public static ShapefileReader ReadShapefile(string path)
{
ShapefileReader shpfileReader = null;
try
{
if (ValidShapefileParts(path))
{
shpfileReader = new ShapefileReader(path, true);
Readers.Add(shpfileReader);
}
else
{
throw new Exception("Missing shapefile components at " + path);
}
}
catch (Exception e)
{
ReaderExceptions.Add(e);
shpfileReader = null;
}
finally
{
if (shpfileReader != null)
{
shpfileReader.CloseFileStream();
}
}
return(shpfileReader);
}
public static object[] ReaderToGeometryCollection(ShapefileReader shpReader)
{
if (shpReader != null && shpReader.Header != null)
{
var geometryType = shpReader.ShapeType.ToString();
switch (geometryType)
{
case "Point":
return(ReaderToGeometryCollection <Point>(shpReader, CreatePoint));
case "Multipoint":
return(ReaderToGeometryCollection <Multipoint>(shpReader, CreateMultipoint));
case "Polyline":
return(ReaderToGeometryCollection <Polyline>(shpReader, CreatePolyline));
case "Polygon":
return(ReaderToGeometryCollection <Polygon>(shpReader, CreatePolygon));
case "Null":
return(null);
default:
throw new Exception("Unknown geometry type \"" + geometryType + "\" provided for shapefile at " + shpReader.Path);
}
}
else
{
throw new NullReferenceException("Shapefile reader has not been initialized correctly or the main header file has not been read. Cannot determine geometry type.");
}
}
public static Type GetGeometryType(ShapefileReader shpReader)
{
if (shpReader != null)
{
var geometryType = shpReader.ShapeType.ToString();
switch (geometryType)
{
case "Point":
return(typeof(Point));
case "Multipoint":
return(typeof(Multipoint));
case "Polyline":
return(typeof(Polyline));
case "Polygon":
return(typeof(Polygon));
default:
return(null);
}
}
else
{
return(null);
}
}
public static ShapefileReader AddReader(string path)
{
ShapefileReader reader = new ShapefileReader(path);
ShapefileReaderManager.Readers.Add(reader);
return(reader);
}
public static ShapefileReader GetReaderForPath(string path)
{
ShapefileReader reader = null;
if (ActiveReaderPaths().Contains(path))
{
//Not actually working.
return(Readers[0]);
}
return(reader);
}
public static bool CloseReader(ShapefileReader reader)
{
if (Readers.Contains(reader))
{
reader.Dispose();
Readers.Remove(reader);
return(true);
}
else
{
return(false);
}
}
public static bool CloseReader(string path)
{
ShapefileReader reader = GetReaderForPath(path);
if (reader != null)
{
return(CloseReader(reader));
}
else
{
return(false);
}
}
private static T[] ReaderToGeometryCollection <T>(ShapefileReader shpReader, Func <byte[], T> CreateGeometry)
{
List <T> records = new List <T>();
shpReader.OpenComponentFile("shp");
while (true)
{
byte[] nextRecord = shpReader.GetNextRecord();
if (nextRecord != null)
{
records.Add(CreateGeometry(nextRecord));
}
else
{
shpReader.CloseFileStream();
return(records.ToArray());
}
}
}
public static ShapefileHeader[] GetAllMainHeadersInDirectory(string directory)
{
if (Directory.Exists(directory))
{
string[] allShpFiles = Directory.GetFiles(directory, "*.shp");
List <ShapefileHeader> headers = new List <ShapefileHeader>();
foreach (string file in allShpFiles)
{
ShapefileReader sfr = new ShapefileReader(file);
if (sfr.ReadMainHeader(false))
{
headers.Add(sfr.Header);
}
}
return(headers.ToArray());
}
else
{
return(new ShapefileHeader[] { });
}
}
