c# - What the Exception? InvalidCastException -

in legacy application, have sqldatareader. following field creates invalidcastexception bit field.

public static t getvalueornull<t>(this idatareader reader, string column) {      int ordinal;      if(!string.isnullorempty(column) && !reader.isdbnull(reader.getordinal(column)))           if(int.tryparse(reader.getordinal(column).tostring(), out ordinal))                return (t)reader.getvalue(ordinal);        return default(t); } 

what odd, (t)reader.getvalue(ordinal) assign valid type. assigns false, error still occurs. i'm not entirely sure why.

if perform gettype(); indeed show boolean type. i've checked ensure threadsafe.

the reason code fail on bit field, correlated boolean due inferred type. underlying data type wasn't bool rather bool?.

once model reflected nullable boolean, code worked intended.