C# MidpointRounding类代码示例

        public static string NumberToCurrencyText(decimal number, MidpointRounding midpointRounding = MidpointRounding.ToEven)
        {
            // Round the value just in case the decimal value is longer than two digits
            number = Decimal.Round(number, 2, midpointRounding);

            string wordNumber = String.Empty;

            // Divide the number into the whole and fractional part strings
            string[] arrNumber = number.ToString().Split('.');

            // Get the whole number text
            long wholePart = Int64.Parse(arrNumber[0]);
            string strWholePart = NumberToText(wholePart);

            // For amounts of zero dollars show 'No Dollars...' instead of 'Zero Dollars...'
            wordNumber = (wholePart == 0 ? "No" : strWholePart) + (wholePart == 1 ? " Dollar and " : " Dollars and ");

            // If the array has more than one element then there is a fractional part otherwise there isn't
            // just add 'No Cents' to the end
            if (arrNumber.Length > 1)
            {
                // If the length of the fractional element is only 1, add a 0 so that the text returned isn't,
                // 'One', 'Two', etc but 'Ten', 'Twenty', etc.
                long fractionPart = Int64.Parse((arrNumber[1].Length == 1 ? arrNumber[1] + "0" : arrNumber[1]));
                string strFarctionPart = NumberToText(fractionPart);

                wordNumber += (fractionPart == 0 ? " No" : strFarctionPart) + (fractionPart == 1 ? " Cent" : " Cents");
            }
            else
                wordNumber += "No Cents";

            return wordNumber;
        }

        public static decimal Calculate(
            Guid siteGuid,
            Guid taxZoneGuid,
            Guid taxClassGuid,
            decimal taxableTotal,
            int roundingDecimalPlaces,
            MidpointRounding roundingMode)
        {
            decimal taxTotal = 0;

            if (taxZoneGuid != Guid.Empty)
            {
                Collection<TaxRate> taxRates = TaxRate.GetTaxRates(siteGuid, taxZoneGuid);
                if (taxRates.Count > 0)
                {
                    foreach (TaxRate taxRate in taxRates)
                    {
                        if (taxClassGuid == taxRate.TaxClassGuid)
                        {
                            taxTotal += (taxRate.Rate * taxableTotal);
                            break;
                        }
                    }
                }

            }

            return taxTotal;
        }

 public static TimeSpan Round(this TimeSpan time, TimeSpan roundingInterval, MidpointRounding roundingType)
 {
     return new TimeSpan(
         Convert.ToInt64(Math.Round(
             time.Ticks / (decimal)roundingInterval.Ticks,
             roundingType
                             )) * roundingInterval.Ticks
         );
 }

 public int Round(
     double value,
     int digits,
     MidpointRounding mode
 )
 {
     int result = MathExtensions.Round(value, digits, mode);
     return result;
     // TODO: add assertions to method MathExtensionsTest.Round(Double, Int32, MidpointRounding)
 }

        public static double ConvertAmount(
            double amount, 
            CurrencyCode originalCurrencyCode, 
            CurrencyCode targetCurrencyCode,
            int decimalDigits = 2,
            MidpointRounding midPointRounding = MidpointRounding.AwayFromZero)
        {
            double originalExchangeRate = GetExchangeRate(originalCurrencyCode);
            double targetExchangeRate = GetExchangeRate(targetCurrencyCode);

            double amount_USD = amount / originalExchangeRate;
            double amount_TargetCurrency = Math.Round(amount_USD * targetExchangeRate, decimalDigits, midPointRounding);

            return amount_TargetCurrency;
        }

        public static IEnumerable<Money> SafeDivide(this Money money, int shares, MidpointRounding rounding)
        {
            if (shares <= 1)
                throw new ArgumentOutOfRangeException(nameof(shares), "Number of shares must be greater than 1");

            decimal shareAmount = Math.Round(money.Amount / shares, (int)money.Currency.DecimalDigits, rounding);
            decimal remainder = money.Amount;

            for (int i = 0; i < shares - 1; i++)
            {
                remainder -= shareAmount;
                yield return new Money(shareAmount, money.Currency);
            }

            yield return new Money(remainder, money.Currency);
        }

 [System.Security.SecuritySafeCritical]  // auto-generated
 private static unsafe double InternalRound(double value, int digits, MidpointRounding mode) {
   if (Abs(value) < doubleRoundLimit) {
       Double power10 = roundPower10Double[digits];
       value *= power10;
       if (mode == MidpointRounding.AwayFromZero) {                
           double fraction = SplitFractionDouble(&value); 
           if (Abs(fraction) >= 0.5d) {
               value += Sign(fraction);
           }
       }
       else {
           // On X86 this can be inlined to just a few instructions
           value = Round(value);
       }
       value /= power10;
   }
   return value;
 }           

	    public static double Round(double value, int decimals, MidpointRounding midpointRounding)
        {
            var roundingMode = Java.Math.RoundingMode.UNNECESSARY;
            switch (midpointRounding)
            {
                case MidpointRounding.AwayFromZero:
                    roundingMode = Java.Math.RoundingMode.HALF_UP;
                    break;

                case MidpointRounding.ToEven:
                    roundingMode = Java.Math.RoundingMode.HALF_EVEN;
                    break;
            }

            var bigDecimal = new Java.Math.BigDecimal(value);
            bigDecimal = bigDecimal.SetScale(decimals, roundingMode);

            return bigDecimal.DoubleValue();
        }

		private unsafe static double InternalRound(double value, int digits, MidpointRounding mode)
		{
			if (Math.Abs(value) < Math.doubleRoundLimit)
			{
				double num = Math.roundPower10Double[digits];
				value *= num;
				if (mode == MidpointRounding.AwayFromZero)
				{
					double value2 = Math.SplitFractionDouble(&value);
					if (Math.Abs(value2) >= 0.5)
					{
						value += (double)Math.Sign(value2);
					}
				}
				else
				{
					value = Math.Round(value);
				}
				value /= num;
			}
			return value;
		}

 /// <summary>Initializes a new instance of the <see cref="Money"/> structure in euro's.</summary>
 /// <param name="amount">The Amount of money in euro.</param>
 /// <param name="rounding">The rounding.</param>
 /// <returns>A <see cref="Money"/> structure with EUR as <see cref="Currency"/>.</returns>
 public static Money Euro(double amount, MidpointRounding rounding)
 {
     return new Money((decimal)amount, Currency.FromCode("EUR"), rounding);
 }

 public static Decimal Round(Decimal d, int decimals, MidpointRounding mode) {
   return Decimal.Round(d, decimals, mode);
 }

 public static int RoundToInt(float f, MidpointRounding mode = MidpointRounding.AwayFromZero)
 {
     return (int) Math.Round(f, mode);
 }

 /// <summary>
 /// Rounds a value to a specified number of fractional digits.
 /// </summary>
 /// <param name="value">The input value.</param>
 /// <param name="decimals">The number of decimal places in the return value.</param>
 /// <param name="mode">
 /// Specification for how to round <paramref name="value" /> if it is midway between two other numbers.
 /// </param>
 /// <returns>The output value.</returns>
 public static decimal Round(this decimal value, int decimals = 0, MidpointRounding mode = MidpointRounding.ToEven)
 {
     return Math.Round(value, decimals, mode);
 }

 public static F Round(int decimals, MidpointRounding mode) => x => Math.Round(x, decimals, mode);

 /// <summary>Initializes a new instance of the <see cref="Money"/> structure in Japanese Yens.</summary>
 /// <param name="amount">The Amount of money in euro.</param>
 /// <param name="rounding">The rounding.</param>
 /// <returns>A <see cref="Money"/> structure with JPY as <see cref="Currency"/>.</returns>
 public static Money Yen(decimal amount, MidpointRounding rounding)
 {
     return new Money(amount, Currency.FromCode("JPY"), rounding);
 }