public DataReaderWrapper(IDataReader reader, DataReaderWrapperParameters parameters, CancellationToken cancelToken)
{
_Reader = reader ?? throw new ArgumentNullException(nameof(reader));
_CancelToken = cancelToken;
InitializeColumnMap(parameters);
_CloseAction = parameters?.CloseAction;
_IgnoreReaderErrors = parameters?.IgnoreReaderErrors ?? false;
}
protected void InitializeColumnMap(DataReaderWrapperParameters parameters)
{
var columns = new List <string>();
if (parameters?.Columns != null)
{
columns.AddRange(parameters.Columns);
}
if (columns.Count <= 0)
{
for (int i = 0; i < _Reader.FieldCount; i++)
{
columns.Add(_Reader.GetName(i));
}
}
if ((parameters.SkipColumns?.Length ?? 0) > 0)
{
var dictSkip = new StringNoCaseDictionary <int>();
foreach (string skipColumn in parameters.SkipColumns)
{
if (!dictSkip.ContainsKey(skipColumn))
{
dictSkip.Add(skipColumn, 1);
}
else
{
dictSkip[skipColumn]++;
}
}
for (int i = columns.Count - 1; i >= 0; i--)
{
if (dictSkip.ContainsKey(columns[i]))
{
columns.RemoveAt(i);
}
}
}
for (int i = 0; i < columns.Count; i++)
{
string columnName = columns[i];
int ordinal = _Reader.GetOrdinal(columnName);
if (ordinal < 0)
{
throw new Exception($"Cannot find column '{columnName}'");
}
ColumnMap.Add(i, ordinal);
ColumnMapReverse.Add(ordinal, i);
}
}
public DataReaderWrapper(IDataReader reader, DataReaderWrapperParameters parameters) :
this(reader, parameters, CancellationToken.None)
{
}
