/// <summary>
/// Reads all shapes in the Shapefile
/// </summary>
/// <param name="reader">The Shapefile stream</param>
/// <param name="shapeType">The type of shape to read</param>
/// <returns>A list of Geometry objects</returns>
private async Task <List <Geometry> > ReadShapeRecords(BinaryReader reader, ShapefileShapeType shapeType)
{
List <Geometry> items = null;
// Skip the end of the file header.
reader.BaseStream.Seek(100, SeekOrigin.Begin);
// Read the shapes depending on the ShapeType.
switch (shapeType)
{
case ShapefileShapeType.NullShape: // Do nothing.
break;
case ShapefileShapeType.Point:
case ShapefileShapeType.PointZ:
case ShapefileShapeType.PointM:
case ShapefileShapeType.PointZM:
items = ReadPointData(reader);
break;
case ShapefileShapeType.LineString:
case ShapefileShapeType.LineStringZ:
case ShapefileShapeType.LineStringM:
case ShapefileShapeType.LineStringZM:
items = await ReadLineStringData(reader);
break;
case ShapefileShapeType.Polygon:
case ShapefileShapeType.PolygonZ:
case ShapefileShapeType.PolygonM:
case ShapefileShapeType.PolygonZM:
items = ReadPolygonData(reader);
break;
case ShapefileShapeType.MultiPoint:
case ShapefileShapeType.MultiPointZ:
case ShapefileShapeType.MultiPointM:
case ShapefileShapeType.MultiPointZM:
items = ReadMultiPointData(reader);
break;
default: //throw an error indicating that an unsupported shape type is in the file
throw new Exception("ShapeType " + shapeType.ToString() + " is not supported.");
}
return(items);
}
