[Firebird-net-provider] Casting Text BLOB to null

[Scott M. <bl...@bl...>]

Am I missing a trick here? I'm reading from a BLOB SUB_TYPE 1 column
using the following:

FbDataReader reader = /* blah */
string text = (string)reader["LONG_TEXT"];

It's okay when there is data, but if the column happens to be NULL I get
an error ("Unable to cast object of type 'System.DBNull' to type
'System.String'"), where I'd ideally like to get a plain null.

FbDataReader.GetString doesn't work for me as it just returns ""

So I'm left with a messy lump of GetOrdinal, IsDBNull, code. There's got
to be a better way, but I'm not seeing it.

Scott