private void AssertSequentialAccess(int ordinal, long dataOffset, string methodName)
{
if (ordinal < 0 || ordinal >= this._source.ColumnCount)
{
throw new ArgumentOutOfRangeException(nameof(ordinal));
}
if (this._lastColumnRead > ordinal || this._lastColumnRead == ordinal && this._lastDataOffsetRead == long.MaxValue)
{
throw new InvalidOperationException(Strings.ADP_NonSequentialColumnAccess((object)ordinal.ToString((IFormatProvider)CultureInfo.InvariantCulture), (object)(this._lastColumnRead + 1).ToString((IFormatProvider)CultureInfo.InvariantCulture)));
}
if (this._lastColumnRead == ordinal)
{
if (this._lastDataOffsetRead >= dataOffset)
{
throw new InvalidOperationException(Strings.ADP_NonSequentialChunkAccess((object)dataOffset.ToString((IFormatProvider)CultureInfo.InvariantCulture), (object)(this._lastDataOffsetRead + 1L).ToString((IFormatProvider)CultureInfo.InvariantCulture), (object)methodName));
}
}
else
{
this._lastColumnRead = ordinal;
this._lastDataOffsetRead = -1L;
}
}
/// <summary>
/// Ensures that sequential access rules are being obeyed for array offset
/// getter methods, throws the appropriate exception if not. Also ensures
/// that the last column and array offset is set appropriately.
/// </summary>
/// <param name="ordinal"> </param>
/// <param name="dataOffset"> </param>
/// <param name="methodName"> </param>
private void AssertSequentialAccess(int ordinal, long dataOffset, string methodName)
{
Debug.Assert(null != _source, "null _source?"); // we should have already called AssertReaderIsOpen.
if (ordinal < 0 ||
ordinal >= _source.ColumnCount)
{
throw new ArgumentOutOfRangeException("ordinal");
}
if (_lastColumnRead > ordinal ||
(_lastColumnRead == ordinal && _lastDataOffsetRead == long.MaxValue))
{
throw new InvalidOperationException(
Strings.ADP_NonSequentialColumnAccess(
ordinal.ToString(CultureInfo.InvariantCulture), (_lastColumnRead + 1).ToString(CultureInfo.InvariantCulture)));
}
if (_lastColumnRead == ordinal)
{
if (_lastDataOffsetRead >= dataOffset)
{
throw new InvalidOperationException(
Strings.ADP_NonSequentialChunkAccess(
dataOffset.ToString(CultureInfo.InvariantCulture),
(_lastDataOffsetRead + 1).ToString(CultureInfo.InvariantCulture), methodName));
}
// _lastDataOffsetRead will be set by GetBytes/GetChars, since we need to set it
// to the last offset that was actually read, which isn't necessarily what was
// requested.
}
else
{
// Doin' a new thang...
_lastColumnRead = ordinal;
_lastDataOffsetRead = -1;
}
}