/// <summary>
/// Creates a DataTable representing the information in a shape file.
/// </summary>
/// <param name="filename">The filename (minus the . and extension) to read.</param>
/// <param name="tableName">The name to give to the table.</param>
/// <param name="geometryFactory">The geometry factory to use when creating the objects.</param>
/// <param name="encoding">The encoding to use when writing data</param>
/// <returns>DataTable representing the data </returns>
public static DataTable CreateDataTable(string filename, string tableName, IGeometryFactory geometryFactory, Encoding encoding = null)
{
if (filename == null)
{
throw new ArgumentNullException("filename");
}
if (tableName == null)
{
throw new ArgumentNullException("tableName");
}
if (geometryFactory == null)
{
throw new ArgumentNullException("geometryFactory");
}
ShapefileDataReader shpfileDataReader = new ShapefileDataReader(filename, geometryFactory, encoding);
DataTable table = new DataTable(tableName);
// use ICustomTypeDescriptor to get the properies/ fields. This way we can get the
// length of the dbase char fields. Because the dbase char field is translated into a string
// property, we lost the length of the field. We need to know the length of the
// field when creating the table in the database.
IEnumerator enumerator = shpfileDataReader.GetEnumerator();
bool moreRecords = enumerator.MoveNext();
ICustomTypeDescriptor typeDescriptor = (ICustomTypeDescriptor)enumerator.Current;
foreach (PropertyDescriptor property in typeDescriptor.GetProperties())
{
ColumnStructure column = (ColumnStructure)property;
Type fieldType = column.PropertyType;
DataColumn datacolumn = new DataColumn(column.Name, fieldType);
if (fieldType == typeof(string))
{
// use MaxLength to pass the length of the field in the dbase file
datacolumn.MaxLength = column.Length;
}
table.Columns.Add(datacolumn);
}
// add the rows - need a do-while loop because we read one row in order to determine the fields
int iRecordCount = 0;
table.BeginLoadData();
object[] values = new object[shpfileDataReader.FieldCount];
do
{
iRecordCount++;
shpfileDataReader.GetValues(values);
table.LoadDataRow(values, true);
moreRecords = enumerator.MoveNext();
}while (moreRecords);
table.EndLoadData();
return(table);
}
