[i]);
}
if (writeDummyDbf)
{
WriteDummyDbf(dbfWriter, numShapes);
}
}
public static void WriteGeometryCollection(IStreamProviderRegistry streamProviderRegistry,
IGeometryCollection 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();
}
}
}
