#region

using System;

#endregion

namespace CSFrameworkV5.Common
{
    /// <summary>
    ///     四舍五入类
    /// </summary>
    public class MathRound
    {
        /// <summary>
        ///     实现数据的四舍五入法
        /// </summary>
        /// <param name="v">要进行处理的数据</param>
        /// <param name="x">保留的小数位数</param>
        /// <returns>四舍五入后的结果</returns>
        public static double Round(double v, int x)
        {
            var isNegative = false;
            //如果是负数
            if (v < 0)
            {
                isNegative = true;
                v = -v;
            }

            var IValue = 1;
            for (var i = 1; i <= x; i++) IValue = IValue * 10;

            var Int = Math.Round(v * IValue + 0.5, 0);
            v = Int / IValue;

            if (isNegative) v = -v;

            return v;
        }

        /// <summary>
        ///     实现数据的进一发
        /// </summary>
        /// <param name="v">要进行处理的数据</param>
        /// <param name="x">保留的小数位数</param>
        /// <returns>进一的结果</returns>
        public double RoundIn(double v, int x)
        {
            //如果是负数
            if (v < 0) v = -v;

            var IValue = 1;
            for (var i = 1; i <= x + 1; i++) IValue = IValue * 10;

            var Int = Math.Round(v + 5.00 / IValue, x,
                MidpointRounding.AwayFromZero);

            return Int;
        }

        /// <summary>
        ///     实现数据的舍去发
        /// </summary>
        /// <param name="v">要进行处理的数据</param>
        /// <param name="x">保留的小数位数</param>
        /// <returns>舍去后的结果</returns>
        public static double RoundRej(double v, int x)
        {
            //v = 1.224;
            var part = v.ToStringEx().Split('.');
            if (part.Length == 1) return v;

            part[1] = part[1].PadRight(x, '0').Substring(0, x);
            var dd = double.Parse(part[0] + "." + part[1]);
            return dd;
        }
    }
}