System.Data.ConstNode.SmallestDecimal C# (CSharp) Method

        private object SmallestDecimal(object constant)
        {
            if (null == constant)
            {
                return 0d;
            }
            else
            {
                string sval = (constant as string);
                if (null != sval)
                {
                    decimal r12;
                    if (decimal.TryParse(sval, NumberStyles.Number, NumberFormatInfo.InvariantInfo, out r12))
                    {
                        return r12;
                    }

                    double r8;
                    if (double.TryParse(sval, NumberStyles.Float | NumberStyles.AllowThousands, NumberFormatInfo.InvariantInfo, out r8))
                    {
                        return r8;
                    }
                }
                else
                {
                    IConvertible convertible = (constant as IConvertible);
                    if (null != convertible)
                    {
                        try
                        {
                            return convertible.ToDecimal(NumberFormatInfo.InvariantInfo);
                        }
                        catch (System.ArgumentException e)
                        {
                            ExceptionBuilder.TraceExceptionWithoutRethrow(e);
                        }
                        catch (System.FormatException e)
                        {
                            ExceptionBuilder.TraceExceptionWithoutRethrow(e);
                        }
                        catch (System.InvalidCastException e)
                        {
                            ExceptionBuilder.TraceExceptionWithoutRethrow(e);
                        }
                        catch (System.OverflowException e)
                        {
                            ExceptionBuilder.TraceExceptionWithoutRethrow(e);
                        }
                        try
                        {
                            return convertible.ToDouble(NumberFormatInfo.InvariantInfo);
                        }
                        catch (System.ArgumentException e)
                        {
                            ExceptionBuilder.TraceExceptionWithoutRethrow(e);
                        }
                        catch (System.FormatException e)
                        {
                            ExceptionBuilder.TraceExceptionWithoutRethrow(e);
                        }
                        catch (System.InvalidCastException e)
                        {
                            ExceptionBuilder.TraceExceptionWithoutRethrow(e);
                        }
                        catch (System.OverflowException e)
                        {
                            ExceptionBuilder.TraceExceptionWithoutRethrow(e);
                        }
                    }
                }
            }
            return constant;
        }