/// <inheritdoc />
public IDataTable GetAttributes(int startIndex, int numRows, IEnumerable <string> fieldNames)
{
var c = new AttributeCache(_layer.DataSet, numRows);
var fn = new HashSet <string>(fieldNames);
var result = new DS_DataTable();
foreach (DataColumn col in _layer.DataSet.GetColumns())
{
if (fn.Contains(col.ColumnName))
{
result.Columns.Add(col);
}
}
int i = 0;
FastDrawnState[] drawnStates = _layer.DrawnStates;
for (int fid = 0; fid < drawnStates.Length; fid++)
{
if (drawnStates[fid].Selected)
{
i++;
if (i < startIndex)
{
continue;
}
IDataRow dr = result.NewRow();
Dictionary <string, object> vals = c.RetrieveElement(fid);
foreach (KeyValuePair <string, object> pair in vals)
{
if (fn.Contains(pair.Key))
{
dr[pair.Key] = pair.Value;
}
}
result.Rows.Add(dr);
if (i > startIndex + numRows)
{
break;
}
}
}
return(result);
}
/// <inheritdoc/>
public IDataTable GetAttributes(int startIndex, int numRows, IEnumerable <string> fieldNames)
{
int count = 0;
IDataTable dt = new DS_DataTable();
List <DataColumn> dc = new List <DataColumn>();
DataColumn[] original = _featureSet.GetColumns();
var names = fieldNames as IList <string> ?? fieldNames.ToList();
foreach (DataColumn c in original)
{
if (names.Contains(c.ColumnName))
{
dc.Add(c);
}
}
dt.Columns.AddRange(dc.ToArray());
foreach (IFeature feature in Filter)
{
if (count >= startIndex && count < startIndex + numRows)
{
foreach (string name in names)
{
IDataRow dr = dt.NewRow();
dr[name] = feature.DataRow[name];
dt.Rows.Add(dr);
}
}
if (count > numRows + startIndex)
{
break;
}
count++;
}
return(dt);
}
/// <inheritdoc />
public IDataTable GetAttributes(int startIndex, int numRows)
{
int count = 0;
IDataTable dt = new DS_DataTable();
dt.Columns.AddRange(_featureSet.GetColumns());
foreach (IFeature feature in Filter)
{
if (count >= startIndex && count < startIndex + numRows)
{
dt.Rows.Add(feature.DataRow.ItemArray);
}
if (count > numRows + startIndex)
{
break;
}
count++;
}
return(dt);
}