System.Data.ConstNode.SmallestNumeric C# (CSharp) Метод

        private object SmallestNumeric(object constant)
        {
            if (null == constant)
            {
                return 0;
            }
            else
            {
                string sval = (constant as string);
                if (null != sval)
                {
                    int i4;
                    if (int.TryParse(sval, NumberStyles.Integer, NumberFormatInfo.InvariantInfo, out i4))
                    {
                        return i4;
                    }
                    long i8;
                    if (long.TryParse(sval, NumberStyles.Integer, NumberFormatInfo.InvariantInfo, out i8))
                    {
                        return i8;
                    }
                    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.ToInt32(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.ToInt64(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;
        }
    }