private bool TryReadSqlStringValue(SqlBuffer value, byte type, int length, Encoding encoding, bool isPlp, TdsParserStateObject stateObj)
{
switch (type)
{
case TdsEnums.SQLCHAR:
case TdsEnums.SQLBIGCHAR:
case TdsEnums.SQLVARCHAR:
case TdsEnums.SQLBIGVARCHAR:
case TdsEnums.SQLTEXT:
// If bigvarchar(max), we only read the first chunk here,
// expecting the caller to read the rest
if (encoding == null)
{
// if hitting 7.0 server, encoding will be null in metadata for columns or return values since
// 7.0 has no support for multiple code pages in data - single code page support only
encoding = _defaultEncoding;
}
string stringValue;
if (!stateObj.TryReadStringWithEncoding(length, encoding, isPlp, out stringValue))
{
return false;
}
value.SetToString(stringValue);
break;
case TdsEnums.SQLNCHAR:
case TdsEnums.SQLNVARCHAR:
case TdsEnums.SQLNTEXT:
{
String s = null;
if (isPlp)
{
char[] cc = null;
if (!TryReadPlpUnicodeChars(ref cc, 0, length >> 1, stateObj, out length))
{
return false;
}
if (length > 0)
{
s = new String(cc, 0, length);
}
else
{
s = ADP.StrEmpty;
}
}
else
{
if (!stateObj.TryReadString(length >> 1, out s))
{
return false;
}
}
value.SetToString(s);
break;
}
default:
Debug.Assert(false, "Unknown tds type for SqlString!" + type.ToString(CultureInfo.InvariantCulture));
break;
}
return true;
}