Specify a culture in string conversion explicitly

Specify a culture in string conversion explicitly

There are different methods of grouping symbols, like 1000; 1 000 and 1'000. Besides there are different digits used for numbers in different countries Chinese numerals

You can see different numbers in Control Panel -> region and language -> Formats -> additional settings -> Standart digits. (Win 7)

比如负数的格式

英文和法语中小数点和千分位的符号不一样DecimalSeparator VS GroupSeparator

Because, for example, English cultures use '.' as a decimal point, where as French cultures use ',' and the opposite to separate thousands.

Specifying a culture removes this ambiguity so that code executes identically on Windows operating systems configured for different languages, particularly if the parsed values are being committed to persistent storage.

  [Test]
        public void TestNumber()
        {
            Decimal value = -1234567890.1234789012M;
            Print("br", value);
            Print("es-BR", value);
            Print("pt-BR", value);
        }
        static void Print(string cultureName, Decimal value)
        {
            CultureInfo cultureInfo = new CultureInfo(cultureName);
            Console.WriteLine($@"{cultureInfo.Name,-8}{value.ToString("N", cultureInfo.NumberFormat)}");
        }

br -1 234 567 890,12           千分位是空格，小数点是逗号
es-BR -1,234,567,890.12    千分位是逗号，小数点是点
pt-BR -1.234.567.890,12     千分位是点，小数点是逗号

导出所有的culture以及对应的NumberFormat

 [Test]
        public void TestCultures()
        {
            var array = CultureInfo.GetCultures(CultureTypes.AllCultures);
            int i = 0;
            DataTable dataTable=new DataTable();
            dataTable.Columns.Add("Order");
            dataTable.Columns.Add("Culture");
            dataTable.Columns.Add("NumberDecimalSeparator");
            dataTable.Columns.Add("NumberGroupSeparator");
            dataTable.Columns.Add("DisplayName");
            dataTable.Columns.Add("TwoLetterISORegionName");
            foreach (var item in array)
            {
                i++;
                var row = dataTable.NewRow();
                row["Order"] = i;
                row["Culture"] = item;
                row["NumberDecimalSeparator"] = item.NumberFormat.NumberDecimalSeparator;
                row["NumberGroupSeparator"] = item.NumberFormat.NumberGroupSeparator;
                try
                {
                    RegionInfo regionInfo = new RegionInfo(item.Name);
                    row["DisplayName"] = regionInfo.DisplayName;
                    row["TwoLetterISORegionName"] = regionInfo.TwoLetterISORegionName;
                }
                catch { }
                finally
                {
                    dataTable.Rows.Add(row);
                }
            }
            ExcelConfig excelConfig = new ExcelConfig();
            excelConfig.WithHeader = true;

            var path = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), $"{DateTimeOffset.Now:yyyyMMddHHmmssfff}.xlsx");
            ExcelHelper.DataTableToExcel(path,excelConfig,dataTable);
        }