public void Init(IDataReader rdr) {
DataHelper.EnsureDataTableColumnsByReader(Result, rdr);
var tblColToIdx = new Dictionary<string, int>(Result.Columns.Count);
for (int i = 0; i < Result.Columns.Count; i++)
tblColToIdx[Result.Columns[i].ColumnName] = i;
RdrIdxToTblIdx = new int[rdr.FieldCount];
for (int i = 0; i < rdr.FieldCount; i++) {
RdrIdxToTblIdx[i] = tblColToIdx[rdr.GetName(i)];
}
Result.BeginLoadData();
}
