public bool Invoke(DataRow row, DataRowVersion version)
{
if (_expr == null)
{
return(true);
}
if (row == null)
{
throw ExprException.InvokeArgument();
}
object val = _expr.Eval(row, version);
bool result;
try
{
result = ToBoolean(val);
}
catch (EvaluateException)
{
throw ExprException.FilterConversion(Expression);
}
return(result);
}