利用string.format 和cultureInfo 来进行转换

/// <summary>
        /// 输入Float格式数字，将其转换为货币表达方式
        /// </summary>
        /// <param name="ftype">货币表达类型：0=带￥的货币表达方式；1=不带￥的货币表达方式；其它=带￥的货币表达方式</param>
        /// <param name="fmoney">传入的int数字</param>
        /// <returns>返回转换的货币表达形式</returns>
        public string Rmoney(int ftype, double fmoney)
        {
            string _rmoney;
            try
            {
                switch (ftype)
                {
                    case 0:
                        _rmoney = string.Format("{0:C2}", fmoney);
                        break;

                    case 1:
                        _rmoney = string.Format("{0:N2}", fmoney);
                        break;

                    default:
                        _rmoney = string.Format("{0:C2}", fmoney);
                        break;
                }
            }
            catch
            {
                _rmoney = "";
            }

            return _rmoney;
        }

        /// <summary>
        /// 输入Float格式数字，将其转换为货币表达方式
        /// </summary>
        /// <param name="ftype">货币表达类型：0=人民币；1=港币；2=美钞；3=英镑；4=不带货币;其它=不带货币表达方式</param>
        /// <param name="fmoney">传入的int数字</param>
        /// <returns>返回转换的货币表达形式</returns>
        public static string ConvertCurrency(decimal fmoney)
        {
            CultureInfo cul = null;
            int ftype=4;
            string _rmoney=string.Empty;
            try
            {
                switch (ftype)
                {
                    case 0:
                        cul = new CultureInfo("zh-CN");//中国大陆
                        _rmoney = fmoney.ToString("c", cul);
                        break;

                    case 1:
                        cul = new CultureInfo("zh-HK");//香港
                        _rmoney = fmoney.ToString("c", cul);
                        break;
                    case 2:
                        cul = new CultureInfo("en-US");//美国
                        _rmoney = fmoney.ToString("c", cul);
                        break;
                    case 3:
                        cul = new CultureInfo("en-GB");//英国
                        _rmoney = fmoney.ToString("c", cul);
                        break;
                    case 4:
                        _rmoney = string.Format("{0:n}", fmoney);//没有货币符号
                        break;

                    default:
                        _rmoney = string.Format("{0:n}", fmoney);
                        break;
                }
            }
            catch
            {
                _rmoney = "";
            }

            return _rmoney;
        }

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